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[Python-Dev] Profile Guided Optimization active by-default

Brett Cannon brett at python.org
Tue Aug 25 17:59:23 CEST 2015 
On Mon, 24 Aug 2015 at 23:19 Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 25 August 2015 at 05:52, Gregory P. Smith <greg at krypto.org> wrote:
> > What we tested and decided to use on our own builds after benchmarking at
> > work was to build with:
> >
> > make profile-opt PROFILE_TASK="-m test.regrtest -w -uall,-audio -x
> test_gdb
> > test_multiprocessing"
> >
> > In general if a test is unreliable or takes an extremely long time,
> exclude
> > it for your sanity.  (i'd also kick out test_subprocess on 2.7; we
> replaced
> > subprocess with subprocess32 in our build so that wasn't an issue)
>
> Having the "production ready" make target be "make profile-opt"
> doesn't strike me as the most intuitive thing in the world.
>
> I agree we want the "./configure && make" sequence to be oriented
> towards local development builds rather than highly optimised
> production ones, so perhaps we could provide a "make production"
> target that enables PGO with an appropriate training set from
> regrtest, and also complains if "--with-pydebug" is configured?
>

That's an interesting idea for a make target. It might help get the
visibility of PGO builds higher as well.
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