What is issue efficiency? | GPU Glossary (original) (raw)

Issue efficiency measures how effectively thewarp scheduler keeps execution pipes busy by issuing instructions fromeligible warps .

An issue efficiency of 100% means everyscheduler issued an instruction on every cycle, indicating at least oneeligible warp on each cycle. Values below 100 % signal that, during some cycles, allactive warps werestalled - waiting on data, resources, or dependencies - so thescheduler sat idle and overall instruction throughput fell.