Perl slowness

[Shachar Shemesh]

Noam Meltzer wrote:
> the time output does looks like you have higher cpu usage for some 
> reason, so i agree with Shachar on this.
>
> you can also try to pinpoint the place the cpu is spent.
> strace and/or ltrace with the '-f -c' flags can help.
I'm not sure about ltrace, but strace will not help. Most of the time is 
spent in user space, not in the kernel.

Strace may help if the problem is time spent in another process (i.e. - 
while the main process is sleeping), but it seems Noam has already tried 
that one and failed to spot any obvious candidates.

Shachar
>
>
>
> On Tue, Sep 8, 2009 at 5:24 PM, Shachar Shemesh <shachar at shemesh.biz 
> <mailto:shachar at shemesh.biz>> wrote:
>
>     Noam Rathaus wrote:
>>     I know the time difference doesn't look too bad, but take a
>>     bigger code set:
>>
>>     Fast:
>>     real    0m1.682s
>>     user    0m1.584s
>>     sys    0m0.064s
>>
>>     Slow:
>>     real    0m16.730s
>>     user    0m9.345s
>>     sys    0m0.096s
>>
>     These times spell "CPU intensive". Does your library do anything
>     special? If you try to import a dummy library, does this still
>     happen?
>
>
>     Shachar
>
>     -- 
>     Shachar Shemesh
>     Lingnu Open Source Consulting Ltd.
>     http://www.lingnu.com
>         
>
>


-- 
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
http://www.lingnu.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.cs.huji.ac.il/pipermail/linux-il/attachments/20090908/feb21185/attachment.html>