Re: Clojure.org

2017-09-23 Thread Alan Moore 
Thanks for the feedback! Yeggi’s post was written a long time ago and the 
site/mailing list have undergone quite a few changes since then. Hopefully it 
is better now, sometimes it is hard for those of us who have been around awhile 
to see rough edges.

Alan

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Re: When does .getThreadCpuTime return nil?

2017-09-23 Thread lawrence . krubner 

Thanks for the answer. I am surprised because I used this code for years 
without ever seeing that error. I'm trying to imagine what I did 
differently this one time. I've added error detection, we'll see if it 
happens again. 



On Friday, September 22, 2017 at 7:34:49 PM UTC-4, Neil Okamoto wrote:
>
>
> Maybe it's because you attempted method invocation via reflection but the 
> object is nil. So for example if (threads) returns a list containing nils, 
> then calling (.getId t) or (.getName t) would probably throw a null pointer 
> exception. I'm not sure it's possible for 
> (ManagementFactory/getThreadMXBean) to return nil, but if it does then 
> (.getThreadCpuTime mgr ...) would similarly fail.
>
> So best guess is, take a look at the implementation of "threads".
>
>
>
>
> On Friday, September 22, 2017 at 1:37:04 PM UTC-7, lawrence...@gmail.com 
> wrote:
>>
>> I've been using this code for years. I copy and pasted it from someone 
>> else on this group, someone much smarter than I am. I have never seen an 
>> error from this code. Now suddenly I get a null pointer exception at the 
>> last line of this code: 
>>
>> (ns denormalize_mysql_to_mongodb.monitoring
>>   (:import
>>java.lang.management.ManagementFactory)
>>   (:require [clojure.string :as st]))
>>
>>
>> (defn thread-top
>>   "Return a seq of threads sorted by their total userland CPU usage."
>>   []
>>   (let [mgr (ManagementFactory/getThreadMXBean)
>> cpu-times (map (fn [t]
>>  [(.getThreadCpuTime mgr (.getId t)) t])
>> (threads))]
>> (map
>>   (fn [[cpu t]] [cpu (.getName t) (.getId t) t])
>>   (reverse (sort-by first cpu-times)
>>
>> This error is thrown at startup. I don't know much about ThreadMXBean. 
>> Can anyone give me a clue why any of this would be nil? 
>>
>>
>>
>>
>>
>>

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Re: Is it wrong that I'm thinking about this?

2017-09-23 Thread Jeaye 
Last I checked, on our Clojure back-end, instrumentation was taking up 2% of 
our total test running time. This is with jdbc's instrumentation disabled 
though; I think it's significantly slower due to its extensive usage of s/or 
s/alt and spec regexes. Our specs are almost entirely s/keys and clojure.core 
predicates.

Our fn spec coverage is 47% on the back-end. So the performance impact of 
instrumentation really hasn't been a concern.

On Fri, Sep 22, 2017 at 10:18:52PM -0700, Didier wrote:
> > The goal is to add the macro to orchestra, as a tool to help encourage 
> > spec'ing all functions.
> 
> That would be great. My macro for now was also not supporting all defn cases 
> yet. And it automatically instruments the fn with orchestra. So if orchestra 
> had a more complete one defacto, I wouldn't need one.
> 
> For performance, I've been thinking that caching validation (with some 
> configurable cache bounds), or having sample based validation, so validating 
> only a percentage of calls, and maybe even having the sampling rate 
> controlled by execution time metrics, or cpu metrics or call rates, etc. 
> would be interesting possibilities. So in prod, you could tweek the 
> validation to only get as much of it as you can afford.
> 
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Re: [ANN] Instaparse 1.4.8

2017-09-23 Thread Colin Yates 
Thanks Mark, Instaparse is invaluable for us.

Sent from my iPhone

> On 23 Sep 2017, at 06:18, Mark Engelberg  wrote:
> 
> Instaparse 1.4.8 has been updated to support a breaking change that was made 
> in Clojurescript 1.9.854, relating to the reader.  The change has been tested 
> with Clojurescript versions 1.7.28 and up.
> 
> No functionality changes, and this update should not matter for Clojure users.
> Instaparse supports Clojure 1.5.1 and up.
> 
> Thanks to pkpkpk for providing the pull request with the necessary fix:
> https://github.com/Engelberg/instaparse/pull/169
> 
> (Please note that Clojurescript does not currently work with Clojure 
> 1.9-alpha20 or newer: https://dev.clojure.org/jira/browse/CLJS-2352)
> 
> --Mark
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