[Buildroot] [Bug 15832] Low performance with python3 compare to python2 on the same platform

[Buildroot] [Bug 15832] Low performance with python3 compare to python2 on the same platform

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=15832

--- Comment #1 from Vincent Fazio <vfazio@xes-inc.com> ---
What's the output of `python -m cProfile test_python.py 10000000` on each?

I do see some variances even in Docker containers but not to that degree. On an
rpi CM3 it doesn't take anywhere near the numbers you're posting below (only
8s).

One option would be to profile the python interpreter itself. 3.12 has hooks
for `perf` but they may not be representative of the situation you're seeing as
recent interpreters try to perform opcode specialization. Otherwise you may
have to build the interpreter with profiling enabled and use another external
tool to collect that data.

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[Buildroot] [Bug 15832] Low performance with python3 compare to python2 on the same platform

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=15832

--- Comment #2 from fabien.nogue@etictelecom.com ---
(In reply to Vincent Fazio from comment #1)

Thank you for your reply.
Here are the outputs of our test with the `cProfile` module:

```
# python2 -m cProfile test_python.py 10000000
         2 function calls in 18.871 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1   18.871   18.871   18.871   18.871 test_python.py:3(<module>)
        1    0.000    0.000    0.000    0.000 {method 'disable' of
'_lsprof.Profiler' objects}


# python3 -m cProfile test_python.py 10000000
         3 function calls in 53.225 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1   53.224   53.224   53.224   53.224 test_python.py:3(<module>)
        1    0.000    0.000   53.225   53.225 {built-in method builtins.exec}
        1    0.000    0.000    0.000    0.000 {method 'disable' of
'_lsprof.Profiler' objects}
```

Is the line `built-in method builtins.exec` relevant?

On the other hand, I am attempting to profile the `cpython` interpreter.
I recompiled `python3` with options `--enable-optimizations` and
`--enable-profiling`, run my test and got the `gmon.out`.
I have `no time accumulated` when I run `gprof` on the output. So far I have no
idea why the profiling output has no result. I need to investigate further.

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[Buildroot] [Bug 15832] Low performance with python3 compare to python2 on the same platform

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=15832

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yann.morin.1998@free.fr
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #3 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Thank you for your report.

The issue tracker for the Buildroot project has been moved to
the Gitlab.com issue tracker:
    https://gitlab.com/buildroot.org/buildroot/-/issues

We are taking this opportunity to close old issues in this old
tracker. If you believe your issue is still relevant, please
open one in the new issue tracker.

Thank you!

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