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Date: Fri, 3 May 2013 11:06:40 -0300
From: Claudio André <>
Subject: Re: Mulit-gpu using claudio's interfaces

2013/1/19 Sayantan Datta <>

> Hi Claudio,magnum,

Just to let you know. I always had in my mind that core has to change in
order to create a proper multi-gpu stuff. Now that it did:

Suppose the user do something like this.
$ .john -dev=1,4

The main idea is that:
- it will do the same a fork=2 does
- one process will deal with dev=1 and another with dev=4 (I suppose the
real situation is that JtR has the main process plus only one forked in
this case . But this doesn't matter).
- my expectation is that just a few new lines would be necessary since fork
code is going to do the trick and common-opencl.c was developed with this
in mind.
- almost all opencl formats will start working at once. I expect problems
on Sayantan's 'avoidance' of  shared opencl code.
- so, my expectation is that his code will stay running as they do now.

This is not going to be done anytime soon (by me), but it is not a hard
task if anyone volunteers.


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