[slurm-users] Correct way to do sbcast with sbatch

William Brown william at signalbox.org.uk
Sat Apr 18 09:30:17 UTC 2020

I will admit that I have not used sbcast but from reading the man pages I think that it does not do what you hope.


The sbcast command will indeed run on the first allocated node, so the source file must be accessible from there.  The man page does say that shared file systems are a better solution than sbcast, and I think that is the clue; sbcast is designed for clusters where there is no shared file system available between all the nodes.   If there was such a shared file system, the main part of the script (that executes on every node including the first) could just copy any file from shared storage to the local storage.  That might be common where the shared storage is e.g. NFS which might not be very fast, and make use of local fast storage on each node.


It sounds like sbcast also has some useful options for copying different files to different subsets of allocated nodes; there is an example for heterogenous jobs: https://slurm.schedmd.com/heterogeneous_jobs.html


Hopefully some else has actually used it and can give an idea how to do what you need to do.




From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf Of Hector Yuen
Sent: 18 April 2020 09:06
To: slurm-users at lists.schedmd.com
Subject: [slurm-users] Correct way to do sbcast with sbatch


Hello, I have a very basic question about using sbcast.


I start from the master node (the one running slurmctld). And have my binary there.


When I submit a job, I do this through sbatch. The first command I want to run is an sbcast. But by then I am already inside one of the allocated nodes for the job which doesn't have the binary in first place.


What is the correct way to use sbcast inside sbatch?






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