1. A method of aggregating job exit statuses of a plurality of compute nodes executing a parallel application, the method comprising: identifying, by a parallel computer control system, a subset of compute nodes in the parallel computer to execute the parallel application; selecting, by the parallel computer control system, one compute node in the subset of compute nodes in the parallel computer as a job leader compute node; initiating, by the parallel computer control system, execution of the parallel application on the subset of compute nodes; receiving, by the job leader compute node, an exit status from each compute node in the subset of compute nodes, wherein the exit status for each compute node includes information describing execution of some portion of the parallel application by the compute node; aggregating, by the job leader compute node, each exit status from each compute node in the subset of compute nodes; and sending, by the job leader compute node to the parallel computer control system, an aggregated exit status for the subset of compute nodes in the parallel computer.