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Date: Wed, 29 Aug 2012 17:09:28 +0200
From: magnum <>
Subject: Re: Questions about compiling for Optimal CPU Performance

On 29 aug 2012, at 14:27, Brad Tilley <> 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.


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