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Date: Tue, 15 Sep 2015 09:53:52 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Judy array

On 2015-09-15 09:29, Frank Dittrich wrote:
> On 09/15/2015 03:03 AM, Solar Designer wrote:
>> magnum - testing this stuff, I see that pot sync is a major bottleneck.
>> Since this is your feature, you might want to benchmark and optimize it
>> some more, or/and maybe we just want it disabled by default when cracking
>> saltless hashes.
>
> 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.

magnum

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