Wow. Can you possibly be more negative? 2009/4/2 Raymond Hettinger <pyt...@rcn.com>: > The measurements are just a distractor. We all already know that the hook > is being added to a critical path. Everyone will pay a cost for a feature > that few people will use. This is a really bad idea. It is not part of a > thorough, thought-out framework of container hooks (something that would > need a PEP at the very least). The case for how it helps us is somewhat > thin. The case for DTrace hooks was much stronger. > > If something does go in, it should be #ifdef'd out by default. But then, I > don't think it should go in at all. > > > Raymond > > > > > On Thu, Apr 2, 2009 at 04:16, John Ehresman <j...@wingware.com> wrote: >> >> Collin Winter wrote: >>> >>> Have you measured the impact on performance? >> >> I've tried to test using pystone, but am seeing more differences between >> runs than there is between python w/ the patch and w/o when there is no hook >> installed. The highest pystone is actually from the binary w/ the patch, >> which I don't really believe unless it's some low level code generation >> affect. The cost is one test of a global variable and then a switch to the >> branch that doesn't call the hooks. >> >> I'd be happy to try to come up with better numbers next week after I get >> home from pycon. > > Pystone is pretty much a useless benchmark. If it measures anything, it's > the speed of the bytecode dispatcher (and it doesn't measure it particularly > well.) PyBench isn't any better, in my experience. Collin has collected a > set of reasonable benchmarks for Unladen Swallow, but they still leave a lot > to be desired. From the discussions at the VM and Language summits before > PyCon, I don't think anyone else has better benchmarks, though, so I would > suggest using Unladen Swallow's: > http://code.google.com/p/unladen-swallow/wiki/Benchmarks > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > >
-- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
