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Date: Sat, 5 Mar 2016 18:45:27 +0100
From: Matus UHLAR - fantomas <>
Subject: Re: devices for --dev= option

>W dniu 05.03.2016 o 17:12, Matus UHLAR - fantomas pisze:
>> in README-OPENCL I read about --dev= option, but I don't quite understand
>> what it means.
>> this is error from "john --list=opencl-devices --dev=help"
>> Error: --device must be numerical, or one of "all", "cpu", "gpu" and
>> "accelerator".
>> is it supposed to list opencl-capable devices only?

On 05.03.16 17:57, Marek Wrzosek wrote:
>I think it should be:
>john --list=opencl-devices
>to list OpenCL-capable devices.

yes, but I somehow couldn't get --dev to complain without that one...

>And --device option is to choose one or more devices, if you have more
>than one OpenCL-capable device, for actual cracking process. This option
>allow only numerical values or keywords "all", "cpu", "gpu",
>"accelerator" (or "acc" for short).

yes, my question was if --dev only applies to opencl devices...

> To use OpenCL you need to choose
>format with OpenCL support.

autoswitching formats to nvidia or opencl versions would be great...

> But I could be wrong, because I don't have
>any OpenCL-capable device.

I have nvidia capable of opencl and cuda... however openl seems to be
faster.  The CPU should be opencl-capable too, and as long as the card has
about 225% performance of the CPU, using them all would be the best

Matus UHLAR - fantomas, ;
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
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