Re: [Speed] External sources of noise changing call_simple "performance"
On Tue, 17 May 2016 23:11:50 +0200 Victor Stinner <victor.stinner@gmail.com> wrote:
Hi,
I'm still (!) investigating the reasons why the benchmark call_simple (ok, let's be honest: the *micro*benchmark) gets different results for unknown reasons.
Try to define MCACHE_STATS in Objects/typeobject.c and observe the statistics from run to run. It might give some hints.
Regards
Antoine.
2016-05-30 10:14 GMT+02:00 Antoine Pitrou <solipsis@pitrou.net>:
I'm still (!) investigating the reasons why the benchmark call_simple (ok, let's be honest: the *micro*benchmark) gets different results for unknown reasons.
Try to define MCACHE_STATS in Objects/typeobject.c and observe the statistics from run to run. It might give some hints.
call_simple only uses regular functions, not methods, so the type cache should not have any effect on it. No?
I already noticed that the exact layout of items in globals() dict matters. Depending on the PYTHONHASHSEED, you get or not hash collision, the effect is visible on such microbenchmark.
Victor
participants (2)
-
Antoine Pitrou -
Victor Stinner