Instrumentation is widely used in HPC performance engineering, but you may still do sampling, rather than tracing, with the result. Often only a specific set o

Instrumentation is widely used in HPC performance engineering, but you may still do sampling, rather than tracing, with the result. Often only a specific set of function calls is instrumented (e.g. MPI, i/o), and often using LD_PRELOAD and hooks provided for the purpose.