This function returns the number of nodes the cluster is configured to support. Note that this is the potential size of the cluster, not the current number of available nodes or the count of machines assigned node numbers.
Returns the number of slave nodes the system is configured to support. If the BProc system is not loaded, returns 0 and sets errno to
Returns -1 on error, and sets errno.
The BProc system is loaded but not configured or active.
Insufficient kernel memory was available.