Hi Carl Friedrich, On Wed, 26 Sep 2018 at 22:28, Carl Friedrich Bolz-Tereick <cfb...@gmx.de> wrote: > Couldn't that slowness of getattr be fixed by making the lib objects eg use > module dicts or something?
If we use the out-of-line API mode then ``lib`` is an RPython object, but if we use the in-line ABI mode then it's a pure Python object. More precisely it's a singleton instance of a newly created Python class, and the two extra instructions are reading and guard_value'ing the map. It might be possible to rewrite the whole section of pure-Python code making the ``lib`` for the in-line ABI mode, but that looks like it would be even slower on CPython. And I don't like the idea of duplicating---or even making any non-necessary changes to---this slightly-fragile-looking logic... Anyway, I'm not sure to understand how just a guard_value on the map of an object can cause a 250 ns slow-down. I'd rather have thought it would cause no measurable difference. Maybe I missed another difference. Maybe the effect is limited to microbenchmarks. Likely another mystery of modern CPUs. A bientôt, Armin. _______________________________________________ pypy-dev mailing list pypy-dev@python.org https://mail.python.org/mailman/listinfo/pypy-dev
