Low-impact performance sampling within a massively parallel computer

摘要

An apparatus, program product and method sample at different times nodes that are performing similar work. Performance data associated with first and second node subsets performing the similar work are sampled at different times, e.g., in a round-robin fashion, and in accordance with a given sampling rate. The performance data is analyzed. Nodes whose performance suffers as a result of a sampling operation may be identified and removed from a subsequent operation.