[slurm-users] Allocate more memory

[david vilanova]

Thanks for the quick response.

Should the following script do the trick ?? meaning use all required 
nodes to have at least 3G total memory ? even though my nodes were setup 
with 2G each ??

#SBATCH array 1-10%10:1

#SBATCH mem-per-cpu=3000m

srun R CMD BATCH myscript.R



thanks




On 07/02/2018 15:50, Loris Bennett wrote:
> Hi David,
>
> david martin <vilanew at gmail.com> writes:
>
>> 
>>
>> Hi,
>>
>> I would like to submit a job that requires 3Go. The problem is that I have 70 nodes available each node with 2Gb memory.
>>
>> So the command sbatch --mem=3G will wait for ressources to become available.
>>
>> Can I run sbatch and tell the cluster to use the 3Go out of the 70Go
>> available or is that a particular setup ? meaning is the memory
>> restricted to each node ? or should i allocate two nodes so that i
>> have 2x4Go availble ?
> Check
>
>    man sbatch
>
> You'll find that --mem means memory per node.  Thus, if you specify 3GB
> but all the nodes have 2GB, your job will wait forever (or until you buy
> more RAM and reconfigure Slurm).
>
> You probably want --mem-per-cpu, which is actually more like memory per
> task.  This is obviously only going to work if your job can actually run
> on more than one node, e.g. is MPI enabled.
>
> Cheers,
>
> Loris
>