Try
--ntasks-per-node=2 reather than
-ntasks-per-node=2
Quoting Леонид Коньков <[email protected]>:
To Rod Schultz.
I use sbatch. When I try
sbatch -a 0-19 -p mpi -n 20 -N 10 -ntasks-per-node=2 t40z0600s1.sh
or
sbatch -a 0-19 -p mpi -ntasks-per-node=2 t40z0600s1.sh
it says
sbatch: error: Invalid numeric value "tasks-per-node=2" for number of tasks.
Any suggestions?
Thanks anyway.
2014-07-29 2:11 GMT+11:00 Rod Schultz <[email protected]>:
Slurm’s default strategy is to fill entire nodes. That is why you are
getting some nodes with 8 tasks and some idle nodes.
Try srun –n 100 –N22 –ntasks-per-node=5 –l hostname
-n 100 means start 100 tasks,
-N 22 means all 22 nodes
--ntasks-per-node=5 distributes the tasks.
-l appends task number to the output, so you can see the distribution.
*From:* Marcin Stolarek [mailto:[email protected]]
*Sent:* Monday, July 28, 2014 7:17 AM
*To:* slurm-dev
*Subject:* [slurm-dev] Re: even CPU load
2014-07-28 8:00 GMT+02:00 Леонид Коньков <[email protected]>:
Hi.
I want my CPUs be loaded as even as possible. I have 22 nodes
(motherboards) with 1 CPU each with 8 CPU cores each. ( My English is far
from perfect, and I'm not shure what is what in you terminology.) I want to
load 100 onethread tasks with 4-5 tasks on one CPU. But tasks always fill
all 8 cores of CPU and leave some CPUs idle.
you mean doesn't leave any idle cpu? You want node to be responsible and
available for interactive work while tasks are running?
<--distribution=cyclic> and <--hint=memory_bound> don't help.
Leo.
[image: Image removed by sender.]
If I understood you correctly, you can limit the slurmd cpuset to a subset
of your cores, so jobs running under this cpuset won't use more than whole
cgroup/cpuset/slurm/.
cheers,
marcin
[image: Image removed by sender.]
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Morris "Moe" Jette
CTO, SchedMD LLC
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