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Date: Tue, 15 Sep 2015 21:37:55 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Judy array

On 2015-09-15 17:24, Solar Designer wrote:
> On Tue, Sep 15, 2015 at 09:53:52AM +0200, magnum wrote:
>> 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.

Do you have a suggestion for a new default? Loading tens of millions of 
salts isn't something you normally do anyway. What is the total memory 
impact of bumping it to eg. 20?

Or... what would the impact be for simply making it a global variable? 
Some hash/index calculations would become less optimized but perhaps it 
wouldn't harm that much?

magnum

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