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

Gregory P. Smith greg at krypto.org
Tue Aug 25 18:48:23 CEST 2015

On Mon, Aug 24, 2015, 11:19 PM 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_multiprocessing"
> In general if a test is unreliable or takes an extremely long time,
> it for your sanity.  (i'd also kick out test_subprocess on 2.7; we
> 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?


Nick Coghlan   |   ncoghlan@ <ncoghlan at gmail.com>gmail.com
<ncoghlan at gmail.com>   |   Brisbane, Australia

Agreed. Also, printing a message out at the end of a default make all build
suggesting people use make production for additional performance instead
might help advertise it.

make install could possibly depend on make production as well?
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