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Date: Fri, 10 Oct 2014 12:05:07 +0400
From: Solar Designer <>
Subject: Re: "Failed copy data to gpu" when using fork with descrypt-opencl

Hi Royce,

Thank you for reporting this.  On further occasions, please direct such
postings to john-users rather than john-dev.  This is essentially user
experience, and it's useful for other users to know that they may/should
use --fork for this purpose, and that it failed in this version for this
GPU type.

On Thu, Oct 09, 2014 at 11:58:26PM -0800, Royce Williams wrote:
> When running this version of bleeding-jumbo:
> commit 3d8c4ea17f918130e62108be91309883c7023541
> Merge: 379881a 53cbf8b
> Author: Dhiru Kholia <>
> Date:   Thu Oct 9 20:28:03 2014 +0200
> ... I'm getting the following error when I try to use fork to get more
> CPU cores participating in feeding my GPU:

Did this work for you before, on this same GPU, with older
bleeding-jumbo?  Can you identify the newer version that worked?

And yes, you're right in using --fork to speedup descrypt-opencl.
In fact, once this issue is resolved, I think you'll want to use
something like --fork=4.


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