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Date: Wed, 16 Sep 2015 22:40:45 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: fast hash processing bottlenecks (was: ldr_split_line() performance regression)

On Wed, Sep 16, 2015 at 10:31:35PM +0300, Solar Designer wrote:
> The potential speed for the current raw-md5 code on this machine is:
> 
> Benchmarking: Raw-MD5 [MD5 128/128 SSE4.1 4x3]... DONE
> Raw:    21811K c/s real, 21811K c/s virtual
> 
> per core.  But we don't reach anywhere near it with wordlist mode.
> We do reach 21M+ per core with --fork=8 e.g. in mask mode.  20M for
> incremental mode locked to length 8.  Also, 19.7M for wordlist+mask
> (tested with -mask='?w?a?a').  But not for wordlist+rules.

I've just tried -mask='?w?a' instead of -ru=best64 on the 29M hashes.
It ran for about the same 47 seconds, but tested ~1.5x more passwords
(equivalent to 95 rules, rather than 64).  The per core c/s rate was
around 7M, up from around 4.5M for rules (also when running the 29M).

I think ~1.5x for this testcase is roughly the speedup we can expect
from implementing a "rules first" mode.  (And the speedup would be
greater when running against few hashes.)

Alexander

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