[Python-Dev] GIL behaviour under Windows

[John Arbash Meinel]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Antoine Pitrou wrote:
> Le mercredi 21 octobre 2009 à 12:42 -0500, John Arbash Meinel a écrit :
>> You can use time.clock() instead to get <15ms resolution. Changing all
>> instances of 'time.time' to 'time.clock' gives me this result:
> [snip]
>> --- Latency ---
>>
>> Background CPU task: Pi calculation (Python)
>>
>> CPU threads=0: 24727 ms. (std dev: 0 ms.)
>> CPU threads=1: 27930 ms. (std dev: 0 ms.)
>> CPU threads=2: 31029 ms. (std dev: 0 ms.)
>> CPU threads=3: 34170 ms. (std dev: 0 ms.)
>> CPU threads=4: 37292 ms. (std dev: 0 ms.)
> 
> Well apparently time.clock() has a per-process time reference, which
> makes it unusable for this benchmark :-(
> (the numbers above are obviously incorrect)
> 
> Regards
> 
> Antoine.

I believe that 'time.count()' is measured as seconds since the start of
the process. So yeah, I think spawning a background process will reset
this counter back to 0.

John
=:->

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Cygwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkrfTFYACgkQJdeBCYSNAAObWQCfRJsRENbcp6kuo2x1k+HvhYGZ
ftsAn2PNnNHNj6D4esNBMhlSdH4IjeMA
=1KWG
-----END PGP SIGNATURE-----