ALUSaturation
Revision as of 16:13, 3 September 2019 by Daniel-schurhoff-de23@rwth-aachen.de (talk | contribs)
Description
The pattern "ALU saturation" describes the performance limitation caused by fully utilizing a functional unit inside a CPU core.
Symptoms
- Throughput at design limit(s)
- Good (low) CPI
- Integral ratio of cycles to specific instruction count(s).
Detection
Use a hardware-counter tool like:
- LIKWID with performance groups FLOPS_SP, FLOPS_DP, DATA and CLOCK
- Same information can be provided by perf or PAPI