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send-pack.c: add config push.useBitmaps

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Reachability bitmaps are designed to speed up the "counting objects"
phase of generating a pack during a clone or fetch. They are not
optimized for Git clients sending a small topic branch via "git push".
In some cases (see [1]), using reachability bitmaps during "git push"
can cause significant performance regressions.

Add a new "push.useBitmaps" configuration variable to allow users to
tell "git push" not to use bitmaps. We already have "pack.bitmaps"
that controls the use of bitmaps, but a separate configuration variable
allows the reachability bitmaps to still be used in other areas,
such as "git upload-pack", while disabling it only for "git push".

[1]: https://lore.kernel.org/git/87zhoz8b9o.fsf@evledraar.gmail.com/

Signed-off-by: Kyle Zhao <kylezhao@tencent.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kyle Zhao
2022-06-17 19:06:19 +00:00
committed by Junio C Hamano
parent 8168d5e9c2
commit 82f67ee13f
4 changed files with 35 additions and 1 deletions
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22
t/t5516-fetch-push.sh
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@ -1865,4 +1865,26 @@ test_expect_success 'push warns or fails when using username:password' '
test_line_count = 1 warnings
'
test_expect_success 'push with config push.useBitmaps' '
mk_test testrepo heads/main &&
git checkout main &&
test_unconfig push.useBitmaps &&
GIT_TRACE2_EVENT="$PWD/default" \
git push testrepo main:test &&
test_subcommand git pack-objects --all-progress-implied --revs --stdout \
--thin --delta-base-offset -q <default &&
test_config push.useBitmaps true &&
GIT_TRACE2_EVENT="$PWD/true" \
git push testrepo main:test2 &&
test_subcommand git pack-objects --all-progress-implied --revs --stdout \
--thin --delta-base-offset -q <true &&
test_config push.useBitmaps false &&
GIT_TRACE2_EVENT="$PWD/false" \
git push testrepo main:test3 &&
test_subcommand git pack-objects --all-progress-implied --revs --stdout \
--thin --delta-base-offset -q --no-use-bitmap-index <false
'
test_done