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Date: Wed, 1 Apr 2015 10:37:21 +0300
From: Solar Designer <>
Subject: Re: Advice on proposal: John the Ripper jumbo robustness

On Wed, Apr 01, 2015 at 02:51:59AM +0300, Alexander Cherepanov wrote:
> On 2015-03-29 14:08, Kai Zhao wrote:
> >>it might be more of a distraction from focusing the actual fuzzing jobs.
> >
> >Yes, I agree with you. It would be better to focus the actual fuzzing job.
> The first thing to do with fuzzing john is making john start fast.
> I've taken a look at it. There are two easy things here: instrumenting 
> only a fuzzed format and john.c make john ~5x faster, removing most 
> content from john.conf makes john ~7x faster. That's 35x boost.
> Solar, magnum, any other easy ways to make john start faster?

I am surprised by your reported 35x boost from those changes, so I'll
refrain from making guesses.  You've asked Kai to profile things, and
that's right.

> Kai, could you try to profile john starting process and find out where 
> most of the time is spent?


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