[Python-Dev] Point of building without threads? (original) (raw)
Antoine Pitrou solipsis at pitrou.net
Thu May 10 20:41:53 CEST 2012
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On Thu, 10 May 2012 20:23:08 +0200 Stefan Krah <stefan at bytereef.org> wrote:
Antoine Pitrou <solipsis at pitrou.net> wrote: > On Wed, 9 May 2012 11:26:29 +0200 > Stefan Krah <stefan at bytereef.org> wrote: > > Antoine Pitrou <solipsis at pitrou.net> wrote: > > > > decimal is about 12% faster without threads, because the expensive > > > > thread local context can be disabled. > > > > > > If you cached the last thread id along with the corresponding context, > > > perhaps it could speed things up in most scenarios? > > > > Nice. This reduces the speed difference to about 4%! > > Note that you don't need the actual thread id, the Python thread state > is sufficient: PyThreadStateGET should be a simply variable lookup in > release builds.
I've tried both ways now and the speed gain is roughly the same. Perhaps the interpreter as a whole is slightly faster --without-threads? That would explain the remaining speed difference of 4%.
It may be. Can you try other benchmarks?
Regards
Antoine.
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