Where is Criterion's output, or how do I enable it?

Question

The Criterion benchmarking library for Rust is documented as generating plots describing the benchmark results:

Criterion.rs can generate a number of useful charts and graphs which you can check to get a better understanding of the behavior of the benchmark.

The plots and saved data are stored under target/criterion/$BENCHMARK_NAME/.

However, after running cargo bench and seeing Criterion's output on the terminal, I don't see a directory named target/criterion/. Where is the output now, or what do I have to do to activate it?

Answer 1

This was a small bug (criterion issue #192): when Criterion is used in a Cargo workspace, it doesn't find the workspace's target directory, and ends up writing its results to <individual crate directory>/target/criterion instead.

The Cargo extension cargo-criterion was supposed to work around this but unfortunately for my particular case, currently didn't work on macOS (cargo-criterion issue #12).

Both issues has been fixed; since version 0.3.4 criterion writes its output to the correct directory, and cargo-criterion also works on macOS.