On Sat, 21 Jul 2012 11:45:21 +0100 Michael Foord <fuzzy...@voidspace.org.uk> wrote: > > On 20 Jul 2012, at 17:50, Maciej Fijalkowski wrote: > > > On Fri, Jul 20, 2012 at 2:55 PM, Michael Foord <fuzzy...@voidspace.org.uk> > > wrote: > > > > On 17 Jul 2012, at 23:04, mar...@v.loewis.de wrote: > > > > >> [snip...] > > > > > >> I would like to use a JIT to generate specialized functions for a > > >> combinaison of arguments types. > > > > > > I think history has moved past specializing JITs. Tracing JITs are the > > > status quo; they provide specialization as a side effect. > > > > > > > Mozilla implemented a method-JIT (compile whole methods) on top of their > > tracing JIT because a tracing JIT only optimises part of your code (only in > > loops and only if executed more times than the threshold) and there are > > further performance improvements to be had. So tracing JITs are not the > > *whole* of the state of the art. > > > > Michael > > > > I'm sorry michael but you're like a 100th person I have to explain this to. > > The pure reason that mozilla did not make a tracing JIT work does not mean > > the entire approach is horribly doomed as many people would like to assume. > > The reasons are multiple, but a lot of them are connected to poor > > engineering (for example the part inherited from adobe is notoriously bad, > > have a look if you want). > > > Well, that isn't how they describe it. If it is the case, it's *still* > interesting > that rather than putting their efforts into improving the tracing JIT they > put them > into adding a method-JIT *as well*.
Honestly I'm not sure that's a very interesting discussion. First, Javascript performance is not based on the same prorities as Python performance: for the former, startup time is key. Second, whether method-based or tracing-based, a well-written JIT would certainly bring significant performance improvements over a bytecode interpreter anyway. Regards Antoine. -- Software development and contracting: http://pro.pitrou.net _______________________________________________ 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
