On Wed, 22 Jul 2020 12:46:40 +0900 Inada Naoki <songofaca...@gmail.com> wrote: > On Wed, Jul 22, 2020 at 3:43 AM Mark Shannon <m...@hotpy.org> wrote: > > > > On 18/07/2020 9:20 am, Inada Naoki wrote: > > > It seems great improvement, but I am worrying about performance. > > > > > > Adding more attributes to the code object will increase memory usage > > > and importing time. Is there some estimation of the overhead? > > > > Zero overhead (approximately). > > We are just replacing one compressed table with another at the C level. > > The other attributes are computed. > > > > > > > > And I am worrying precise tracing blocks future advanced bytecode > > > optimization. > > > Can we omit precise tracing and line number information when > > > optimization (`-O`) is enabled? > > > > I don't think that is a good idea. > > Performing any worthwhile performance optimization requires that we can > > reason about the behavior of programs. > > Consistent behavior makes that much easier. > > Inconsistent "micro optimizations" make real optimizations harder. > > > > Cheers, > > Mark. > > > > Tracing output is included in the program behavior? > > For example, if two code block is completely equal: > > if a == 1: > very very > long > code block > elif a == 2: > very very > long > code block > > This code can be translated into like this (pseudo code): > > if a == 1: > goto block1 > if a == 2: > goto block1 > block1: > very very > long > code block > > But if we merge two equal code blocks, we can not produce precise line > numbers, can we? > Is this inconsistent microoptimization that real optimization harder? > This optimization must be prohibited in future Python?
All attempts to improve Python performance by compile-time bytecode optimizations have more or less failed (the latter was Victor's, AFAIR). Is there still interest in pursuing that avenue? Regards Antoine. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/BDLZC3SSEKUJZNHN3CW6OIDDSDTTSUTH/ Code of Conduct: http://python.org/psf/codeofconduct/
