[slurm-users] [External] Re: srun : Communication connection failure

[Doug Meyer]

Hi,
Did you recently add nodes?  We have seen that when we add nodes past the
treewidth count the most recently added nodes will lose communication
(asterisk next to node name in sifo).  We have to ensure the treewidth
declaration in the slurm.conf matches or exceeds the number of nodes.

Doug

On Fri, Jan 21, 2022 at 4:33 AM Durai Arasan <arasan.durai at gmail.com> wrote:

> Hello MIke,
>
> I am able to ping the nodes from the slurm master without any problem.
> Actually there is nothing interesting in slurmctld.log or slurmd.log. You
> can trust me on this. That is why I posted here.
>
> Best,
> Durai Arasan
> MPI Tuebingen
>
> On Thu, Jan 20, 2022 at 5:08 PM Michael Robbert <mrobbert at mines.edu>
> wrote:
>
>> It looks like it could be some kind of network problem but could be DNS.
>> Can you ping and do DNS resolution for the host involved?
>>
>> What does slurmctld.log say? How about slurmd.log on the node in question?
>>
>>
>>
>> Mike
>>
>>
>>
>> *From: *slurm-users <slurm-users-bounces at lists.schedmd.com> on behalf of
>> Durai Arasan <arasan.durai at gmail.com>
>> *Date: *Thursday, January 20, 2022 at 08:08
>> *To: *Slurm User Community List <slurm-users at lists.schedmd.com>
>> *Subject: *[External] Re: [slurm-users] srun : Communication connection
>> failure
>>
>> *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.
>>
>>
>>
>> Hello slurm users,
>>
>>
>>
>> I forgot to mention that an identical interactive job works successfully
>> on the gpu partitions (in the same cluster). So this is really puzzling.
>>
>>
>>
>> Best,
>>
>> Durai Arasan
>>
>> MPI Tuebingen
>>
>>
>>
>> On Thu, Jan 20, 2022 at 3:40 PM Durai Arasan <arasan.durai at gmail.com>
>> wrote:
>>
>> Hello Slurm users,
>>
>>
>>
>> We are suddenly encountering strange errors while trying to launch
>> interactive jobs on our cpu partitions. Have you encountered this problem
>> before? Kindly let us know.
>>
>>
>>
>> [darasan84 at bg-slurmb-login1 ~]$ srun --job-name "admin_test231"
>> --ntasks=1 --nodes=1 --cpus-per-task=1 --partition=cpu-short --mem=1G
>>  --nodelist=slurm-cpu-hm-7 --time 1:00:00 --pty bash
>> srun: error: Task launch for StepId=1137134.0 failed on node
>> slurm-cpu-hm-7: Communication connection failure
>> srun: error: Application launch failed: Communication connection failure
>> srun: Job step aborted: Waiting up to 32 seconds for job step to finish.
>> srun: error: Timed out waiting for job step to complete
>>
>>
>>
>> Best regards,
>>
>> Durai Arasan
>>
>> MPI Tuebingen
>>
>>
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