On 5/10/2019 11:09 AM, Ævar Arnfjörð Bjarmason wrote: > Here's a flamegraph of where git's test suite spends its time on my box: > https://vm.nix.is/~avar/noindex/git-tests.svg > > I hacked up a script for this today to plot trace2 production data, as > noted there it's at: > https://github.com/avar/FlameGraph/tree/stackcollapse-git-tr2-event > > What are flamegraphs? See http://www.brendangregg.com/flamegraphs.html > > As noted in TODOs in the script there's various stuff I'd like to do > better, and this also shows how we need a lot more trace regions to get > granular data. > > But it's already quite cool, and I'll keep improving it. I'll submit a > PR to Brendan's parent repo once I'm happy enough with it, I figure it > makes more sense there than in git.git, but maybe we'd eventually want > to teach the test suite to optionally use something like this. This is a neat idea. Thanks! For anyone else giving this a try, here are the steps I took to create my own [1], much smaller test: # run some tests export GIT_TR2_EVENT=~/git-tr2-event.txt git fetch --all git gc git push # get the FlameGraph repo git clone https://github.com/avar/FlameGraph.git cd FlameGraph ( # Get the proper perl packages, if you don't have them sudo apt install cpanminus sudo cpanm install JSON::XS ) ./stackcollapse-git-tr2-event.pl ~/git-tr2-event.txt | ./flamegraph.pl >git-test.svg [1] https://github.com/derrickstolee/FlameGraph/blob/git-test/git-test.svg
