On Sat, Nov 19, 2016 at 02:32:26AM +0100, Victor Stinner wrote:
Hi,
I'm happy because I just finished an article putting the most important things that I learnt this year on the most silly issue with Python performance: code placement.
https://haypo.github.io/analysis-python-performance-issue.html
I explain how to debug such issue and my attempt to fix it in CPython.
I hate code placement issues :-) I hate performance slowdowns caused by random unrelated changes...
Victor
Thanks *a lot* victor for this great article. You not only very accurately describe the method you used to track the performance bug, but also give very convincing results.
I still wonder what the conclusion should be:
(this) Micro benchmarks are not relevant at all, they are sensible to minor factors that are not relevant to bigger applications
There is a generally good code layout that favors most applications? Maybe some core function from the interpreter ? Why does PGO fails to ``find'' them?
Serge