I know very little about how SLURM works, but this sounds like it's a configuration issue - that it hasn't been configured in a way that indicates the login nodes cannot also be used as compute nodes. When I run salloc on the cluster I use, I *always* get a shell on a compute node, never on the login node that I ran salloc on.
Terry On Wed, Jan 2, 2019 at 4:56 PM Mahmood Naderan <mahmood...@gmail.com> wrote: > Currently, users run "salloc --spankx11 ./qemu.sh" where qemu.sh is a > script to run a qemu-system-x86_64 command. > When user (1) runs that command, the qemu is run on the login node since > the user is accessing the login node. When user (2) runs that command, his > qemu process is also running on the login node and so on. > > That is not what I want! > I expected slurm to dispatch the jobs on compute nodes. > > > Regards, > Mahmood > > > > > On Wed, Jan 2, 2019 at 7:39 PM Renfro, Michael <ren...@tntech.edu> wrote: > >> Not sure what the reasons behind “have to manually ssh to a node”, but >> salloc and srun can be used to allocate resources and run commands on the >> allocated resources: >> >> Before allocation, regular commands run locally, and no Slurm-related >> variables are present: >> >> ===== >> >> [renfro@login ~]$ hostname >> login >> [renfro@login ~]$ echo $SLURM_TASKS_PER_NODE >> >> >> ===== >> >> After allocation, regular commands still run locally, Slurm-related >> variables are present, and srun runs commands on the allocated node (my >> prompt change inside a job is a local thing, not done by default): >> >> ===== >> >> [renfro@login ~]$ salloc >> salloc: Granted job allocation 147867 >> [renfro@login(job 147867) ~]$ hostname >> login >> [renfro@login(job 147867) ~]$ echo $SLURM_TASKS_PER_NODE >> 1 >> [renfro@login(job 147867) ~]$ srun hostname >> node004 >> [renfro@login(job 147867) ~]$ exit >> exit >> salloc: Relinquishing job allocation 147867 >> [renfro@login ~]$ >> >> ===== >> >> Lots of people get interactive shells on a reserved node with some >> variant of ‘srun --pty $SHELL -I’, which doesn’t require explicitly running >> salloc or ssh, so what are you trying to accomplish in the end? >> >> -- >> Mike Renfro, PhD / HPC Systems Administrator, Information Technology >> Services >> 931 372-3601 / Tennessee Tech University >> >> > On Jan 2, 2019, at 9:24 AM, Mahmood Naderan <mahmood...@gmail.com> >> wrote: >> > >> > I want to know if there any any way to push the node selection part on >> slurm and not a manual thing that is done by user. >> > Currently, I have to manually ssh to a node and try to "allocate >> resources" using salloc. >> > >> > >> > Regards, >> > Mahmood >> >>
