Check for failures in parseFile(), perf events tweaks

martinus / nanobench

Simple, fast, accurate single-header microbenchmarking functionality for C++11/14/17/20

https://nanobench.ankerl.com

MIT License

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Closed cj-tommi-rantala closed 1 year ago

cj-tommi-rantala commented 1 year ago

Check for failures when opening/reading any of the CPU frequency related sysfs files, to avoid needless warning messages.

Plus couple tweaks to the perf events:

Fallback to PERF_COUNT_HW_CPU_CYCLES, for example my laptop with AMD Ryzen CPU doesn't have the reference cycles event.
Add HW perf events before SW events, this fixes the events in one embedded device with 4.14 kernel.

martinus commented 1 year ago

Awesome, thanks!