Re: ANN - [vinyasa 0.1.0] - Give your clojure workflow more flow
Thanks for sharing! Ambrose On Wed, Jan 1, 2014 at 12:56 PM, zcaudate z...@caudate.me wrote: I've done a write up of my workflow here: http://z.caudate.me/give-your-clojure-workflow-more-flow/ -- -- 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.
ANN: bidi, a URI dispatch and formation library for Clojure
I'd like to announce a new URI routing library called bidi. If you're planning to write HTTP/web applications in Clojure in 2014, chances are you'll be including hyperlinks (URIs) in your pages/views/templates. After all, this is what the web is all about. But the code that includes/generates your URIs can get tightly coupled with the code that dispatches on them (Compojure routes, etc.), this can lead to broken links if you're not careful. Having used Pedestal services in many of my systems, I'd made heavy use of the (url-for) function. But I found it difficult to extract the Pedestal routing code from the rest of the Pedestal back-end concepts. When I wanted to be able to use http-kit for another project, this prevented me from using Pedestal and I really missed the ability to form URIs - I wanted was the (url-for) function back! Like Pedestal, bidi starts with a data description of your routes - acting as the basis for both the generation of URIs and the dispatch to your handlers. However, bidi only offers URI routing and formation - nothing else - so it can be used for 'traditional' Ring web apps, http-kit, Liberator and so on. With a little work it should work well with ClojureScript too, since it is based on protocols rather than macros. You can find more about bidi, with code examples, here: https://github.com/juxt/bidi While I've been thinking about writing bidi for a long time (hoping someone else more capable than me would write it!), the actual code is very new and so all the usual disclaimers apply. However, I'd be very grateful for feedback on this new library - what you like and dislike about it, initial impressions, complaints, alternatives you know about and any questions etc.. And finally I'd like to wish everyone on this list a Happy New Year and the very best for your Clojure hacking activies in 2014. Malcolm JUXT - https://juxt.pro -- -- 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.
core.logic vectors vs lists
Given this: (defn nullo [l] (== '() l)) (defn all-uno [l] (conde [(nullo l) s#] [(fresh [f r] * (firsto l 1)* (resto l r) (all-uno r))])) why is it that (run* [q] (all-uno [1 q 1 q])) unifies q with 1 and (run* [q] (all-uno '(1 q 1 q))) doesn't? More generally, when using core.logic, when should we expect behavior to differ when using vectors vs proper lists? -- -- 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.
[Video] Generative testing in Clojure
Hi everyone, Here is an introduction to generative testing in Clojurehttp://www.youtube.com/watch?v=u0TkAw8QqrQ using simple-check. I hope newcomers to the technique/library find it useful! Cheers, James -- -- 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: core.logic vectors vs lists
Thank you for the response and for core.logic. I assumed '(a b c) was equal to (list a b c) which I now see is a wrong assumption. On Wednesday, 1 January 2014 15:57:38 UTC, Milton Silva wrote: Given this: (defn nullo [l] (== '() l)) (defn all-uno [l] (conde [(nullo l) s#] [(fresh [f r] * (firsto l 1)* (resto l r) (all-uno r))])) why is it that (run* [q] (all-uno [1 q 1 q])) unifies q with 1 and (run* [q] (all-uno '(1 q 1 q))) doesn't? More generally, when using core.logic, when should we expect behavior to differ when using vectors vs proper lists? -- -- 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.
Storing data on web server with Clojure
I recently got started with Heroku and Clojure. They provide an optional SQL database for handling data, but it is not enabled by default. I'm wondering how much sense it makes to use SQL on a Clojure environment, vs just using sequence types within the language to store data and backing them up as writes out to a file, then reading them back in when necessary? I suppose for very large data stores, this is not ideal as you'd have a lot of data in memory. I'm coming from a PHP/MySQL background and am quite new to Clojure so I don't want to shoot myself in the foot by quickly adopting old habits rather than embracing more idiomatic approaches. Any advice, or anyone actively using data in the cloud with Clojure care to comment? -- -- 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: [Video] Generative testing in Clojure
Nicely done, I've been looking for a good intro to generative testing. The real-world example at the end nicely illustrates the value of the shrinking part of the algorithm. Thanks for publishing this. On Wed, Jan 1, 2014 at 10:58 AM, James Trunk james.tr...@gmail.com wrote: Hi everyone, Here is an introduction to generative testing in Clojurehttp://www.youtube.com/watch?v=u0TkAw8QqrQ using simple-check. I hope newcomers to the technique/library find it useful! Cheers, James -- -- 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: bidi, a URI dispatch and formation library for Clojure
Hi Malcolm,
I'm working through the examples and I am getting exceptions when I try
defining multiple routes. I noticed the 1.8.0 is mentioned in the docs but
the highest version on clojars is 1.7.0. Is clojars up to date.
Stacktraces as follows
user= (def routes [/ {index.html :index
#_= articles/ {index.html :article-index
#_= article.html :article}}])
#'user/routes
user= (match-route routes /index.html)
java.lang.IllegalArgumentException: No implementation of method:
:resolve-handler of protocol: #'bidi.bidi/Matched found for class:
clojure.lang.PersistentHashMap
clojure.core/-cache-protocol-fn
core_deftype.clj: 541
bidi.bidi/eval3017/fn/G
bidi.clj: 87
bidi.bidi/match-pair
bidi.clj: 97
bidi.bidi/match-route
bidi.clj: 193
clojure.lang.RestFn.invoke
RestFn.java: 425
user$eval3329.invoke
NO_SOURCE_FILE:1
user=
clojure.lang.Compiler.evalCompiler.java: 6619
clojure.lang.Compiler.eval
Compiler.java: 6582
clojure.core/eval
core.clj: 2852
clojure.main/repl/read-eval-print/fn
main.clj: 259
clojure.main/repl/read-eval-print
main.clj: 259
clojure.main/repl/fn
main.clj: 277
clojure.main/repl
main.clj: 277
clojure.lang.RestFn.invoke
RestFn.java: 1096
clojure.tools.nrepl.middleware.interruptible-eval/evaluate/fn
interruptible_eval.clj: 56
clojure.lang.AFn.applyToHelper
AFn.java: 159
clojure.lang.AFn.applyTo
AFn.java: 151
clojure.core/apply
core.clj: 617
clojure.core/with-bindings*
core.clj: 1788
clojure.lang.RestFn.invoke
RestFn.java: 425
clojure.tools.nrepl.middleware.interruptible-eval/evaluate
interruptible_eval.clj: 41
clojure.tools.nrepl.middleware.interruptible-eval/interruptible-eval/fn/fn
interruptible_eval.clj: 171
clojure.core/comp/fn
core.clj: 2330
clojure.tools.nrepl.middleware.interruptible-eval/run-next/fn
interruptible_eval.clj: 138
clojure.lang.AFn.run
AFn.java: 24
java.util.concurrent.ThreadPoolExecutor.runWorker
ThreadPoolExecutor.java: 1110
java.util.concurrent.ThreadPoolExecutor$Worker.run
ThreadPoolExecutor.java: 603
java.lang.Thread.run
Thread.java: 722
(match-
user=
user= (path-for routes :index)
java.lang.IllegalArgumentException: No implementation of method:
:unresolve-handler of protocol: #'bidi.bidi/Matched found for class:
clojure.lang.PersistentHashMap
clojure.core/-cache-protocol-fn
core_deftype.clj: 541
bidi.bidi/eval3017/fn/G
bidi.clj: 87
bidi.bidi/unmatch-pair
bidi.clj: 149
bidi.bidi/path-for
bidi.clj: 201
clojure.lang.RestFn.invoke
RestFn.java: 425
user$eval3331.invoke
NO_SOURCE_FILE:1
clojure.lang.Compiler.eval
Compiler.java: 6619
clojure.lang.Compiler.eval
Compiler.java: 6582
clojure.core/eval
core.clj: 2852
clojure.main/repl/read-eval-print/fn
main.clj: 259
Namespaces in waiting
When I use 'lein repl' in some project context and get to the REPL prompt, there's an available but as yet not ... present ... namespace, i.e. (all-ns) won't list the namespace(s) created in the lein project directory tree. Is there some API I can use to see a list these available but not active namespaces? I'm guessing that looking at what's on the class path doesn't necessarily tell me what namespaces might be USE-able via (use 'x). -- -- 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 - [vinyasa 0.1.0] - Give your clojure workflow more flow
I've updated the lib to version 0.1.1 Also, for people having issues with the library. The minimum leiningen version required for vinyasa is 2.3.4. Please do an upgrade of leiningen before using it. -- -- 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: bidi, a URI dispatch and formation library for Clojure
HI Malcolm
Yup, that's much better. Thanks for the quick reply
Cheers
Adrian
On Wednesday, 1 January 2014 20:16:50 UTC, Malcolm Sparks wrote:
Hi Adrian,
Yes, it was the missing clojars deployment. 1.8.0 is up there now. 1.7.0
doesn't have the map representation, which I added to the existing
vector-of-vectors syntax and moved the README examples to. Please try now.
Regards,
Malcolm
On 1 January 2014 20:06, Adrian Mowat adrian...@gmail.com
javascript:wrote:
Hi Malcolm,
I'm working through the examples and I am getting exceptions when I try
defining multiple routes. I noticed the 1.8.0 is mentioned in the docs but
the highest version on clojars is 1.7.0. Is clojars up to date.
Stacktraces as follows
user= (def routes [/ {index.html :index
#_= articles/ {index.html :article-index
#_= article.html :article}}])
#'user/routes
user= (match-route routes /index.html)
java.lang.IllegalArgumentException: No implementation of method:
:resolve-handler of protocol: #'bidi.bidi/Matched found for class:
clojure.lang.PersistentHashMap
clojure.core/-cache-protocol-fn core_deftype.clj: 541
bidi.bidi/eval3017/fn/G bidi.clj: 87
bidi.bidi/match-pair bidi.clj: 97
bidi.bidi/match-route bidi.clj: 193
clojure.lang.RestFn.invoke RestFn.java: 425
user$eval3329.invoke NO_SOURCE_FILE:1
user=
clojure.lang.Compiler.evalCompiler.java: 6619
clojure.lang.Compiler.evalCompiler.java: 6582
clojure.core/eval core.clj: 2852
clojure.main/repl/read-eval-print/fn main.clj: 259
clojure.main/repl/read-eval-print main.clj: 259
clojure.main/repl/fn main.clj: 277
clojure.main/repl main.clj: 277
clojure.lang.RestFn.invoke RestFn.java: 1096
clojure.tools.nrepl.middleware.interruptible-eval/evaluate/fn
interruptible_eval.clj: 56
clojure.lang.AFn.applyToHelper AFn.java: 159
clojure.lang.AFn.applyTo AFn.java: 151
clojure.core/apply core.clj: 617
clojure.core/with-bindings* core.clj: 1788
clojure.lang.RestFn.invoke RestFn.java: 425
clojure.tools.nrepl.middleware.interruptible-eval/evaluate
interruptible_eval.clj: 41
clojure.tools.nrepl.middleware.interruptible-eval/interruptible-eval/fn/fn
interruptible_eval.clj: 171
clojure.core/comp/fn core.clj: 2330
clojure.tools.nrepl.middleware.interruptible-eval/run-next/fn
interruptible_eval.clj: 138
clojure.lang.AFn.run AFn.java: 24
java.util.concurrent.ThreadPoolExecutor.runWorker
ThreadPoolExecutor.java: 1110
java.util.concurrent.ThreadPoolExecutor$Worker.run
ThreadPoolExecutor.java: 603
java.lang.Thread.run Thread.java: 722
(match-
user=
user= (path-for routes :index)
java.lang.IllegalArgumentException: No implementation of method:
:unresolve-handler of protocol: #'bidi.bidi/Matched found for class:
clojure.lang.PersistentHashMap
clojure.core/-cache-protocol-fn core_deftype.clj: 541
bidi.bidi/eval3017/fn/G bidi.clj: 87
bidi.bidi/unmatch-pair bidi.clj: 149
bidi.bidi/path-for bidi.clj: 201
clojure.lang.RestFn.invoke RestFn.java: 425
Re: core.async - extracting code from a go block
Thanks all - I appreciate the thoughts. -- paul.butcher-msgCount++ Silverstone, Brands Hatch, Donington Park... Who says I have a one track mind? http://www.paulbutcher.com/ LinkedIn: http://www.linkedin.com/in/paulbutcher Skype: paulrabutcher On 1 Jan 2014, at 05:46, Timothy Baldridge tbaldri...@gmail.com wrote: A few other things that might help: 1) you can use (put! c val) from inside any function. Sometimes if you want to fire and forget a send, that might be the best option 2) you can wrap the code inside the sub fns inside another go. This isn't as slow as you might think 3) think about using core.async's higher order ops like map, filter, mux, pub, mix, etc. Often I've found that by rethinking the problem a bit in therms of these ideas, it's possible to simplify the go blocks a bit. Timothy On Tue, Dec 31, 2013 at 7:14 PM, Cedric Greevey cgree...@gmail.com wrote: It should work if it's inlined or a macro. It won't shrink foo's generated code size any if bar is a macro, but it will split up the source code into smaller pieces if that's all you're concerned about. On Tue, Dec 31, 2013 at 8:50 PM, Paul Butcher p...@paulbutcher.com wrote: I recently discovered that parking calls only work if they're directly contained within a go block. So this works fine: (defn foo [ch] (go (! ch))) But this: (defn bar [ch] (! ch)) (defn foo [ch] (go (bar ch))) Results in Assert failed: ! used not in (go ...) block Is there any way around this? If I have a go block that's getting too big and want to extract some portion of it into a separate function, what's the best approach? -- paul.butcher-msgCount++ Silverstone, Brands Hatch, Donington Park... Who says I have a one track mind? http://www.paulbutcher.com/ LinkedIn: http://www.linkedin.com/in/paulbutcher Skype: paulrabutcher -- -- 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. -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- -- 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.
[Job Spam] Write Clojure at Rally Software in Boulder, Colorado
Rally Software is hiring. Rally is a SAAS provider of web-based agile project-management software. Over the past couple of years, we have been writing many of our back-end services in Clojure. You should come and work here. The team I work on does infrastructure projects, dealing with things like authentication, data storage, and real-time messaging. We spend our days pairing in Emacs (sometimes remotely via tmux), solving real-world problems (like performance, scalability, and security), discussing and designing solutions, and occasionally watching clips from bad 80's movies on the projector. There are six developers on our team now, but we have more work than we can handle - that's why we need you. We are looking for experienced polygot developers. Beyond that, I won't waste your time with a laundry-list of technical requirements. As always, a link you your github can help a lot (but is not required). Rally is hiring in several locations (see the link, below), but working on an all-Clojure team currently requires relocating to beautiful Boulder Colorado, which is a great city and is no longer under water, I swear. Here is an official link - it doesn't mention Clojure yet, but does a good job of selling you on the many benefits of working here: https://www.rallydev.com/careers/open-positions Feel free to email me off-list with questions, or send me your resume and I'll get it into the right hands. - Chris Perkins chrisperkin...@gmail.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: Storing data on web server with Clojure
I'd say it's really about how you want to interact with the data. If your pattern of interaction suits a database, use one. If you just want to store / load data structures and do everything in memory, do that instead. I use MySQL and MongoDB extensively via Clojure for a complex Internet dating platform so I'm pretty comfortable using databases with Clojure. Disclosure: I maintain Clojure's java.jdbc contrib library and I'm the primary committer on CongoMongo, a Clojure wrapper for MongoDB, so I'm probably more inclined toward those solutions than other Clojurians might be :) Sean On Wed, Jan 1, 2014 at 1:07 AM, curiousGuy andrew...@gmail.com wrote: I recently got started with Heroku and Clojure. They provide an optional SQL database for handling data, but it is not enabled by default. I'm wondering how much sense it makes to use SQL on a Clojure environment, vs just using sequence types within the language to store data and backing them up as writes out to a file, then reading them back in when necessary? I suppose for very large data stores, this is not ideal as you'd have a lot of data in memory. I'm coming from a PHP/MySQL background and am quite new to Clojure so I don't want to shoot myself in the foot by quickly adopting old habits rather than embracing more idiomatic approaches. Any advice, or anyone actively using data in the cloud with Clojure care to comment? -- -- 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. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- -- 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.
Auto updating Leiningen dependencies?
Is there are a way to auto-update project.clj dependencies in Leiningen or configure them to simply use the latest stable version? I'm also finding `lein search dep` pretty useless for quickly getting a dep's latest version when it returns 39 pages for clojure itself, starting with the oldest version. gvim -- -- 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 - New podcast Functional Geekery
I am doing a new podcast Functional Geekery, with the goal to cover topics across multiple languages, Clojure included. I am announcing it here, as Clojure was the language that got me to dig deeper into functional programming. The site can be found here: http://www.functionalgeekery.com/ and the first episode is posted. I am working on getting the feed in iTunes and the Zune Music Marketplace, but it should be in those soon. If you have any suggestions or topics for the show, I would love to hear you feedback. Thanks! --Proctor -- -- 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.
Future of performant software: cores or memory?
I have watched a number of clojure talks where the concurrent programming benefits of Clojure are emphasized. People have suggested that the number of cores in computers is growing with an exponential trend. Software developers will need programming techniques (eg immutable functional programing) which allow full harnessing of this. Software that doesn't utilize the cores will not perform well and will be left behind. But I have heard counter arguments to this view of the future... 1. The number of cores isn't growing very fast. - There isn't much demand for more cores, so this growth will be very slow for most computer devices. 2. Memory performance is the key at this time. - Whereas raw CPU speed previously was growing dramatically for many years, this has never been true for memory speed. As a result, memory access accounts for a high percentage of execution time in modern software. - The key to writing performant software at this time (and for many years to come) is to concentrate primarily on good memory performance. This means... - Keep memory footprint of programs small. - Use various techniques to minimize cache misses. - I have heard claims that dramatic program performance improvements may be achieved by concentrating on these memory considerations. - It is claimed that for the next 5 or 10 years, there will be much more performance yield to be had by concentrating on memory optimizations, than to concentrate on growth in the number of CPU cores for performance. - Yes utilize the multiple cores where appropriate, but only in simple ways. More focus should be given to performant memory usage within each thread, than worrying about deeply entwined multi-threaded programming. - Languages like C/C++ allow for good memory optimizations much better than Java. And in Clojure, it sounds like it is harder again. There is a lot that I like about Clojure, but is it unsuitable for software where performance will be important into the future? Or will the increase in multi-core capabilities soon mean that memory performance limitations pale into insignificance compared with the computational gains achieved through Clojure techniques for effectively utilizing many cores? Or is it possible to improve memory performance (eg reduce cache misses) within Clojure? Thanks, Mark P. -- -- 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: Auto updating Leiningen dependencies?
Perhaps lein-ancient would be more useful, at least in identifying when there are more recent versions available? https://github.com/xsc/lein-ancient On Wed, Jan 1, 2014 at 4:28 PM, gvim gvi...@gmail.com wrote: Is there are a way to auto-update project.clj dependencies in Leiningen or configure them to simply use the latest stable version? I'm also finding `lein search dep` pretty useless for quickly getting a dep's latest version when it returns 39 pages for clojure itself, starting with the oldest version. gvim -- -- 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. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- -- 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: Future of performant software: cores or memory?
It depends on your workload and use-cases, and you could fill many textbooks with a discussion of the tradeoffs, but I can think of some rules of thumb that point in clojure's favor. The most essential metric for me to see has been Amdahl's Law: http://en.wikipedia.org/wiki/File:AmdahlsLaw.svg To summarize it, The speedup of a program using multiple processors in parallel computing is limited by the time needed for the sequential fraction of the program. My observation is that 'the program' can be replaced by 'the system'. Memory and cpu are sort of like space/time duality, but not 100% either way, since you can see with caches and latency that memory usage has time implications, and cpu performance relies on registers and things. For example, in a shared memory system, the parallelization of the cache coherence protocol of the hardware can dominate performance aspects of your software once your software's 'good enough', thus I'd argue the protocol itself becomes part of the 'sequential fraction' of the system and program and subject to Amdahl's law. When this sort of thing happens often enough, programmers write code that takes away control from this aspect of the system and does things manually, since the programmers have better knowledge of the system than the CPU or compiler ever will. Switching to a message-passing algorithm might be the way to do it in this case, manually overriding data sent between cores, accepting the overhead of data copies and such along the way. Consider core.async, I think it's a great example of a thread scheduler and set of abstractions to overcome the limitations of OS-provided threads, schedulers, the control offered by them, and the backlash against code written to them. It's useful because the scenarios it addresses are common enough now that we need to give ourselves back the control that was taken away by OS's in the first place. Core.async is implemented by thread-pools, which I can consider a subsection and delineation of a common set of resources for a specific usage, similarly it's common in game-dev and I imagine other fields to use memory-pools to offer predictable or better performance and things like instrumentation. But, I would argue that the greatest hindrance to writing the systems we want is actually programmer productivity. Taken to an extreme, why wouldn't we write our own OS's and kernels on bare-metal, in ASM or C every time instead of re-using anything? It's because the tradeoffs that are offered by reusing different subsystems are well-understood and convenient, or anything else is impractical/impossible. By picking C++ over Clojure/Java for these reasons you're effectively saying (which might be true) that the difficulty of optimization and the need for manual control is more important than all of the benefits(minus drawbacks) afforded by a higher-level system. So, it's possible to improve memory-locality in clojure and java, people do it all the time. The java memory model is not a giant leap away from x86/64 and there are ways to avoid being subject to the garbage collector if you want it. This blog is a great resource: http://mechanical-sympathy.blogspot.com/ I think clojure's value-add in the big-picture of performance and parallelism is effective high-level coding, at-least-as-good-as-java low-level coding, and the ease of traversing those abstraction levels in a unified way. By default, you're getting immutable and functional code and the implications of clojure's relative ease/difficulty tradeoffs. On Wed, Jan 1, 2014 at 8:59 PM, Mark P pierh...@gmail.com wrote: I have watched a number of clojure talks where the concurrent programming benefits of Clojure are emphasized. People have suggested that the number of cores in computers is growing with an exponential trend. Software developers will need programming techniques (eg immutable functional programing) which allow full harnessing of this. Software that doesn't utilize the cores will not perform well and will be left behind. But I have heard counter arguments to this view of the future... 1. The number of cores isn't growing very fast. - There isn't much demand for more cores, so this growth will be very slow for most computer devices. 2. Memory performance is the key at this time. - Whereas raw CPU speed previously was growing dramatically for many years, this has never been true for memory speed. As a result, memory access accounts for a high percentage of execution time in modern software. - The key to writing performant software at this time (and for many years to come) is to concentrate primarily on good memory performance. This means... - Keep memory footprint of programs small. - Use various techniques to minimize cache misses. - I have heard claims that dramatic program performance improvements may be achieved by concentrating on these memory
Re: Auto updating Leiningen dependencies?
On 02/01/2014 02:31, Sean Corfield wrote: Perhaps lein-ancient would be more useful, at least in identifying when there are more recent versions available? https://github.com/xsc/lein-ancient Perfect. Thanks. gvim -- -- 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 - New podcast Functional Geekery
Looks great! Please post here when the feed is available in iTunes. -- -- 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.
