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Date: Tue, 2 Jun 2015 22:19:49 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Multiple GPU and Fork

On Tue, Jun 02, 2015 at 08:48:32PM +0200, Luis Rocha wrote:
> # ./john 3-base.md5crypt.pw --format=md5crypt-opencl --dev=0,1 --fork=2
> initUnicode(UNICODE, ASCII/ASCII)
> ASCII -> ASCII -> ASCII
> Loaded 1726 password hashes with 1726 different salts (md5crypt-opencl,
> crypt(3) $1$ [MD5 OpenCL])
> Node numbers 1-2 of 2 (fork)
> Device id 0 not working correctly, skipping.
> Device id 1 not working correctly, skipping.
> No OpenCL devices found

Yes, --fork fails like that with newer versions of Catalyst - those that
no longer require X running to access the individual devices via OpenCL.
I don't yet know if this can be worked around by starting X anyway or
not - you may try.

Alexander

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