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| -rwxr-xr-x | t/perf/p5303-many-packs.sh | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/t/perf/p5303-many-packs.sh b/t/perf/p5303-many-packs.sh new file mode 100755 index 0000000000..3779851941 --- /dev/null +++ b/t/perf/p5303-many-packs.sh @@ -0,0 +1,87 @@ +#!/bin/sh + +test_description='performance with large numbers of packs' +. ./perf-lib.sh + +test_perf_large_repo + +# A real many-pack situation would probably come from having a lot of pushes +# over time. We don't know how big each push would be, but we can fake it by +# just walking the first-parent chain and having every 5 commits be their own +# "push". This isn't _entirely_ accurate, as real pushes would have some +# duplicate objects due to thin-pack fixing, but it's a reasonable +# approximation. +# +# And then all of the rest of the objects can go in a single packfile that +# represents the state before any of those pushes (actually, we'll generate +# that first because in such a setup it would be the oldest pack, and we sort +# the packs by reverse mtime inside git). +repack_into_n () { + rm -rf staging && + mkdir staging && + + git rev-list --first-parent HEAD | + sed -n '1~5p' | + head -n "$1" | + perl -e 'print reverse <>' \ + >pushes + + # create base packfile + head -n 1 pushes | + git pack-objects --delta-base-offset --revs staging/pack + + # and then incrementals between each pair of commits + last= && + while read rev + do + if test -n "$last"; then + { + echo "$rev" && + echo "^$last" + } | + git pack-objects --delta-base-offset --revs \ + staging/pack || return 1 + fi + last=$rev + done <pushes && + + # and install the whole thing + rm -f .git/objects/pack/* && + mv staging/* .git/objects/pack/ +} + +# Pretend we just have a single branch and no reflogs, and that everything is +# in objects/pack; that makes our fake pack-building via repack_into_n() +# much simpler. +test_expect_success 'simplify reachability' ' + tip=$(git rev-parse --verify HEAD) && + git for-each-ref --format="option no-deref%0adelete %(refname)" | + git update-ref --stdin && + rm -rf .git/logs && + git update-ref refs/heads/master $tip && + git symbolic-ref HEAD refs/heads/master && + git repack -ad +' + +for nr_packs in 1 50 1000 +do + test_expect_success "create $nr_packs-pack scenario" ' + repack_into_n $nr_packs + ' + + test_perf "rev-list ($nr_packs)" ' + git rev-list --objects --all >/dev/null + ' + + # This simulates the interesting part of the repack, which is the + # actual pack generation, without smudging the on-disk setup + # between trials. + test_perf "repack ($nr_packs)" ' + git pack-objects --keep-true-parents \ + --honor-pack-keep --non-empty --all \ + --reflog --indexed-objects --delta-base-offset \ + --stdout </dev/null >/dev/null + ' +done + +test_done |