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Date: Tue, 29 May 2012 01:26:28 +0200
From: Lukas Odzioba <>
Subject: Re: GPU options (was: Cherry-picking from Lukas' repo)

2012/5/29 magnum <>:
> On 05/29/2012 12:58 AM, Lukas Odzioba wrote:
>> 2012/5/29 magnum <>:
>>> On 05/29/2012 12:40 AM, Lukas Odzioba wrote:
>>>> 2012/5/29 magnum <>:
>>>>> Not sure what you mean with earlier, but --device=list or
>>>>> --platform=list will call that.
>>>> Thank you, I couldn't find it in ./john output:
>>>> --platform=N (or =LIST)   set OpenCL platform, default 0
>>>> --device=N                set OpenCL device, default 0
>>>> I thought that LIST means sth like 1,2 isn't it misleading for user?
>>>> Just asking.
>>> I just mimiced existing options, like --subformat=LIST. But hey, you
>>> have a point: If/when we are going to support multiple devices it could
>>> be given as eg. --device=0,1.
>> This looks natural, I like it.
> Yes... but I now realize it wont suffice. In most cases you'd run a
> couple of same-model GPU's and they would probably be platform 0,
> devices 0 and 1. But on Bull, the Nvidia is platform 0, device 0 and the
> 7970 is platform 1, device 0. That would mean --platform=0,1 and
> --device=0 and it starts to get vague... and on some system we might
> want to run (platform,device) 0,1 and 1,0. I'm not sure how to
> accommodate that. Ideally we should come up with a better syntax for all
> of this before the Jumbo release.

So let's do not divide platform and device as a separate parameters
and use just  device like that: --device=0:1,0:2, where first number
is platform id and second is device id. What do you think about that?

>>> For now we could change the usage blob to
>>> --platform=N (or =LIST)   set OpenCL platform, default 0 (or list them)
>>> Is that a little more clear? The 80 char line limit force us to be very
>>> terse. An alternative is:
>> Alternative is empty:) but your first proposition is fine.
> Lol, it self-destructed. I was going to say:
> --platform=LIST           list OpenCL platforms and devices
> --platform=N              set OpenCL platform, default 0
> --device=N                set OpenCL device, default 0
> but this is yet another line of output, I don't like that. Anyway we
> might also want to add a CUDA device lister. What would be the syntax
> for it? Maybe we should drop the --platform=list syntax and incorporate
> these into the new --list option as two separate things: --list=cuda and
> --list=opencl. I think that will be the best option. However, this
> almost forces us to include the --list option in the usage blob so it
> will be one more line anyway...

If we will drop platform option as I stated previously, we could use
--device=LIST for both cuda and opencl. For opencl it could print also
platform information.


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