On Nov 30, 2007 7:16 PM, Brett Cannon <[EMAIL PROTECTED]> wrote: > On Nov 30, 2007 12:02 PM, Neil Toronto <[EMAIL PROTECTED]> wrote: > > On both of my systems, using -O2 reduces execution time in pystone by 9% > > and in pybench by 8%. It's function inlining: "-O3 > > -fno-inline-functions" works just as well as "-O2". Removing "-g" has > > little effect on the result. > > > > Systems: > > - AMD Athlon 64 X2 Dual Core 4600+, 512 KB cache (desktop) > > - Intel T2300 Dual Core 1.66GHz, 512 KB cache (laptop) > > > > Both are Ubuntu 7.04, GCC 4.1.2. > > > > Does anybody else see this? > > > > It may be GCC being stupid (which has happened before) or not enough > > cache on my systems (definitely possible). If it's not one of those, I'd > > say it's because CPython core functions are already very large, and > > almost everything that ought to be inlined is already a macro. > > > > That's quite possible. Previous benchmarks by AMK have shown that > perhaps -0m (or whatever the flag is to optimize for size) sometimes > is the best solution. It has always been believed that the eval loop > is already large and manages to hit some cache sweet spot.
The flag is -Os. I suspect you will do better to limit the size of inlining rather disabling it completely. The option is -finline-limit=number. I don't know the default value or what you should try. I would be interested to hear more results though. n _______________________________________________ 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
