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Date: Tue, 02 Jun 2015 21:55:08 +0200
From: magnum <>
Subject: Re: Multiple GPU and Fork

On 2015-06-02 21:19, Solar Designer wrote:
> On Tue, Jun 02, 2015 at 08:48:32PM +0200, Luis Rocha wrote:
>> # ./john --format=md5crypt-opencl --dev=0,1 --fork=2
>> initUnicode(UNICODE, 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.

I had no idea about this problem. For AMD I use to run a minimal xdm 
thing just out of habit, with both devices configured, and that works 
fine with Cat 14.9.


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