[slurm-users] Compute nodes cycling from idle to down on a regular basis ?
Jeremy.Fix at centralesupelec.fr
Wed Feb 2 18:56:48 UTC 2022
Hello , Thank you for your suggestion and I thank also thank Tina;
To answer your question, there is no TreeWidth entry in the slurm.conf
But it seems we figured out the issue .... and I'm so sorry we did not
think about it : we already had a pool of 48 nodes on the master but
their slurm.conf diverged from the ones on the pool of dancing state
nodes; At least, their slurmd was not restarted;
And actually several people suggested that the slurmd need to talk
between each other; That's really our fault; 100 nodes were aware of all
the 148 nodes and 48 nodes were only aware of themselves; I suppose that
created issues to the master;
So even if we also had other issues like interfaces flip flopping, the
diverged slurm.conf was probably the issue.
Thank you all for your help, It is time to compute :)
On 02/02/2022 16:27, Stephen Cousins wrote:
> Hi Jeremy,
> What is the value of TreeWidth in your slurm.conf? If there is no
> entry then I recommend setting it to a value a bit larger than the
> number of nodes you have in your cluster and then restarting slurmctld.
> On Wed, Feb 2, 2022 at 12:59 AM Jeremy Fix
> <Jeremy.Fix at centralesupelec.fr> wrote:
> A follow-up. I though some of nodes were ok but that's not the case;
> This morning, another pool of consecutive (why consecutive by the
> they are always consecutively failing) compute nodes are idle* .
> And now
> of the nodes which were drained came back to life in idle and now
> switched to idle*.
> One thing I should mention is that the master is now handling a
> total of
> 148 nodes; That's the new pool of 100 nodes which have a cycling
> The previous 48 nodes that already handled by this master are ok.
> I do not know if this should be considered a large system but we
> to have a look to settings such as the ARP cache  on the slurm
> master. I'm not very familiar with that, it seems to me it
> enlarges the
> cache of the node names/IPs table. This morning, the master has 125
> lines in "arp -a" (before changing the settings in systctl , it was
> like, 20 or so); Do you think this settings is also necessary on the
> compute nodes ?
> Steve Cousins Supercomputer Engineer/Administrator
> Advanced Computing Group University of Maine System
> 244 Neville Hall (UMS Data Center) (207) 581-3574
> Orono ME 04469 steve.cousins at maine.edu
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the slurm-users