On a cluster a job is submitted to run on N CPUs. qstat -f doesn't show how much CPU resources the job is using other than the time. How does one check whether 100% of each CPU power is used? It is essential to determining the resources required for the task.
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This documentation gave the solution, use pdsh to see output of 'top' on the node, or use 'all' command if a job is running on multiple nodes.
pdsh -j 123456 top -b -n 1 -u usr1234