Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Tue, 15 Sep 2015 21:46:28 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Judy array

On Tue, Sep 15, 2015 at 09:41:32PM +0300, Solar Designer wrote:
> The post-loading time was only 33 to 36 seconds (it varied a bit across
> the 8 processes), which I think is close to Fred's.  But the loading is
> slower.  In fact, there's a delay of a few seconds between the "Loaded"
> line and the start of cracking - what's happening there?  Reading of the
> wordlist?  But IIRC I saw similar delay at that point even with mmap.

Most of this weird delay (4 seconds maybe) is between these two lines:

Loaded 29012258 password hashes with no different salts (Raw-MD5 [MD5 128/128 SSE4.1 4x3])

and:

Node numbers 1-8 of 8 (fork)

whereas the delay between the "Node" line above and:

Each node loaded the whole wordfile to memory

is maybe only 1 second or less (the wordlist file is likely already
cached in RAM from previous invocations).

BTW, got even better time on a second invocation:

real    1m1.727s
user    4m48.066s
sys     0m22.143s

Still same 2x E5420 machine.

Alexander

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