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Date: Tue, 27 Feb 2018 12:24:10 +0100
From: magnum <>
Subject: Re: Re: "No OpenCL devices was found" and "dri2
 connection failed!" errors, when using NVidia gpus

On 2018-02-27 00:06, Piotr Dobrogost wrote:
> It looks like device 0 is CPU, device 1 is glitch in the Matrix :), devices
> 2-9 are 8 Nvidia GPUs and device 10 is built-in/on-board GPU.
> I guess running john with --devices=2,3,4,5,6,7,8,9 option should result in
> work being distributed among all 8 GPUs.
> How can I check if it's really the case?
> I have all GPUs mining and when I run john with --devices=2,3,4,5,6,7,8,9
> option I see only the first GPU has lower hashrate which I take to mean john
> is running only on it and not on any other GPU.

Please read doc/README-OPENCL. You need to use the -fork option so you 
get one process per GPU. Something like this (but pause mining before this):

./john -fork=8 -dev=2,3,4,5,6,7,8,9 ( of command line)


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