The Intel vtune profiler [0] bolts on linux's perf subsystem and offers a very nice way of assessing if the cpu is stalled on memory (or cache) or os spending i

The Intel vtune profiler [0] bolts on linux's perf subsystem and offers a very nice way of assessing if the cpu is stalled on memory (or cache) or os spending its time computing. I guess is a nice GUI on (nowadays) standard Linux tracing interfaces, but I really did not dig enough. If you are after deep profiling, you should definitely give it a try. My recollection is totally positive. [0] https://software.intel.com/content/www/us/en/develop/tools/oneapi/components/vtune-profiler.html https://software.intel.com/content/www/us/en/develop/tools/o...