ControlFlowIssues
Revision as of 16:13, 3 September 2019 by Daniel-schurhoff-de23@rwth-aachen.de (talk | contribs)
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Description
The pattern "Control flow issues" describes the case then the CPU core has to jump around in the instruction stream and bad prediction of condition evaluation
Symptoms
- In-core throughput far away from design limit
- performance insensitive to data set size
Detection
- High branch rate
- High ratio of mispredicted branches
LIKWID performance groups: BRANCH
Possible optimizations and/or fixes
- Avoid conditions in inner loops