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Pasti__Carolyn
Beginner
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Running coupled executables with different thread counts using LSF

 

Under LSF how can I run mutiple executables with different thread counts and still use the nodes efficiently?

Currently I have to do

#BSUB -R [ptile=7]

#BSUB -R affinity[core(4)]

mpirun  -n 8 -env OMP_NUM_THREADS=2 ./hellope : -n 12 -env OMP_NUM_THREADS=1 ./hellope : -n 8 -env OMP_NUM_THREADS=4 ./hellope

This will yield a otal number of 60 threads.  For a node with 28 processors it would take 3 nodes, but since I have one executable with 4 threads I have to tile it to allow for the maximum thread count so as to not overlap processes on cores.  This means I need to use another node even thougn I don't need all of the cores.  Is there a way I can pack this onto a node? or place the tasks where I want them?  I thought maybe something with using I_MPI_JOB_RESPECT_PROCESS_PLACEMENT and maybe defining the affinity somewhere else besides the job card?  Any thoughts would be appreciated.

 

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