[slurm-users] A little help writing a select plugin ?

[PULIDO, Alexandre]

Hi,
I've been trying to modify the select_cons_res plugin to take into account the free memory on a job, more context on the mailing list here<https://groups.google.com/forum/#!topic/slurm-users/tpn7dev4GEU>. I figured I need to edit the definition of "free_mem" here<https://github.com/SchedMD/slurm/blob/master/src/plugins/select/cons_res/job_test.c#L853> and subtract the actual free memory on the node instead of the allocated one.
So I've been searching the whole source code trying to understand how the node's usage is calculated/passed to the "_verify_node_state" function, or anywhere actually. The goal is only to edit the plugin, I was hoping to do so without modifying slurmctld, in order to use the free memory on the node.

I figured I need to add the mem_free variable to the node usage structure, but I really don't get how the structure is being filled up with the actual resource usage.

Could you give me a little help and guide me towards the resolution  ?


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