Load Balancing

The CRE load-balances programs that execute in shared partitions--that is, in partitions that allow multiple jobs to run concurrently.

When you issue the mprun command in a shared partition, the CRE first determines what criteria (if any) you have specified for the node or nodes on which the program is to run. It then determines which nodes within the partition meet these criteria. If more nodes meet the criteria than are required to run your program, the CRE starts the program on the node or nodes that are least loaded. It examines the one-minute load averages of the nodes and ranks them accordingly.

This load-balancing mechanism ensures that your program's execution will not be unnecessarily delayed because it happened to be placed on a heavily loaded node. It also ensures that some nodes won't sit idle while other nodes are heavily loaded, thereby keeping overall throughput of the partition as high as possible.