SMT profiling with pmcstat and perf
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This article discusses profiling symmetric multithreading (SMT) on the POWER9 architecture. It uses both Big-endian FreeBSD with pmcstat and Debian with perf.
The knowledge presented here was derived from a variety of sources which can be found in the Additional Resources section.
Contents
Symmetric multithreading (SMT)
SMT principles
SMT is not "multi-core"
Comparison to RISC-V HARTs
Benchmark code
pmcstat
perf
Additional Resources
POWER9 Performance Monitoring Unit User Guide v12
George Neville-Neil's brief tutorial on pmcstat:
https://freebsdfoundation.org/wp-content/uploads/2014/03/Understanding-Application-and-System-Performance-with-HWPMC4.pdf
