[slurm-users] [External] slurm only looking in "default" partition during scheduling

[Michael Robbert]

You have defined both of your partitions with “Default=YES”, but Slurm can have only one default partition. You can see from * on the compute partition in your sinfo output that Slurm selected that one as the default. When you use srun or sbatch it will only look at the default partition unless you use -p

To avoid confusion you should remove the Default=YES from one of the partitions and know that you will need to explicitly ask for the other (non-default) partition whenever you want to use it.

 

Mike

 

From: slurm-users <slurm-users-bounces at lists.schedmd.com> on behalf of Durai Arasan <arasan.durai at gmail.com>
Reply-To: Slurm User Community List <slurm-users at lists.schedmd.com>
Date: Tuesday, May 12, 2020 at 08:49
To: "slurm-users at lists.schedmd.com" <slurm-users at lists.schedmd.com>
Cc: "benjamin.glaessle at uni-tuebingen.de" <benjamin.glaessle at uni-tuebingen.de>
Subject: [External] [slurm-users] slurm only looking in "default" partition during scheduling

 

CAUTION: This email originated from outside of the Colorado School of Mines organization. Do not click on links or open attachments unless you recognize the sender and know the content is safe.

 

Hi, 

We have a cluster with 2 slave nodes. These are the slurm.conf lines describing nodes and partitions:

 

NodeName=slurm-gpu-1 NodeAddr=192.168.0.200  Procs=16 Gres=gpu:2 State=UNKNOWN
NodeName=slurm-gpu-2 NodeAddr=192.168.0.124  Procs=1 Gres=gpu:0 State=UNKNOWN
PartitionName=gpu Nodes=slurm-gpu-1 Default=YES MaxTime=INFINITE State=UP
PartitionName=compute Nodes=slurm-gpu-2 Default=YES MaxTime=INFINITE State=UP

 

Running sinfo gives the following:

 

PARTITION AVAIL  TIMELIMIT  NODES  STATE NODELIST
gpu          up   infinite      1   idle slurm-gpu-1
compute*     up   infinite      1   idle slurm-gpu-2

 

When I request a gpu job to be run using the following command:

 

srun --gres=gpu:2 nvidia-smi

 

I get the error:

 

srun: error: Unable to allocate resources: Requested node configuration is not available

 

and in slurmctld.log these are the entries:

 

[2020-05-12T14:33:47.578] _pick_best_nodes: JobId=55 never runnable in partition compute
[2020-05-12T14:33:47.578] _slurm_rpc_allocate_resources: Requested node configuration is not available 

 

It seems like slurm is looking only in the partition "compute" and not in the other partitions.
Even if I explicitly specify the gpu node to srun it fails:

 

srun --nodelist=slurm-gpu-1 nvidia-smi

 

I get the same error:

 

srun: error: Unable to allocate resources: Requested node configuration is not available

 

and in slurmctld.log:

 

[2020-05-12T14:38:57.242] No nodes satisfy requirements for JobId=56 in partition compute
[2020-05-12T14:38:57.242] _slurm_rpc_allocate_resources: Requested node configuration is not available

 

It is still looking in partition "compute" even after specifying the node to srun. 

 

But when I specify a partition, it works:

 

srun -p gpu nvidia-smi

 

But I would not like to specify the partition and would like slurm to select nodes based on the options specified in the srun command. Does anyone understand what is wrong in the setup?

 

Thanks,

Durai

 

 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.schedmd.com/pipermail/slurm-users/attachments/20200512/45d35cb1/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5173 bytes
Desc: not available
URL: <http://lists.schedmd.com/pipermail/slurm-users/attachments/20200512/45d35cb1/attachment.bin>