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I look through the tags about NPAR, but still can not understand it clearly.
Our supercomputer is a linux cluster, in which every node with 2 processors. Should i set NPAR as number of nodes or number of processors? which is better?
If the cpu is of multi-core, so what?
Thanks.

The rule of thumb may not be always true. So you'd better to test the NPAR setting, as it is also system-dependent.