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Date: Mon, 8 Mar 2021 19:32:50 +0100
From: Lukas Odzioba <>
Subject: Re: Multi-gpu setup

On 8 mar 2021, 16:23 MichaƂ Majchrowicz <> wrote:
> Quick question. Does john splits gpu tasks equally?

It used, to I am not sure whether it is still the case. Please correct
me if I am wrong.

> I just run a md5crypt dict attack on a multi gpu system and noticed one of gpus
> finished way faster than other one.

Are those GPUs identical (same model)?

> If so can specify how big percentage will go to one gpu and how big to other ?

There is no easy way for that as far as I remember, but what you can do is to
split input dictionary manually in percentage which you would like to
use and then use  --devices=
parameter to specify an attack for a given subset of initial dictionary.

You can list devices seen by John by using "--list=opencl-devices" parameter, so
you would know which GPU corresponds to which id.


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