[slurm-users] How to apply for multiple GPU cards from different worker nodes?

[Ran Du]

Dear Antony,

      It's worked!

      I checked the allocation, and here is the record:

      Nodes=gpu012 CPU_IDs=0-2 Mem=3072 GRES_IDX=gpu:v100(IDX:0-7)
Nodes=gpu013 CPU_IDs=0 Mem=1024 GRES_IDX=gpu:v100(IDX:0-7)

      The job has got what it applied for.

      And another question is : how to apply for multiple cards could not
be divided exactly by 8？ For example, to apply for 10 GPU cards, 8 cards on
one node and 2 cards on another node?

     Thanks a lot again for your kind help.

Best regards,
Ran


On Mon, Apr 15, 2019 at 8:25 PM Ran Du <bella.ran.du at gmail.com> wrote:

> Dear Antony,
>
>        Thanks a lot for your reply, I tried to submit a job with your
> advice, and no more sbatch errors.
>
>        But because our cluster is under maintenance, I have to wait till
> tomorrow to see if GPU cards are allocated correctly.  I will let you know
> as soon as the job is submitted successfully.
>
>        Thanks a lot for your kind help.
>
> Best regards,
> Ran
>
> On Mon, Apr 15, 2019 at 4:40 PM Antony Cleave <antony.cleave at gmail.com>
> wrote:
>
>> Ask for 8 gpus on 2 nodes instead.
>>
>> In your script just change the 16 to 8 and it should do what you want.
>>
>> You are currently asking for 2 nodes with 16 gpu each as Gres resources
>> are per node.
>>
>> Antony
>>
>> On Mon, 15 Apr 2019, 09:08 Ran Du, <bella.ran.du at gmail.com> wrote:
>>
>>> Dear all,
>>>
>>>      Does anyone know how to set #SBATCH options to get multiple GPU
>>> cards from different worker nodes?
>>>
>>>      One of our users would like to apply for 16 NVIDIA V100 cards for
>>> his job, and  there are 8 GPU cards on each worker node, I have tried the
>>> following #SBATCH options:
>>>
>>>       #SBATCH --partition=gpu
>>>       #SBATCH --qos=normal
>>>       #SBATCH --account=u07
>>>       #SBATCH --job-name=cross
>>>       #SBATCH --nodes=2
>>>       #SBATCH --mem-per-cpu=1024
>>>       #SBATCH --output=test.32^4.16gpu.log
>>>       #SBATCH --gres=gpu:v100:16
>>>
>>>       but got the sbatch error message :
>>>       sbatch: error: Batch job submission failed: Requested node
>>> configuration is not available
>>>
>>>       And I found a similar question on stack overflow:
>>>
>>> https://stackoverflow.com/questions/45200926/how-to-access-to-gpus-on-different-nodes-in-a-cluster-with-slurm
>>>
>>>       And it is said that multiple GPU cards allocation on different
>>> worker nodes are not available, the post is in 2017, is it still true at
>>> present?
>>>
>>>       Thanks a lot for your help.
>>>
>>> Best regards,
>>> Ran
>>>
>>
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