Ben, David I'm still baffled by how to reliably get GHC perf metrics on my local machine. The wiki page https://gitlab.haskell.org/ghc/ghc/wikis/building/running-tests/performance-... helps, but not enough! * There are two things going on: * CI perf measurements * Local machine perf measurements I think that they are somehow handled differently (why?) but they are all muddled up on the wiki page. * My goal is this: * Start with a master commit, say from Dec 2019. * Implement some change, on a branch. * sh validate -legacy (or something else if you like) * Look at perf regressions. * I believe I have first to utter the incantation $ git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git refs/notes/perf:refs/notes/ci/perf * But then: * How do I ensure that the baseline perf numbers I get relate to the master commit I started from, back in Dec 2019? I don't want numbers from Jan 2020. * If I rebase my branch on top of HEAD, say, how do I update the perf baseline numbers to be for HEAD? * Generally, how can I tell the commit to which the baseline numbers relate? * Also, in my tree I have a series of incremental changes; I want to see if any of them have perf regressions. How do I do that? Thanks Simon