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Date: Sat, 5 Oct 2019 14:00:32 +0200
From: Bernd Roehmer <>
Subject: Re: OpenCl on mesa amd

Thank you very much for your answers, Manjaro is usually rather up to
date, so I will check again after a mesa update.

kind regards,

Am 05.10.19 um 13:44 schrieb magnum:
> On 2019-10-04 12:31, Bernd Roehmer wrote:
>> I just installed opencl-mesa and ocl-icd on Manjaro and as well as
>> john 1.9.0.jumbo1-2.
>> I tried to test rar password cracking with the built in test but I am
>> running into error messages:
> We've seen many bugs in the MESA runtime and the RAR-opencl format is
> very well tested so I suspect you're seeing bugs in MESA.
>> Any ideas what I can do now? Running the test without opencl works
>> without a problem.
> Are you running latest'n'greatest MESA? While I really hope MESA and
> pocl eventually evolve to good stuff, your best bet is probably trying
> a proprietary driver. They can be installed side by side BTW.
>> I am curious why john opens 12 OpenMP processes, when it is supposed
>> to use the gpu. My cpu has 12 cores.
> The RAR-opencl format and very few others have some post-processing on
> CPU (if all early-reject tests pass) because the actual "unrar" code
> is more or less impossible to implement on GPU.
> magnum

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