ControlFlowIssues
Revision as of 14:11, 18 March 2019 by Thomas-gruber-5537@uni-erlangen.de (talk | contribs)
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