Serious performance problems (new snapshot has some performance improvement)

[Gerrit P. Haase]

ralf.habacker@freenet.de wrote:
> Am Montag, 30. Mai 2005 22:33 schrieb Gerrit P. Haase:
> 
>>Anonymous wrote:
>>
>>
>>>My System:
>>>#Set-up:
>>>
>>>$ g++ cygspd.cc -o cygspd-basic
>>>$ g++ -O7 cygspd.cc -o cygspd-o7
>>>$ g++ -fno-exceptions cygspd.cc -o cygspd-ne
>>>$ g++ -O7 -fno-exceptions cygspd.cc -o cygspd-ne-o7
>>>$ g++ -mno-cygwin cygspd.cc -o cygspd-mingw
>>>$ g++ -O7 -mno-cygwin cygspd.cc -o cygspd-mingw-o7
>>>$ g++ -fno-exceptions -mno-cygwin cygspd.cc -o cygspd-mingw-ne
>>>$ g++ -O7 -fno-exceptions -mno-cygwin cygspd.cc -o cygspd-mingw-ne-o7
>>>
>>># cygwin.dll 1.5.17
>>
>>[...]
>>
>>>$ /bin/time -f "%E %S %U" cygspd-mingw cygspd.dat
>>>0:03.11 0.00 0.02
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-o7 cygspd.dat
>>>0:01.50 0.01 0.02
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-ne cygspd.dat
>>>0:02.60 0.00 0.02
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-ne-o7 cygspd.dat
>>>0:01.50 0.01 0.01
>>>
>>>#Snapshot DLL (No changes were made except swapping the dll.
>>
>>[...]
>>
>>>$ /bin/time -f "%E %S %U" cygspd-mingw cygspd.dat
>>>0:02.78 0.00 0.01
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-o7 cygspd.dat
>>>0:01.51 0.01 0.01
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-ne cygspd.dat
>>>0:02.52 0.00 0.02
>>>$ /bin/time -f "%E %S %U" cygspd-mingw-ne-o7 cygspd.dat
>>>0:01.45 0.00 0.01
>>
>>Interesting, why is it faster when running a binary that doesn't
>>depend on cygwin1.dll after swapping the DLL?  Some Win caching mechanism?
> 
> 
> I recognized this caching behavior with KDE/cygwin too. Under  
> http://cvs.sourceforge.net/viewcvs.py/kde-cygwin/tools/fillmem/ there is a 
> tool, which could be used to minimize this influcence by clearing this cache. 
> See the README for more informations. 

GlobalMemoryStatusEx is only available on Win2k and WinXP.


Gerrit
-- 
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