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Date: Wed, 26 Sep 2012 18:58:55 +0200
From: magnum <>
Subject: Re: choosing code optimisations

On 26 Sep, 2012, at 13:45 , Tavis Ormandy <> wrote:

> Hey, just in case anybody else wants to try it with their formats, here is a
> quick note on finding low hanging performance wins for gcc. I've been using the
> attached script to benchmark different options, it turns out

That's curious. I'll play a little with it. How many of those are there? Ideally I guess you'd want to test combinations of two or more of these too, but that might end up in a truckload of combinations.

> $ ../run/john --test --format=nt
> Benchmarking: NT MD4 [128/128 X2 SSE2-16]... DONE
> Raw:    37253K c/s real, 37253K c/s virtual
> $ bash ~/ linux-x86-64-native nt2_fmt_plug.c nt | sort -g | tail

Not sure if that was just some kind of cosmetic error in your mail but just FYI, NT (source file NT_fmt_plug.c) is one thing, and nt2 (source file nt2_fmt_plug.c) are completely different implementations of the same format. With today's naming the latter would be called nt-ng I suppose.


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