Date: Wed, 29 Aug 2012 17:09:28 +0200 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Subject: Re: Questions about compiling for Optimal CPU Performance On 29 aug 2012, at 14:27, Brad Tilley <brad@...ystems.com> wrote: > My older Intel Celeron CPU lists sse, sse2 and sse3 as supported in > /proc/cpuinfo, should I make-x86-sse2 or make-x86-native when compiling > jumbo-6? Or does the difference really matter? You should probably use linux-x86-64i. If you run a 32-bit OS, you should really ask yourself why. > Also, the Makefile has two > possibilities for OpenMP... > > 1. -fopenmp > 2. -fopenmp -msse2 > > Which one should be uncommented for optimal performance when the CPU lists > multiple sse implementations. For example, should a CPU support sse4, > would I be limiting performance if I opted for OpenMP with -msse2, or not? Some 32-bit builds need the latter. For a 64-bit build they produce the same result. magnum
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