Limit task (not job) to single node

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  Hello,

  I have a job with multiple OpenMP tasks, that are independent. Each task requires 4 cores to run, but these 4 cores should be on single node. How to limit task to single node, but not limit the whole job?

  Currently when I request 4 cores for each task, sometimes the cores are allocated as: 3 cores on 1 node + 1 core on another node (if there is other workload on cluster).

  I can't use resource unit type = node or socket because I want multiple tasks per node, and I have nodes with various number of cores in my cluster, i.e. I have nodes with 16 cores (8 cores per socket) and nodes with 64 cores (16 cores per socket). On node with 16 cores I would like to run 4 OpenMP tasks, on node with 64 cores -  16 tasks.

  
  

  Monday, May 29, 2017 6:11 AM