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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