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Date: Tue, 15 Sep 2015 18:24:40 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Judy array

On Tue, Sep 15, 2015 at 09:53:52AM +0200, magnum wrote:
> On 2015-09-15 09:29, Frank Dittrich wrote:
> >Even with fast salted hashes, it is a problem when you have may be 4
> >instances of john running, each with about 2 million hashes, and
> >cracking many passwords.
> 
> You are using the default SALT_HASH_LOG of 12, right? You load a 
> thousand times more salts than that number is really good for. Please 
> try bumping it to 22 for the case of 2 million hashes. This will speed 
> up things significantly, not just pot sync.
> 
> In fact we might want to bump that default a bit (at least in Jumbo). I 
> think we can't make it variable, that would hurt performance.

We should do something about SALT_HASH_LOG next, yes.  IIRC, the reason
why I kept it at 12 was specifically not to waste any memory when
cracking descrypt hashes.  Perhaps we need to use a higher default now.

Alexander

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