I successfully installed openhpc on CentOS8.3 and I found weird behaviour of openpbs. (my compute node has 32 cpus)
If I directly login to compute node and run command ex. mpiexec.hydra -np 32 vasp_std (Intel MPI). The %cpu can reach ~100% (almost full speed) without any problem.
However, If I submit job through openpbs via pbs script, the %cpu will be reduce ~50% and the job will run at half speed even I set to use all cpus (#PBS -l nodes=1:ppn=32)
These results are from the same job and same compute node. It seems that openPBS block the total %cpu usage. I don’t know how to solve this problem.
Could you please help me to solve weird behaviour ?