Difference between revisions of "PipeliningIssues"
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== Description == | == Description == | ||
Modern CPU cores use pipelines to overlap different instructions to optimally distribute work over the execution units. The pattern "Pipelining issues" describes a problem in the pipeline which causes the reduction of the overlap and consequently less utilization. | Modern CPU cores use pipelines to overlap different instructions to optimally distribute work over the execution units. The pattern "Pipelining issues" describes a problem in the pipeline which causes the reduction of the overlap and consequently less utilization. | ||
Latest revision as of 07:31, 4 September 2019
Description
Modern CPU cores use pipelines to overlap different instructions to optimally distribute work over the execution units. The pattern "Pipelining issues" describes a problem in the pipeline which causes the reduction of the overlap and consequently less utilization.
Symptoms
- In-core throughput far away from design limit
- performance insensitive to data set size
Detection
- Large integral ratio of cycles to specific instruction count(s)
- bad (high) CPI
LIKWID performance groups: FLOPS_DP, FLOPS_SP, DATA and CLOCK