Another possible use case of this is a regular MPI job where the first/controller task often uses more memory than the workers and may need to be scheduled on a higher memory node than them. I think I saw this happening in the past, but I'm not 100% sure it was in Slurm or some other scheduling system and I've lost all its references (and I would be interested to find if this is possible with Slurm, and if so how)
On Thu, Oct 31, 2024 at 1:10 AM Bhaskar Chakraborty via slurm-users < slurm-users@lists.schedmd.com> wrote: > Hello, > > Just to add some context here. We plan to use slurm for developing a sched > solution which interacts with a backend system. > > Now, the backend system has pieces of h/w which require specific host in > the allocation to be the primary/master host wherein the initial task would > be launched, this in turn is driven by the job's placement orientation on > the h/w itself. > > So, our primary task should launch in the asked primary host while > secondary / remote tasks would subsequently get started on other hosts. > > Hope this brings some context to the problem as to why a specific host is > necessary to be the starting host. > > Regards, > Bhaskar. > > On Thursday 31 October, 2024 at 12:04:37 am IST, Laura Hild <l...@jlab.org> > wrote: > > > I think if you tell the list why you care which of the Nodes is BatchHost, > they may be able to provide you with a better solution. > > > ________________________________________ > > Od: Bhaskar Chakraborty via slurm-users <slurm-users@lists.schedmd.com> > Poslano: sreda, 30. oktober 2024 12:35 > Za: slurm-us...@schedmd.com > Zadeva: [slurm-users] Change primary alloc node > > Hi, > > Is there a way to change/control the primary node (i.e. where the initial > task starts) as part of a job's allocation. > > For eg, if a job requires 6 CPUs & its allocation is distributed over 3 > hosts h1, h2 & h3 I find that it always starts the task in 1 particular > node (say h1) irrespective of how many slots were available in the hosts. > > Can we somehow let slurm have the primary node as h2? > > Is there any C-API inside select plugin which can do this trick if we were > to control it through the configured select plugin? > > Thanks. > -Bhaskar. > > -- > slurm-users mailing list -- slurm-users@lists.schedmd.com > To unsubscribe send an email to slurm-users-le...@lists.schedmd.com >
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