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author | René Scharfe <rene.scharfe@lsrfire.ath.cx> | 2012-04-01 00:11:01 +0200 |
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committer | Junio C Hamano <gitster@pobox.com> | 2012-04-11 08:50:54 -0700 |
commit | fbc08ea177f8284d10c62ad39de51edb21af88b0 (patch) | |
tree | a9a6ae74936951f3e68c377ba590bb4ae6c8151f /t/t6006-rev-list-format.sh | |
parent | commit: use mergesort() in commit_list_sort_by_date() (diff) | |
download | tgif-fbc08ea177f8284d10c62ad39de51edb21af88b0.tar.xz |
revision: insert unsorted, then sort in prepare_revision_walk()
Speed up prepare_revision_walk() by adding commits without sorting
to the commit_list and at the end sort the list in one go. Thanks
to mergesort() working behind the scenes, this is a lot faster for
large numbers of commits than the current insert sort.
Also introduce and use commit_list_reverse(), to keep the ordering
of commits sharing the same commit date unchanged. That's because
commit_list_insert_by_date() sorts commits with descending date,
but adds later entries with the same date entries last, while
commit_list_insert() always inserts entries at the top. The
following commit_list_sort_by_date() keeps the order of entries
sharing the same date.
Jeff's test case, in a repo with lots of refs, was to run:
# make a new commit on top of HEAD, but not yet referenced
sha1=`git commit-tree HEAD^{tree} -p HEAD </dev/null`
# now do the same "connected" test that receive-pack would do
git rev-list --objects $sha1 --not --all
With a git.git with a ref for each revision, master needs (best of
five):
real 0m2.210s
user 0m2.188s
sys 0m0.016s
And with this patch:
real 0m0.480s
user 0m0.456s
sys 0m0.020s
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t6006-rev-list-format.sh')
0 files changed, 0 insertions, 0 deletions