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Date: Mon, 1 Jun 2015 13:52:58 +0800
From: Lei Zhang <>
Subject: Re: Interleaving of intrinsics

> On May 30, 2015, at 10:55 AM, Solar Designer <> wrote:
> Lei wrote:
>> Somehow I couldn't get useful info from a forked run of pbkdf2-hmac-sha256/512. I used the same settings as I benchmarked raw-md4(5), but only got output like:
>> Will run 4 OpenMP threads per process (240 total across 60 processes)
>> Node numbers 1-60 of 60 (fork)
>> Session stopped (max run-time reached)
>> I tried increasing  --max-run , but to no avail. Something wrong here?
> I suspect max_keys_per_crypt might be too high.  You'd want to find out
> what it was by examining the log file.  It shouldn't actually be high
> for a slow hash like this, but maybe it is (and needs to be lowered).

It's 15360. This doesn't look insanely high to me.

> Also, you never mentioned your full command line.  There might be
> something specific to the cracking mode you invoked and its settings.

I used the exact same settings as I benchmarked raw-md4, i.e.:
$ run/john --format=pbkdf2-hmac-sha256 --mask=?l?l?l?l?l?l?l?l --fork=60 --max-run=30 hash.sha256


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