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[Python-Dev] GIL behaviour under Windows

Kristján Valur Jónsson kristjan at ccpgames.com
Wed Oct 21 15:24:15 CEST 2009 
> -----Original Message-----
> Could you try ccbench (*) under Windows? The only Windows system I have
> here is
> a qemu virtual machine and it wouldn't be very realistic to do
> concurrency
> measurements on it.
> 
> (*) http://svn.python.org/view/sandbox/trunk/ccbench/

I´ve run it twice on my dual core machine.  It hangs every time, but not in the same place:
D:\pydev\python\trunk\PCbuild>python.exe \tmp\ccbench.py
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
--- Throughput ---

Pi calculation (Python)

threads=1: 514 iterations/s.
threads=2: 403 ( 78 %)
threads=3: 392 ( 76 %)
threads=4: 364 ( 70 %)

regular expression (C)

threads=1: 443 iterations/s.
threads=2: 474 ( 106 %)
threads=3: 461 ( 104 %)
threads=4: 466 ( 105 %)

SHA1 hashing (C)

threads=1: 983 iterations/s.
threads=2: 1026 ( 104 %)
^C
D:\pydev\python\trunk\PCbuild>python.exe \tmp\ccbench.py
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
malloc 262144 gave 262144, diff 0
--- Throughput ---

Pi calculation (Python)

threads=1: 506 iterations/s.
threads=2: 405 ( 80 %)
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