Re: Clojure performance question
On Sunday, 2 March 2014 12:49:15 UTC+5:30, Shantanu Kumar wrote: On Sunday, 2 March 2014 05:32:00 UTC+5:30, bob wrote: Good point, Thanks a lot. Shall we improve the str fn in the core lib? From my point of view, the core fns should be performance sensitive. If string formation is the bottleneck in your app and if you can come up with a version of `str` function that works in all use-cases, then you can probably `alter-var-root` the str fn with yours as long as you own the responsibility. I noticed the following macro (ignore the reflection warnings) can help shave some nanoseconds in a large tight loop, but I leave to you to decide how much worth it really is: Just to clarify: I meant `some nanoseconds` per invocation for small string only. Overall saving would be proportional to the occurrence count and args count. Shantanu -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure performance question
I cannot agree with this...
Not at 100% at least.
String manipulations are frequent
enough to mandate some tuning
if the need is obvious.
Looks to me that this is the case here.
Other core fns went through rewrites
to improve performance.
Simplicity has nothing to do with
internal implementations.
If someone comes up with a better
implementation while providing
the same behaviours as the current
str fn, then it should make it's way
maybe in clojure.string.
fast-strings ? Whatever it may be
named.
Luc P.
Core fns should be simple, unsurprising, and general.
'Improving' str may hurt simplicity, make behavior more surprising and
unexpected, and less general unless proven otherwise.
On Sat, Mar 1, 2014 at 7:02 PM, bob wee@gmail.com wrote:
Good point, Thanks a lot.
Shall we improve the str fn in the core lib? From my point of view, the
core fns should be performance sensitive.
On Sunday, March 2, 2014 12:03:21 AM UTC+8, Shantanu Kumar wrote:
On Saturday, 1 March 2014 15:32:41 UTC+5:30, bob wrote:
Case :
clojure verison:
(time (dotimes [n 1000] (str n another word))) ;; take about
5000msec
java version
long time = System.nanoTime();
for(int i=0 ; i1000 ;i++){
String a=i+another word;
}
System.out.println(System.nanoTime()-time);
The java version take about 500 msecs, I thought it might be caused by
the str implementation which is using string builder, and it might not be
the best choice in the case of no much string to concat, and then I
replace
another word with 5 long strings as the parameter, however no surprise.
I just wonder what make the difference, or how to find the difference.
Others have added useful points to this thread. Java string concatenation
internally uses StringBuilder, so if you replace (str n another word)
with the following:
(let [sb (StringBuilder.)]
(.append sb n)
(.append sb another word)
(.toString sb))
..then the perf improves 1/4 to 1/3. Further, with the following tweak:
(let [sb (StringBuilder. 20)] ; because StringBuilder allocates only 16
chars by default on Oracle JRE
(.append sb n)
(.append sb another word)
(.toString sb))
..the perf improves from 1/3 to less than 1/2. Here we simply avoid
double allocation in StringBuilder.
Other things I made sure were:
1. I used Criterium to measure
2. I used `-server` option
3. Made sure reflection warning was on
Shantanu
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Re: Can't start repl with Leiningen
I found the problem more or less. lein repl works if I set iptables rule: *#iptables -P INPUT ACCEPT* What I don't understand is, why it worked already in the past with these rules: *#iptables -P INPUT DROP#iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT*but now it doesn't. The call to nrepl.ack/wait-for-ack in repl.clj ( https://github.com/technomancy/leiningen/blob/master/src/leiningen/repl.clj) wasn't succesfull with the stricter rules. Am Mittwoch, 26. Februar 2014 22:10:57 UTC+1 schrieb Matej Fröbe: *#apt-get update#apt-cache show openjdk-7-jrePackage: openjdk-7-jreSource: openjdk-7Version: 7u21-2.3.9-5...* So if I understand correctly (I'm more or less a Linux newbie), this means that update 21 is the version in distro's repositories. Am Mittwoch, 26. Februar 2014 21:36:39 UTC+1 schrieb Zach Oakes: Is their a reason your OpenJDK install is only on update 21? I believe the most recent is 51, though I doubt that is the problem. I also doubt it's a memory issue; I can run the REPL just fine on a netbook with 1GB of RAM running Ubuntu x64. On Wednesday, February 26, 2014 3:05:53 PM UTC-5, Matej Fröbe wrote: I only have 2GB. I tried adding -Xms1024M (and some lower and higher values) to the java command in lein script, but it didn't help. Am Mittwoch, 26. Februar 2014 19:52:49 UTC+1 schrieb Armando Blancas: I had the same problem with an old box I had around the house. Put Fedora 20 on it with a recent open jdk, but had just 1GB of memory total. I attributed the error to the lower memory since I never have that issue at work or other machines with at least 4GB. If you have more than 2GB, experiment with something like -Xms1024M or more. On Wednesday, February 26, 2014 9:28:42 AM UTC-8, Matej Fröbe wrote: Debian jessie 32-bit Am Mittwoch, 26. Februar 2014 15:50:19 UTC+1 schrieb John Gabriele: On Wednesday, February 26, 2014 3:19:43 AM UTC-5, Matej Fröbe wrote: It seems that this is independent of where I run the project. Matej, What OS (and version) are you using? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[ANN] edn-java 0.4.4 released
edn-java [1] is a parser and printer for edn [2]. This release: * Provides a pretty printer for edn data [3]. * Recognizes 'foo//' as a symbol [4]. * Provides experimental more readable, but still compact, edn printing [5]. It should be available on Maven Central within a day. [1] http://edn-java.bpsm.us [2] https://github.com/edn-format/edn [3] https://github.com/bpsm/edn-java/issues/13 [4] https://github.com/bpsm/edn-java/issues/30 [5] https://github.com/bpsm/edn-java/pull/37 // Ben -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to get sha1 of a string
(- Hello, World! .getBytes create-hash ...) Will get you the hash of the string encoded to bytes using *some random encoding*. (Whatever the platform you're currently running on defaults to.) You should explicitly choose an encoding and stick to it. I'd suggest UTF-8 since that can encode all the code points that might show up in a Java String. (- Hello, World! (.getBytes UTF-8) create-hash java.math.BigInteger.) // Ben On Sat, Mar 1, 2014 at 7:49 PM, Zach Oakes zsoa...@gmail.com wrote: You can use java.security.MessageDigest. For example: (defn create-hash [data-barray] (.digest (java.security.MessageDigest/getInstance SHA1) data-barray)) It takes and returns a byte array, but converting from/to a string is fairly straight-forward: (- Hello, World! .getBytes create-hash java.math.BigInteger. (format %x) println) On Saturday, March 1, 2014 11:26:29 AM UTC-5, action wrote: do like this: (ns clojurewerkz.support.hashing (:require [clojurewerkz.support.internal :as i]) (:import [com.google.common.hash Hashing HashFunction HashCode])) but: FileNotFoundException Could not locate clojurewerkz/support__init.class or cloju rewerkz/support.clj on classpath: clojure.lang.RT.load (RT.java:443) how to set the dependencies, or other solution？ Think you -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to get sha1 of a string
ok，think you！ 在 2014年3月2日星期日UTC+8上午12时28分25秒，JPH写道： I've had good experiences with https://github.com/xsc/pandect. You can also use Java interop like this: https://gist.github.com/prasincs/827272 JPH On 03/02/2014 12:26 AM, action wrote: do like this: (ns clojurewerkz.support.hashing (:require [clojurewerkz.support.internal :as i]) (:import [com.google.common.hash Hashing HashFunction HashCode])) but: FileNotFoundException Could not locate clojurewerkz/support__init.class or cloju rewerkz/support.clj on classpath: clojure.lang.RT.load (RT.java:443) how to set the dependencies, or other solution？ Think you -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
I want to parse the POST body twice.
I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: case statement and java constants
Created: http://dev.clojure.org/jira/browse/CLJ-1368 2014-03-01 2:58 GMT+01:00 Alex Miller a...@puredanger.com: I would appreciate a jira enhancement ticket for this. Alex -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to parse the POST body twice.
Depending on how large the input is, you could either read it all into memory (e.g. with slurp or similar), or dump it to a temporary file. - James On 2 March 2014 16:18, action actioncao2...@gmail.com wrote: I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to parse the POST body twice.
Copy the body to a byte array or file before parsing (or while parsing it the first time, if you want to save latency). Your server doesn't do this, so that it can reuse a few small buffer chunks instead of allocating the whole content-length, while streaming the body into your application. cheers 2014-03-02 17:18 GMT+01:00 action actioncao2...@gmail.com: I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: case statement and java constants
Oops, I already filed http://dev.clojure.org/jira/browse/CLJ-1367. Should probably link/mark as dupe - I don't appear to be able to do anything other than comment. Adam On Sun, Mar 2, 2014 at 4:35 PM, Herwig Hochleitner hhochleit...@gmail.comwrote: Created: http://dev.clojure.org/jira/browse/CLJ-1368 2014-03-01 2:58 GMT+01:00 Alex Miller a...@puredanger.com: I would appreciate a jira enhancement ticket for this. Alex -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Sente - Clojure(Script) + core.async + WebSockets/Ajax
Hi Peter -
I'm trying to learn Sente using the LightTable browser connected repl. I
try to evaluate the following code:
(let [{:keys [chsk ch-recv send-fn]}
(sente/make-channel-socket! http://localhost:6100/chsk; ; Note the
same URL as before
{})]
(def chsk chsk)
(def ch-chskch-recv)
(def chsk-send! send-fn))
(put! ch-chsk From client!)
From the JS console, I see repeated, failed attempts to connect the server.
The server is running and responding to other http requests.
Taking a very quick look at the source for the CLJS make-channel-socket!,
it seems that it tries to resolve the url using the CLJS chsk-url function
which, in turn, uses encore/get-window-location. Since my browser window
location is file://..., I think this is going to generate a bad url. Am I
reading the source correctly? Is there some way to make a channel socket by
providing an absolute url?
On Thursday, February 27, 2014 10:53:08 PM UTC-8, Peter Taoussanis wrote:
Quick addendum: I've had a few folks ask about various security
implementations.
So first up - as I mention in the REAME, I have had to make some changes
to the codebase for the public release so I wouldn't quite trust anything
pre-1.0 in production just yet (there's likely at least minor bugs). Having
said that, the general model has played out well in practice elsewhere.
A few specifics that have come up:
* Tools.reader's read-string is used server-side, so arbitrary code
evaluation isn't an issue.
* It _is_ possible for the server to receive malformed or hostile
requests (as it would be via any other protocol). The implementation itself
doesn't depend on the accuracy of any information provided by the client,
but the usual security measures will apply server-side for code you write:
only respond to well-formed requests, ensure users are
authenticated+authorised where appropriate, etc. Auth stuff is beyond the
scope of Sente, but it won't do anything to get in your way.
* Ring session information _is_ made available server-side for all
requests (including WebSocket requests), so the commonest session-based
auth methods basically work out-the-box.
* The client-side user-id *can* be forged, but it isn't used for anything
that's security sensitive. It's there only as an optimisation to disable
Ajax long-polling when a user clearly isn't logged in. If someone were to
fudge the id, the only negative effect would be an the creation of an
unnecessary long-polling connection that is never used (the server will
never acknowledge it).
* HTTPS works seamlessly, even for WebSockets. When the page is served
over HTTPS, Sente will work over HTTPS.
* CSRF protection is baked in, but you need to do a few things on your
end to enable it. A client-side warning will be printed when no CSRF code
is provided. Recommend checking out the example project for details (it
includes CSRF protection).
So tl;dr - there's a bit going on, but nothing that's fundamentally
different from the usual Ring security model. Auth and CSRF are the
responsibility of the app as usual, but Sente provides hooks in the
appropriate places to plug in whatever you're using.
Will try update the README later today with the info above.
Hope that helps, happy Friday! :-)
- Peter
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Re: I want to parse the POST body twice.
how to use slurp? first: (slurp body) and second reuse: (slurp body) 在 2014年3月3日星期一UTC+8上午12时44分09秒，James Reeves写道： Depending on how large the input is, you could either read it all into memory (e.g. with slurp or similar), or dump it to a temporary file. - James On 2 March 2014 16:18, action action...@gmail.com javascript: wrote: I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: case statement and java constants
Oh sorry, I should have looked at the newest issues first. I don't think the tickets are dupes, because yours calls for enabling java static fields for case constants. Mine just wants to add language stating how case can be used right now. IMO enabling case constants is at odds with current doc language about symbols aswell as not evaluating case constants, hence shoudn't be done, but I'll leave that decision to maintainers. cheers 2014-03-02 17:51 GMT+01:00 Adam Clements adam.cleme...@gmail.com: Oops, I already filed http://dev.clojure.org/jira/browse/CLJ-1367. Should probably link/mark as dupe - I don't appear to be able to do anything other than comment. Adam On Sun, Mar 2, 2014 at 4:35 PM, Herwig Hochleitner hhochleit...@gmail.com wrote: Created: http://dev.clojure.org/jira/browse/CLJ-1368 2014-03-01 2:58 GMT+01:00 Alex Miller a...@puredanger.com: I would appreciate a jira enhancement ticket for this. Alex -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to parse the POST body twice.
You can't consume an input-stream twice. You need to store the result somewhere. For example: (defn handler [request] (let [body-str (slurp (:body request))] (do-something-to body-str) (do-something-else-to body-str))) Be aware that in production you'll likely want to limit the maximum size of the stream to avoid malicious users pushing through large amounts of junk data and using up all the memory in your app. There's a class in the Apache Commons I/O called BoundedInputStream that might be of use to you. - James On 2 March 2014 17:23, action actioncao2...@gmail.com wrote: how to use slurp? first: (slurp body) and second reuse: (slurp body) 在 2014年3月3日星期一UTC+8上午12时44分09秒，James Reeves写道： Depending on how large the input is, you could either read it all into memory (e.g. with slurp or similar), or dump it to a temporary file. - James On 2 March 2014 16:18, action action...@gmail.com wrote: I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I want to parse the POST body twice.
Don't slurp twice. Slurp mutates the stream by reading bytes off of it. Also, slurping an xml stream isn't a good idea, because the xml header can change the character encoding like so ?xml version=1.0 encoding=ISO-8859-1? Try (let [bufstream (doto (java.io.ByteArrayOutputStream. content-length) (clojure.java.io/copy body bufstream)) buffer (.toByteArray bufstream)] (parse-1 (java.io.ByteArrayInputStream. buffer)) (parse-2 (java.io.ByteArrayInputStream. buffer))) This way, your parse functions that take an input stream work unchanged. Be aware, that this allocates memory in the size of the body. 2014-03-02 18:23 GMT+01:00 action actioncao2...@gmail.com: how to use slurp? first: (slurp body) and second reuse: (slurp body) 在 2014年3月3日星期一UTC+8上午12时44分09秒，James Reeves写道： Depending on how large the input is, you could either read it all into memory (e.g. with slurp or similar), or dump it to a temporary file. - James On 2 March 2014 16:18, action action...@gmail.com wrote: I want to parse the POST body twice, but in the second place: org.xml.sax.SAXParseException: Premature end of file. How should I clone the body render for the second parse? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Sente - Clojure(Script) + core.async + WebSockets/Ajax
Hi Mark, I'm trying to learn Sente using the LightTable browser connected repl. Ahh, nice. Haven't tried LightTable yet myself, but I'd think it should work okay. From the JS console, I see repeated, failed attempts to connect the server. The URL is what's tripping you up here. Is there a reason you specifically want to provide an absolute URL? At the moment `make-channel-socket!` just takes a path (like /chsk). The host and port, etc. will all be determined for you automatically. /chsk is a reasonable choice btw - it's not user-facing so doesn't need to be particularly meaningful to anyone but you. Taking a very quick look at the source for the CLJS make-channel-socket!, it seems that it tries to resolve the url using the CLJS chsk-url function which, in turn, uses encore/get-window-location. That's correct. It just grabs the host and protocol of whatever page is serving the JavaScript. HTTPS protocols will be converted to WSS, everything else goes to WS. You should be fine there, I'd think. (put! ch-chsk From client!) Note that you'll never be putting to the `ch-chsk` yourself, it's for receiving only. To send events you'll use the `chsk-send!` fn (the API is described at https://github.com/ptaoussanis/sente#now-what). I also updated the repo a couple days ago to include a working example project that you could pull into LightTable to hack on. Otherwise feel free to open a GitHub issue if you have any other questions - am happy to help. Cheers :-) - Peter -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Sente - Clojure(Script) + core.async + WebSockets/Ajax
You are probably hit by CORS, try to open webpage at the same host
http://localhost:6100/, see http://enable-cors.org/index.html
Check Network tab in Chrome dev tools.
Best regards,
Eduard
On Sun, Mar 2, 2014 at 7:16 PM, Mark markaddle...@gmail.com wrote:
Hi Peter -
I'm trying to learn Sente using the LightTable browser connected repl. I
try to evaluate the following code:
(let [{:keys [chsk ch-recv send-fn]}
(sente/make-channel-socket! http://localhost:6100/chsk; ; Note the
same URL as before
{})]
(def chsk chsk)
(def ch-chskch-recv)
(def chsk-send! send-fn))
(put! ch-chsk From client!)
From the JS console, I see repeated, failed attempts to connect the
server. The server is running and responding to other http requests.
Taking a very quick look at the source for the CLJS make-channel-socket!,
it seems that it tries to resolve the url using the CLJS chsk-url function
which, in turn, uses encore/get-window-location. Since my browser window
location is file://..., I think this is going to generate a bad url. Am I
reading the source correctly? Is there some way to make a channel socket by
providing an absolute url?
On Thursday, February 27, 2014 10:53:08 PM UTC-8, Peter Taoussanis wrote:
Quick addendum: I've had a few folks ask about various security
implementations.
So first up - as I mention in the REAME, I have had to make some changes
to the codebase for the public release so I wouldn't quite trust anything
pre-1.0 in production just yet (there's likely at least minor bugs). Having
said that, the general model has played out well in practice elsewhere.
A few specifics that have come up:
* Tools.reader's read-string is used server-side, so arbitrary code
evaluation isn't an issue.
* It _is_ possible for the server to receive malformed or hostile
requests (as it would be via any other protocol). The implementation itself
doesn't depend on the accuracy of any information provided by the client,
but the usual security measures will apply server-side for code you write:
only respond to well-formed requests, ensure users are
authenticated+authorised where appropriate, etc. Auth stuff is beyond the
scope of Sente, but it won't do anything to get in your way.
* Ring session information _is_ made available server-side for all
requests (including WebSocket requests), so the commonest session-based
auth methods basically work out-the-box.
* The client-side user-id *can* be forged, but it isn't used for
anything that's security sensitive. It's there only as an optimisation to
disable Ajax long-polling when a user clearly isn't logged in. If someone
were to fudge the id, the only negative effect would be an the creation of
an unnecessary long-polling connection that is never used (the server will
never acknowledge it).
* HTTPS works seamlessly, even for WebSockets. When the page is served
over HTTPS, Sente will work over HTTPS.
* CSRF protection is baked in, but you need to do a few things on your
end to enable it. A client-side warning will be printed when no CSRF code
is provided. Recommend checking out the example project for details (it
includes CSRF protection).
So tl;dr - there's a bit going on, but nothing that's fundamentally
different from the usual Ring security model. Auth and CSRF are the
responsibility of the app as usual, but Sente provides hooks in the
appropriate places to plug in whatever you're using.
Will try update the README later today with the info above.
Hope that helps, happy Friday! :-)
- Peter
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[ANN] Etsy API library for Clojure
Hi, Announcing an early release of a wrapper for the Etsy API in Clojure. https://github.com/danielsz/etsy-clojure-api Available from clojars.org. Please refer to the README for the details. Thank you. -- Daniel Szmulewicz -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure performance question
How are you running these tests? The correct way to benchmark such things
is via a real benchmark framework (such as criterium) then compile your
clojure app to a jar (perhaps via lein uberjar) and finally run it via a
bare java invocation: java -jar my.jar.
Lein for example sometimes uses sub-par JVM settings, trading runtime
performance for startup speed.
Timothy
On Sun, Mar 2, 2014 at 4:59 AM, Luc Prefontaine lprefonta...@softaddicts.ca
wrote:
I cannot agree with this...
Not at 100% at least.
String manipulations are frequent
enough to mandate some tuning
if the need is obvious.
Looks to me that this is the case here.
Other core fns went through rewrites
to improve performance.
Simplicity has nothing to do with
internal implementations.
If someone comes up with a better
implementation while providing
the same behaviours as the current
str fn, then it should make it's way
maybe in clojure.string.
fast-strings ? Whatever it may be
named.
Luc P.
Core fns should be simple, unsurprising, and general.
'Improving' str may hurt simplicity, make behavior more surprising and
unexpected, and less general unless proven otherwise.
On Sat, Mar 1, 2014 at 7:02 PM, bob wee@gmail.com wrote:
Good point, Thanks a lot.
Shall we improve the str fn in the core lib? From my point of view, the
core fns should be performance sensitive.
On Sunday, March 2, 2014 12:03:21 AM UTC+8, Shantanu Kumar wrote:
On Saturday, 1 March 2014 15:32:41 UTC+5:30, bob wrote:
Case :
clojure verison:
(time (dotimes [n 1000] (str n another word))) ;; take about
5000msec
java version
long time = System.nanoTime();
for(int i=0 ; i1000 ;i++){
String a=i+another word;
}
System.out.println(System.nanoTime()-time);
The java version take about 500 msecs, I thought it might be caused
by
the str implementation which is using string builder, and it might
not be
the best choice in the case of no much string to concat, and then I
replace
another word with 5 long strings as the parameter, however no
surprise.
I just wonder what make the difference, or how to find the
difference.
Others have added useful points to this thread. Java string
concatenation
internally uses StringBuilder, so if you replace (str n another
word)
with the following:
(let [sb (StringBuilder.)]
(.append sb n)
(.append sb another word)
(.toString sb))
..then the perf improves 1/4 to 1/3. Further, with the following
tweak:
(let [sb (StringBuilder. 20)] ; because StringBuilder allocates only
16
chars by default on Oracle JRE
(.append sb n)
(.append sb another word)
(.toString sb))
..the perf improves from 1/3 to less than 1/2. Here we simply avoid
double allocation in StringBuilder.
Other things I made sure were:
1. I used Criterium to measure
2. I used `-server` option
3. Made sure reflection warning was on
Shantanu
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Re: [ANN] - purnam 0.4.3 released - Javascript Language Extensions for Clojurescript
Awesome. Glad to have this complete. I had some pending pull requests I wanted to drop in. Mark On Sun, Mar 2, 2014 at 8:22 AM, zcaudate z...@caudate.me wrote: I'm also looking for collaborators as it is getting to a stage where I'm having trouble managing it by myself. if anybody is interested. Please send me a message Chris -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- E: mark.man...@gmail.com T: http://www.twitter.com/neurotic W: www.compoundtheory.com 2 Devs from Down Under Podcast http://www.2ddu.com/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure performance question
On Monday, 3 March 2014 02:18:39 UTC+5:30, tbc++ wrote:
How are you running these tests? The correct way to benchmark such
things is via a real benchmark framework (such as criterium) then compile
your clojure app to a jar (perhaps via lein uberjar) and finally run it via
a bare java invocation: java -jar my.jar.
Lein for example sometimes uses sub-par JVM settings, trading runtime
performance for startup speed.
Relevant bits from my project.clj are below:
:dependencies [[org.clojure/clojure 1.5.1]
[criterium 0.4.3]]
:global-vars {*warn-on-reflection* true
*assert* false
*unchecked-math* true}
:jvm-opts ^:replace [-server -Xmx1g]
I believe this overrides Lein's default tiered compilation setting. I
bench'ed both Java and Clojure code using Criterium.
Shantanu
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clojure lazy-seq caching?
Hi, I understand that lazy-seq caches the computed result as each element is read. However, how can is this made to be thread-safe? Andy -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: use/require/import and quoted form
Oh I see, so we are using exactly the right datatype for the purpose... thanks :o) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Sente - Clojure(Script) + core.async + WebSockets/Ajax
Yep, I was running into the two problems you pointed out: First, I needed to use a relative URL in make-channel-socket! and that necessitated delivering my HTML through http-kit rather than the shortcut of reading it from the file system using file://... Once I did that, an assertion nicely documented the use of chsk-send! (thanks for that!). One small thing that tripped me up: It seems the event id must be a namespaced keyword. I haven't thoroughly rtfm yet so if that's doc'd, bad on me. Thanks for the pointers! On Sunday, March 2, 2014 11:27:23 AM UTC-8, Peter Taoussanis wrote: Hi Mark, I'm trying to learn Sente using the LightTable browser connected repl. Ahh, nice. Haven't tried LightTable yet myself, but I'd think it should work okay. From the JS console, I see repeated, failed attempts to connect the server. The URL is what's tripping you up here. Is there a reason you specifically want to provide an absolute URL? At the moment `make-channel-socket!` just takes a path (like /chsk). The host and port, etc. will all be determined for you automatically. /chsk is a reasonable choice btw - it's not user-facing so doesn't need to be particularly meaningful to anyone but you. Taking a very quick look at the source for the CLJS make-channel-socket!, it seems that it tries to resolve the url using the CLJS chsk-url function which, in turn, uses encore/get-window-location. That's correct. It just grabs the host and protocol of whatever page is serving the JavaScript. HTTPS protocols will be converted to WSS, everything else goes to WS. You should be fine there, I'd think. (put! ch-chsk From client!) Note that you'll never be putting to the `ch-chsk` yourself, it's for receiving only. To send events you'll use the `chsk-send!` fn (the API is described at https://github.com/ptaoussanis/sente#now-what). I also updated the repo a couple days ago to include a working example project that you could pull into LightTable to hack on. Otherwise feel free to open a GitHub issue if you have any other questions - am happy to help. Cheers :-) - Peter -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: clojure lazy-seq caching?
I understand that lazy-seq caches the computed result as each element is read. However, how can is this made to be thread-safe? The caching is done within a synchronized method as each element's value is realized. There is an instance of clojure.lang.LazySeq that manages each seq element's value. The value is computed within a call to clojure.lang.LazySeq::sval which is synchronized. After the first time it's computed, the value is cached (in the sv member) and subsequent calls to sval return the cached value. https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LazySeq.java#L37 http://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html --Steve -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] - purnam 0.4.3 released - Javascript Language Extensions for Clojurescript
Looking forward to it! On 03/03/2014, at 7:49, Mark Mandel mark.man...@gmail.com wrote: Awesome. Glad to have this complete. I had some pending pull requests I wanted to drop in. Mark On Sun, Mar 2, 2014 at 8:22 AM, zcaudate z...@caudate.me wrote: I'm also looking for collaborators as it is getting to a stage where I'm having trouble managing it by myself. if anybody is interested. Please send me a message Chris -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- E: mark.man...@gmail.com T: http://www.twitter.com/neurotic W: www.compoundtheory.com 2 Devs from Down Under Podcast http://www.2ddu.com/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/vQqvs9cBB78/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure performance question
Some perspectives (as someone who has been tuning this stuff a lot, from a core.matrix standpoint in particular) On Saturday, 1 March 2014 13:02:26 UTC+8, bob wrote: Hi, Can I ask a newbie question about clojure performance? What make clojure performance slow than java?, it seems clojure has the 1/4 performance compared to java in general, according to tests, some cases it might be 1/10. the reasons I can think out are - the byte code is not efficient sometimes - the byte code might not enjoy the jvm optimization Sometimes a problem, though Clojure is not too bad at bytecode generation and the JIT will do most of the obvious optimisations for you. - the reflection This is extremely bad for performance, but luckily it is easy to avoid: - Always use *warn-on-reflection* - Eliminate every single reflection warning with type hints - the immutable data structure This is often a performance *advantage*, especially when you start dealing with concurrency and data-driven snapshot. In the few cases where it is a problem, you can always drop back to using mutable Java data structures or arrays - so this isn't ever really an issue. - the abstract interface design This doesn't actually cost that much. Interfaces on the JVM are extremely fast and very well optimised. In many cases, JIT optimisations make them just as fast as a static method call. The abstract interface like seq offers its power, but it is easy to drop in the performance trap. ISeq itself isn't too bad (it's just an interface, as above), but some of the implementations are a bit expensive. Lazy seqs for example are not so fast... and often you don't need the laziness. However most clojure.core functions produce lazy seqs by default. I wrote an eager-map replacement for map in my clojure-utils library to get around this problem And it seems to me that it is easy to write a slow clojure program, I know the efficiency of code depends on coder, you can write the code faster than java sometimes,but need to know a lot of deep thing and tricky, and clojure is not the funny clojure any more. Thanks There are also a couple of other general issues that are slightly problematic performance issues for Clojure that can make it noticeably slower than Java for a lot of typical code: 1) Dynamic var lookup - this is expensive because all var accesses need to go via a var dereference. This prevents many JVM optimisations, and if affects pretty much every non-inlined function call in regular Clojure code. Fixing this would require eliminating the var-based namespace model - something I've been experimenting with in my experimental language Kiss, which eliminates vars and uses immutable namespaces. This approach looks promising, but is a pretty radical change so not sure if it will ever get into Clojure itself. 2) Dynamic dispatch: If you look into the details, a lot of Clojure functions have an Object argument and end up doing a serious of instance? checks or other methods to achieve dynamic dispatch. This is expensive and unnecessary in many cases, since you can often prove that the argument must be of a specific type (e.g. java.lang.String). This is fixable, but would require smarter type inference in the Clojure compiler itself. Again this is something I'm experimenting with in Kiss, it might also be fixed in a future Clojure-in-Clojure compiler. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure performance question
Cool, Kiss. From my 2 cent, the solid is important to the clojure, and the core team is making any change carefully, but looks to me that the `radical` idea is important to the community and clojure as well, might that we need a branch of clojure to do some `radical` attempt and experiment, it is the clojure's incubator. On Monday, March 3, 2014 10:06:33 AM UTC+8, Mikera wrote: 2) Dynamic dispatch: If you look into the details, a lot of Clojure functions have an Object argument and end up doing a serious of instance? checks or other methods to achieve dynamic dispatch. This is expensive and unnecessary in many cases, since you can often prove that the argument must be of a specific type (e.g. java.lang.String). This is fixable, but would require smarter type inference in the Clojure compiler itself. Again this is something I'm experimenting with in Kiss, it might also be fixed in a future Clojure-in-Clojure compiler. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
New Functional Programming Job Opportunities
Here are some functional programming job opportunities that were posted recently: functional software developer at OpinionLab http://functionaljobs.com/jobs/8685-functional-software-developer-at-opinionlab Cheers, Sean Murphy FunctionalJobs.com -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [ANN] Sente - Clojure(Script) + core.async + WebSockets/Ajax
and that necessitated delivering my HTML through http-kit rather than the shortcut of reading it from the file system using file://... Yes, good catch - sorry, forgot to mention that. Once I did that, an assertion nicely documented the use of chsk-send! (thanks for that!). One small thing that tripped me up: It seems the event id must be a namespaced keyword. I haven't thoroughly rtfm yet so if that's doc'd, bad on me. It's documented but easy to miss - I'll add an extra assertion to print on malformed event ids (thanks for the feedback!). Cheers :-) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
