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stener__mauro
Beginner
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integration problem between Torque 4 and Intel(R) MPI Library for Linux* OS, Version 2019 Update 1

Hi!

I have successfully compiled and linked a program with IntelMPI and if I run it interactively or in background it runs very fast and without any problems on our new server (ProLiant DL580 Gen10, 1 node with 4 processors with 18 cores each, total 72 cores, hyperthreading disabled). If I try to submit it by Torque (version 4) strange things happen, for example:

1) if I submit 2 jobs asking each 8 cores they are both fine

2) if I submit a third job (8 cores) it is 4 times slower becasue the 8 process runs on two cores!

3) if I submit a fourth job it runs properly, but if I qdel all the four jobs, all of them disappear from qstat -a but the fourth is keeping running!

From previous discussion I notice in this forum, I have the feeling it is an integration problem between intelmpi and torque, so I did the following:

 export I_MPI_PIN=off
 export I_MPI_PIN_DOMAIN=socket

to run the program I did the following call of mpirun:

/opt/intel/compilers_and_libraries_2019.1.144/linux/mpi/intel64/bin/mpirun -d -rmk pbs -bootstrap pbsdsh .................

I have checked and PBS_ENVIRONMENT is properly set to PBS_BATCH

Also torque configuration is apparently correct, the file

/var/lib/torque/server_priv/nodes contains the following line:

dscfbeta1.units.it np=72 num_node_boards=1

This is a severe problem for me, since the machine is shared so we do need a scheduler like torque (pbs) to run jobs compiled and linked to intelmpi. Any help suggestion is welcome!

thank you in advance

Mauro

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