john-users - Questions about compiling for Optimal CPU Performance

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Date: Wed, 29 Aug 2012 08:27:21 -0400 (EDT)
From: "Brad Tilley" <brad@...ystems.com>
To: john-users@...ts.openwall.com
Subject: Questions about compiling for Optimal CPU Performance

Hello John Users,

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? 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?

Just curious, perhaps this is documented someplace on the wiki and I
missed it.

Thanks,

Brad