Dear developers, for convenience reasons, we want to hand out GPU cards only with a full CPU (8cores). Our plan was to modify e.g. the number of CPUs per task like in this example (1 GPU, 1 task):
job_desc ->pn_min_cpus = 8;
job_desc ->min_cpus = 8;
job_desc ->cpus_per_task = 8;
info("Setting CPUs per task to %d, (num_tasks=%d)",
job_desc->cpus_per_task,job_desc->num_tasks);
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For some unknown reason the modification of the job_descriptor terribly fails.
* In "scontrol show job=", we can read the intended modification (CPUs/task=8)
* In the job, we see 8 Tasks with 1 CPU, each.
Both cannot be true. Is this maybe a bug?
How can we come to the desired result?
Thank you,
Ulf
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Here is an example:
This command line:
srun -t 5 --cpus-per-task=1 --ntasks-per-node=1 -p gpu-interactive
--gres=gpu:1 --pty bash
results in this (slurmctld.log)
[2013-12-18T14:02:36.663] job_submit/zih_gpu: Setting CPUs per task to 8,
(num_tasks=1)
In the job I see:
SLURM_TASKS_PER_NODE=8
SLURM_CPUS_PER_TASK=1
"taskset -pc $$" gives:
pid 6706's current affinity list: 8
$ scontrol show job=3791288
JobId=3791288 Name=bash
...
NumNodes=1 NumCPUs=8 CPUs/Task=8 ReqS:C:T=*:*:*
MinCPUsNode=8 MinMemoryNode=24000M MinTmpDiskNode=0
Features=(null) Gres=gpu:1 Reservation=(null)
...
--
___________________________________________________________________
Dr. Ulf Markwardt
Technische Universität Dresden
Center for Information Services and High Performance Computing (ZIH)
01062 Dresden, Germany
Phone: (+49) 351/463-33640 WWW: http://www.tu-dresden.de/zih
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