[slurm-users] Question about memory allocation

[Mahmood Naderan]

 >your job will be only runnable on nodes that offer at least 200 GB main
memory (sum of memory on all sockets/cpu of >the node)

But according to the manual

*--mem*=<*size[units]*> Specify the real memory required per node.

so, with

#SBATCH --mem=10GB
#SBATCH --nodes=4
#SBATCH --ntasks-per-node=5

the total requested memory should be 40GB and not 200GB.

Regards,
Mahmood




On Mon, Dec 16, 2019 at 10:19 AM Mahmood Naderan <mahmood.nt at gmail.com>
wrote:

> >No, this indicates the amount of residual/real memory as reqeusted per
> node. Your job will be only runnable on nodes >that offer at least 200 GB
> main memory (sum of memory on all sockets/cpu of the node). Please also
> have a closer look >at man sbatch.
>
>
> Thanks.
> Regarding the status of the nodes, I see
>     RealMemory=120705 AllocMem=1024 FreeMem=309 Sockets=32 Boards=1
>
> The question is why freemem is so much low while allocmem is far less than
> realmemory?
>
> Regards,
> Mahmood
>
>
>
>
> On Mon, Dec 16, 2019 at 10:12 AM Kraus, Sebastian <
> sebastian.kraus at tu-berlin.de> wrote:
>
>> Hi Mahmood,
>>
>>
>> >> will it reserve (looks for) 200GB of memory for the job? Or this is
>> the hard limit of the memory required by job?
>>
>>
>> No, this indicates the amount of residual/real memory as reqeusted per
>> node. Your job will be only runnable on nodes that offer at least 200 GB
>> main memory (sum of memory on all sockets/cpu of the node). Please also
>> have a closer look at man sbatch.
>>
>> Best
>> Sebastian
>>
>>
>>
>>
>> Sebastian Kraus
>> Team IT am Institut für Chemie
>>
>> Technische Universität Berlin
>> Fakultät II
>> Institut für Chemie
>> Sekretariat C3
>> Straße des 17. Juni 135
>> 10623 Berlin
>>
>> Email: sebastian.kraus at tu-berlin.de
>>
>> ------------------------------
>> *From:* slurm-users <slurm-users-bounces at lists.schedmd.com> on behalf of
>> Mahmood Naderan <mahmood.nt at gmail.com>
>> *Sent:* Monday, December 16, 2019 07:19
>> *To:* Slurm User Community List
>> *Subject:* [slurm-users] Question about memory allocation
>>
>> Hi,
>> If I write
>>
>> #SBATCH --mem=10GB
>> #SBATCH --nodes=4
>> #SBATCH --ntasks-per-node=5
>>
>> will it reserve (looks for) 200GB of memory for the job? Or this is the
>> hard limit of the memory required by job?
>>
>> Regards,
>> Mahmood
>>
>>
>>
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