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Date: Wed, 29 Aug 2012 20:00:56 +0200
From: magnum <>
Subject: Re: Questions about compiling for Optimal CPU  Performance

On 29 aug 2012, at 17:55, 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.
> You're joking, aren't you? Some CPUs are still 32-bit only or have 64-bit
> capability, but disable it (such as some Intel Atoms). So when asked why,
> that is the reason I sometimes use a 32-bit operating system and cannot
> use a 64-bit OS for those specific CPUs. You can understand that I hope.
> Not sure why this would be questioned... am I missing something? An inside
> joke only related to JtR perhaps?

Sorry, I thought all Celeron was 64-bit. Is that not the case? For a 32-bit build, linux-x86-sse2i is probably best, it uses intrinsics code precompiled with icc.


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