On Wed, 13 Feb 2013 09:39:23 +1000 Nick Coghlan <ncogh...@gmail.com> wrote: > On 13 Feb 2013 07:08, "Maciej Fijalkowski" <fij...@gmail.com> wrote: > > > > Hi > > > > We recently encountered a performance issue in stdlib for pypy. It > > turned out that someone commited a performance "fix" that uses += for > > strings instead of "".join() that was there before. > > > > Now this hurts pypy (we can mitigate it to some degree though) and > > possible Jython and IronPython too. > > > > How people feel about generally not having += on long strings in > > stdlib (since the refcount = 1 thing is a hack)? > > > > What about other performance improvements in stdlib that are > > problematic for pypy or others? > > > > Personally I would like cleaner code in stdlib vs speeding up CPython. > > For the specific case of "Don't rely on the fragile refcounting hack in > CPython's string concatenation" I strongly agree. However, as a general > principle, I can't agree until speed.python.org is a going concern and we > can get a reasonable overview of any resulting performance implications.
Anybody can run the benchmark suite for himself, speed.p.o is (fortunately) not a roadblock: http://bugs.python.org/issue17170 Regards Antoine. _______________________________________________ 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
