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+#!/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