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Re: Serious performance problems (new snapshot has some performance improvement)


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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