Dear Cafe, With Control.Concurrent, I would want to know, for a ThreadId, the total (up to now) (wallclock) time it was running/paused by the RTS scheduler. I guess that the scheduler's actions can be written to the eventlog for later analysis. Can I access them from inside a running program? I guess this is https://gitlab.haskell.org/ghc/ghc/-/wikis/event-log/live-monitoring , what is the status? - J.