[slurm-users] RES: RES: multiple srun commands in the same SLURM script

Kevin Broch kbroch at rivosinc.com
Wed Nov 1 15:23:05 UTC 2023

Could this apply in your case:
https://slurm.schedmd.com/faq.html#opencl_pmix ?

On Wed, Nov 1, 2023 at 5:24 AM Paulo Jose Braga Estrela <
paulo.estrela at petrobras.com.br> wrote:

> Yeah, you are right. I don’t know why but it seems that my email client
> messed with message formatting putting all srun commands in one line.
> -----Mensagem original-----
> De: slurm-users <slurm-users-bounces at lists.schedmd.com> Em nome de
> Bjørn-Helge Mevik
> Enviada em: quarta-feira, 1 de novembro de 2023 04:55
> Para: slurm-users at schedmd.com
> Assunto: Re: [slurm-users] RES: multiple srun commands in the same SLURM
> script
> Paulo Jose Braga Estrela <paulo.estrela at petrobras.com.br> writes:
> > Hi,
> >
> > I think that you have a syntax error in your bash script. The "&"
> > means that you want to send a process to background not that you want
> > to run many commands in parallel. To run commands in a serial fashion
> > you should use cmd && cmd2, then the cmd2 will only be executed if the
> > command 1 return 0 as exit code.
> >
> > To run commands in parallel with srun you should set the number of
> > tasks to 4, so srun will spawn 4 tasks of the same command. Take a
> > look at the examples section in srun docs.
> > (https://slurm.schedmd.com/srun.html)
> Well, if you look at Example 7 in that section:
> Example 7:
>     This example shows a script in which Slurm is used to provide resource
> management for a job by executing the various job steps as processors
> become available for their dedicated use.
>     $ cat my.script
>     #!/bin/bash
>     srun -n4 prog1 &
>     srun -n3 prog2 &
>     srun -n1 prog3 &
>     srun -n1 prog4 &
>     wait
> which is what OP tries to do.  It is mainly for running *different*
> programs in parallel inside a job.  If one wants to run *the same* program
> in parallel, then a single srun is indeed the recommended way.
> I think the main problem is that the original job script only asks for a
> single CPU, so the sruns will only run one at a time.  Try adding
> --ntasks-per-node=4 or similar.
> Note that exactly how to run different programs in parallel with srun has
> changed quite a bit in the recent versions, and the example above is for
> the latest version, so check the srun man page for your version.
> (And unfortunately, the documentation in the srun man page has not always
> been correct, so you might need to experiment.  For instance, I believe
> Example 7 above is missing `--exact` or `SLURM_EXACT`. :) )
> --
> Regards,
> Bjørn-Helge Mevik, dr. scient,
> Department for Research Computing, University of Oslo
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