[slurm-users] CUDA vs OpenCL

Valerio Bellizzomi valerio at selnet.org
Thu May 6 08:34:58 UTC 2021

On Thu, 2021-05-06 at 08:00 +0000, Williams, Gareth (IM&T, Black
Mountain) wrote:
> The post has me thinking so I did a little searching... AMD have an
> offering that supports OpenCL and they are not NVIDIA. They use a
> different approach:
> https://rocmdocs.amd.com/en/latest/Programming_Guides/Opencl-programming-guide.html#masking-visible-devices

Thank you for the pointer. It seems to me that they just name the
variable differently (GPU_DEVICE_ORDINAL) but the approach is the same.

> FWIW I did not yet see anything there about cgroups and enforced
> device visibility/constraints vs playing nicely with environment
> variables.

Here documentation on device cgroups:

> For reference, I have no AMD affiliation and little to no direct
> experience.
> It is pretty easy to also find what else supports OpenCL
> (Wikipedia?). What environment to honor seems to me to mostly be a
> software choice and most of the software is from vendors, albeit
> sometimes being open source or using on or relying on open source
> components or layers.
> Gareth 
> -----Original Message-----
> From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf
> Of Valerio Bellizzomi
> Sent: Thursday, 6 May 2021 5:21 PM
> To: slurm-users at lists.schedmd.com
> Subject: Re: [slurm-users] CUDA vs OpenCL
> On Wed, 2021-04-28 at 10:56 +0200, Valerio Bellizzomi wrote:
> > Greetings,
> > I see here https://slurm.schedmd.com/gres.html#GPU_Management that 
> > CUDA_VISIBLE_DEVICES is available for NVIDIA GPUs, what about
> > OpenCL 
> > GPUs?
> > 
> > 
> > 
> Lack of followup lets me conclude that there isn't an OpenCL
> equivalent of CUDA_VISIBLE_DEVICES. It is unfortunate that this open
> source software is committed to a single gpu supplier.

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