Profilers Instrumenting Vs Sampling

Question

I am doing a study to between profilers mainly instrumenting and sampling. I have came up with the following info:

• sampling: stop the execution of program, take PC

Answer 1

The interrupts generated by a sampling profiler generally add an insignficant amount of time to the total execution time, unless you have a very short sampling interval (e.g. < 1 ms).

With instrumented profiling there can be a large overhead, e.g. on small leaf functions that get called many times, as the calls to the instrumentation library can be significant compared to the execution time of the function.