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. Regards, Nick. > Typically that also helps pypy so I'm not unbiased. > > Cheers, > fijal > _______________________________________________ > 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/ncoghlan%40gmail.com
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