[slurm-users] Allocate more memory

[rhc at open-mpi.org]

Afraid not - since you don’t have any nodes that meet the 3G requirement, you’ll just hang.

> On Feb 7, 2018, at 7:01 AM, david vilanova <vilanew at gmail.com> wrote:
> 
> 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
>> 
> 
>