I imagine you could create a reservation for the node and then when you
are completely done, remove the reservation.
Each helper could then target the reservation for the job.
Brian Andrus
On 2/9/2024 5:52 PM, Alan Stange via slurm-users wrote:
Chip,
Thank you for your prompt response. We could do that, but the helper is
optional, and at times might involve additional helpers depending on
the inputs to the problem being solved, and we don't a priori know the
number of helpers that might be needed.
Alan
On 2/9/24 10:59, Chip Seraphine wrote:
Normally I'd address this by having an sbatch script allocate enough resources
for both jobs (specifying one node), and then kick off the helper as a separate
step (assuming I am understanding your issue correctly).
On 2/9/24, 9:57 AM, "Alan Stange via slurm-users" <slurm-users@lists.schedmd.com
<mailto:slurm-users@lists.schedmd.com>> wrote:
Hello all,
I'm somewhat new to Slurm, but long time user of other batch systems.
Assume we have a simple cluster of uniform racks of systems with no
special resources, and our jobs are all single cpu tasks.
Lets say I have a long running job in the cluster, which needs to spawn
a helper process into the cluster. We have a strong preference for this
helper to run on the same cluster node as the original job, but if that
node is already scheduled full, then we want this new task to be
scheduled on another systems without any delay.
The problem I have is that the --nodelist doesn't solve this, and, as
far as I can tell, there's no option with --prefer to specify a node
name as a resource, without creating a gres for every hostname in the
cluster.
It seems like what I'm trying to do should be achievable, but having
read though the documentation and searched the archives of this list,
I'm not seeing a solution.
I'm hoping someone here has some experience with this and can point me
in the right direction.
Sincerely,
Alan
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