Execute bench targets
michael-p opened this issue · comments
It seems it is not possible to run cargo instruments on a benchmark target (i.e. what gets executed by cargo bench). I think this would be a very useful addition!
A more generic solution might be to make it possible to just pass in a path to an arbitrary executable file.
I investigated benchmarks, and there were some problems. The main issue is that when you compile a benchmark target, the benchmark harness gets compiled in as well, which adds noise to the profile. I didn't dig into this too too much, so it's possible there's an easy solution, but it isn't totally obvious
That's right, however, I'm not sure it's really a problem if the benchmark harness gets profiled as well since the overhead/noise there shouldn't be too high. cargo flamegraph seems to do it that way, see flamegraph-rs/flamegraph#1 and PR flamegraph-rs/flamegraph#29
cool, that does look helpful.