[Python-Dev] GIL behaviour under Windows

[Scott Dial]

Antoine Pitrou wrote:
> 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 don't really know how this test works, so I won't claim to understand
the results either. However, here you go:

C:\>systeminfo
OS Name:                   Microsoft Windows XP Professional
OS Version:                5.1.2600 Service Pack 3 Build 2600

C:\>c:\Python26\python.exe
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
(Intel)] on win32

C:\>start /B /HIGH c:\Python26\python.exe c:\ccbench.py
--- Throughput ---

Pi calculation (Python)

threads=1: 377 iterations/s.
threads=2: 376 ( 99 %)
threads=3: 380 ( 100 %)
threads=4: 376 ( 99 %)

regular expression (C)

threads=1: 222 iterations/s.
threads=2: 213 ( 95 %)
threads=3: 223 ( 100 %)
threads=4: 218 ( 97 %)

bz2 compression (C)

threads=1: 324 iterations/s.
threads=2: 324 ( 99 %)
threads=3: 327 ( 100 %)
threads=4: 324 ( 100 %)

--- Latency ---

Background CPU task: Pi calculation (Python)

CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 0 ms. (std dev: 0 ms.)
CPU threads=2: 0 ms. (std dev: 0 ms.)
CPU threads=3: 0 ms. (std dev: 0 ms.)
CPU threads=4: 0 ms. (std dev: 0 ms.)

Background CPU task: regular expression (C)

CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 0 ms. (std dev: 0 ms.)
CPU threads=2: 0 ms. (std dev: 0 ms.)
CPU threads=3: 0 ms. (std dev: 0 ms.)
CPU threads=4: 0 ms. (std dev: 0 ms.)

Background CPU task: bz2 compression (C)

CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 0 ms. (std dev: 0 ms.)
CPU threads=2: 0 ms. (std dev: 0 ms.)
CPU threads=3: 0 ms. (std dev: 0 ms.)
CPU threads=4: 0 ms. (std dev: 0 ms.)

-- 
Scott Dial
scott at scottdial.com
scodial at cs.indiana.edu