[Python-Dev] GIL behaviour under Windows (original) (raw)

Scott Dial scott+python-dev at scottdial.com
Wed Oct 21 14:28:48 CEST 2009

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

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