Hello Ryan, I did not write the pgo bits, I only preserved them (without testing) when the Python recipe was rewritten from scratch (by me) in order to bring some sanity to it, and make it possible again to update it to newer versions. The people you want to talk to are Anuj Mittal and Ross Burton (cc).
Alex On Fri, 12 Jun 2020 at 23:28, Ryan Rowe <rr...@xevo.com> wrote: > Hello Alex, > > > > I’m investigating Python 3 performance issues on a Raspberry Pi Yocto > build; I appreciate any insights you can provide into the problem. > > > > In my investigation, I noticed that PGO was disabled in all cases due to a > small bug. I fixed it in a patch submitted to OE-Core (#139459 > <https://lists.openembedded.org/g/openembedded-core/message/139459>). > Even when PGO is indeed enabled, Python 3 runs significantly slower on > Yocto-compiled Python 3.8.3 than the same version compiled on Raspbian. > > > > In your patch, > 0001-Makefile.pre-use-qemu-wrapper-when-gathering-profile.patch > <http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-devtools/python/python3/0001-Makefile.pre-use-qemu-wrapper-when-gathering-profile.patch>, > I see that you override the default PROFILE_TASK, which did not > explicitly specify test suites, to a command that explicitly provides test > suites. How did you decide on these tests? The standard PGO command runs 43 > tests, while you specify 7. When I compile Python 3.8.3 on Raspbian, I see > no intersection between the 43 tests run by default and the 7 you specify. > Additionally, the default module for PROFILE is test while you use > test.regrtest. > > > > For reference, here’s the results of a simple CPU-bound test. These tests > were run on the same Raspberry Pi 4 with same SD card. > > > > python3 -m timeit -r 10 --setup ' > def fib(n): > if n < 2: > return n > > if n == 2: > return 1 > > return fib(n - 1) + fib(n - 2) > ' '[fib(n) for n in range(20)]' > > > > # Yocto Python 3.8.3 > # 10 loops, best of 10: 28.9 msec per loop > # 10 loops, best of 10: 29.3 msec per loop > # 10 loops, best of 10: 27.9 msec per loop > # 10 loops, best of 10: 30.4 msec per loop > # Average result: 31.625 msec per loop > > > > # Raspbian Python 3.8.3 > # 50 loops, best of 10: 7.73 msec per loop > # 50 loops, best of 10: 7.72 msec per loop > # 50 loops, best of 10: 7.67 msec per loop > # 50 loops, best of 10: 7.74 msec per loop > > # Average result: 7.715 msec per loop > > > > # Raspbian speedup: 4.09x > > > > Best, > > Ryan Rowe >
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#139465): https://lists.openembedded.org/g/openembedded-core/message/139465 Mute This Topic: https://lists.openembedded.org/mt/74848490/21656 Group Owner: openembedded-core+ow...@lists.openembedded.org Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
