path: root/t/perf/
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2016-05-13perf: run "rebase -i" under perfJohannes Schindelin
This developer spent a lot of time trying to speed up the interactive rebase, in particular on Windows. And will continue to do so. To make it easier to demonstrate the performance improvement, let's have a reproducible performance test. The topic branch we use to test performance was found using these shell commands (essentially searching for a long-enough topic branch in Git's own history that touched the same file multiple times): git rev-list --parents origin/master | grep ' .* ' | while read commit rest do patch_count=$(git rev-list --count $commit^..$commit^2) test $patch_count -gt 20 || continue merges="$(git rev-list --parents $commit^..$commit^2 | grep ' .* ')" test -z "$merges" || continue patches_per_file="$(git log --pretty=%H --name-only \ $commit^..$commit^2 | grep -v '^$' | sort | uniq -c -d | sort -n -r)" test -n "$patches_per_file" && test 20 -lt $(echo "$patches_per_file" | sed -n '1s/^ *\([0-9]*\).*/\1/p') || continue printf 'commit %s\n%s\n' "$commit" "$patches_per_file" done Note that we can get away with *not* having to reset to the original branch tip before rebasing: we switch the first two "pick" lines every time, so we end up with the same patch order after two rebases, and the complexity of both rebases is equivalent. Signed-off-by: Johannes Schindelin <> Signed-off-by: Junio C Hamano <>