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From: Zach Saw <zach DOT saw AT gmail DOT com>
Subject: Re: App runs 8x slower on dual core machine (with test case to replicate issue)
Date: Fri, 10 Aug 2012 04:18:46 +0000 (UTC)
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Zach Saw <zach.saw <at> gmail.com> writes:

> > On Cygwin:
> > This is perl 5, version 14, subversion 2 (v5.14.2) built for 
> > cygwin-thread-multi-64int
> 
> Just out of curiousity are you running XP-32bit?
> If you are, could you try running the multithreaded test with CPU 
> affinity set to 1 (single core)?
> You should see it take just a little more time to complete vs the
> single threaded one.

Actually, you'd be running under 64-bit Windows with perl being 
compiled as native 64-bit app. In which case, could you also try
what I described above?

You should be able to set CPU affinity of the perl process by first
setting affinity of a parent process (e.g. cmd.exe). Then run perl 
from that cmd.exe. Child processes will follow the affinity.


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