On Jun 19, 11:59 pm, Jesse Noller <jnol...@gmail.com> wrote: > On Fri, Jun 19, 2009 at 12:50 PM, OdarR<olivier.da...@gmail.com> wrote: > > On 19 juin, 16:16, Martin von Loewis <martin.vonloe...@hpi.uni-: > >> If you know that your (C) code is thread safe on its own, you can > >> release the GIL around long-running algorithms, thus using as many > >> CPUs as you have available, in a single process. > > > what do you mean ? > > > Cpython can't benefit from multi-core without multiple processes. > > > Olivier > > Sorry, you're incorrect. I/O Bound threads do in fact, take advantage > of multiple cores.
Incorrect. They take advantage of OS threading support where another thread can run while one is blocked for I/O. That is not equal to running on multiple cores (though it actually does do that, just that cores are all not well utilized - sum(x) < 100% of one core). You wil get better performance running on single core because of the way GIL is implemented in all cases. -- http://mail.python.org/mailman/listinfo/python-list
