rr does support multithreading[0]. "rr doesn't record shared-memory multithreading, so it forces your application's threads to execute serially. Your applicati

rr does support multithreading[0]. "rr doesn't record shared-memory multithreading, so it forces your application's threads to execute serially. Your application can see an additional slowdown if it takes advantage of multicore parallelism." [0]: https://github.com/mozilla/rr/wiki/Usage#recording-an-execution https://github.com/mozilla/rr/wiki/Usage#recording-an-execut...