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Message-ID: <429A19EC.9080905@familiehaase.de>
Date: Sun, 29 May 2005 21:37:16 +0200
From: "Gerrit P. Haase" <gerrit AT familiehaase DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: Serious performance problems (new snapshot has some performance  improvement)
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Christopher Faylor wrote:

> On Sat, May 28, 2005 at 11:05:23PM -0400, Christopher Faylor wrote:
> 
>>On Sat, May 28, 2005 at 08:18:46PM -0400, Christopher Faylor wrote:
>>
>>>I have an idea about how to work around this problem but I have to think
>>>about how dangerous it might be.  Basically removing the signal handling
>>>wrapper around pthread_getspecific and pthread_setspecific.  That may
>>>work ok but I have to think about worst case scenarios.
>>
>>I've semi-convinced myself that pthread_[gs]etspecific do not need signal
>>protection so I've released a snapshot which turns it off:
>>
>>http://cygwin.com/snapshots/
>>
>>This version is about 2.7 times faster than cygwin 1.5.17 but it is still
>>not as fast as mingw.  I don't think we're going to hit mingw performance
>>since there are still cygwin overhead issues involved.
>>
>>AFAIK, this is only going to provide a speedup for this specific case.
>>I don't think a general cygwin user is going to notice any improvement.
> 
> 
> Gerrit, if you have a chance could you confirm or deny if this change has
> any effect for you?

I just changed the DLL, application is not recompiled:

Snapshot DLL:

$ C:\cygwin\bin\time cygspd.exe cygspd.dat
94.04user 0.61system 1:41.69elapsed 93%CPU
  (0avgtext+0avgdata 10560maxresident)k
0inputs+0outputs (667major+0minor)pagefaults 0swaps

Release 1.5.17 DLL:

$ C:\cygwin\bin\time cygspd.exe cygspd.dat
264.50user 0.75system 4:48.08elapsed 92%CPU
  (0avgtext+0avgdata 10560maxresident)k
0inputs+0outputs (667major+0minor)pagefaults 0swaps


It is about 2,8514851485148514851485148514851 times faster at my
workstation.


Gerrit
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