By default each node has one virtual processor. Increase the number using the np attribute in the nodes file. The value of np can be equal to the number of physical cores on the node or it can be set to a value which represents available "execution slots" for the node. The value used is determined by the administrator based on hardware, system, and site criteria.
The following example shows how to set the np value in the nodes file. In this example, we are assuming that node001 and node002 has four physical cores. The administrator wants the value of np for node001 to reflect that it has four cores. However, node002 will be set up to handle multiple virtual processors without regard to the number of physical cores on the system.
server_priv/nodes:
node001 np=4
node002 np=12
...
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