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describe: enable sparse index for describe

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git describe compares the index with the working tree when (and only
when) it is run with the "--dirty" flag. This is done by the
run_diff_index() function. The function has been made aware of the
sparse-index in the series that led to 8d2c3732 (Merge branch
'ld/sparse-diff-blame', 2021-12-21). Hence we can just set the
requires-full-index to false for "describe".

Performance metrics

  Test                                                     HEAD~1            HEAD
  -------------------------------------------------------------------------------------------------
  2000.2: git describe --dirty (full-v3)                   0.08(0.09+0.01)   0.08(0.06+0.03) +0.0%
  2000.3: git describe --dirty (full-v4)                   0.09(0.07+0.03)   0.08(0.05+0.04) -11.1%
  2000.4: git describe --dirty (sparse-v3)                 0.88(0.82+0.06)   0.02(0.01+0.05) -97.7%
  2000.5: git describe --dirty (sparse-v4)                 0.68(0.60+0.08)   0.02(0.02+0.04) -97.1%
  2000.6: echo >>new && git describe --dirty (full-v3)     0.08(0.04+0.05)   0.08(0.05+0.04) +0.0%
  2000.7: echo >>new && git describe --dirty (full-v4)     0.08(0.07+0.03)   0.08(0.05+0.04) +0.0%
  2000.8: echo >>new && git describe --dirty (sparse-v3)   0.75(0.69+0.07)   0.02(0.03+0.03) -97.3%
  2000.9: echo >>new && git describe --dirty (sparse-v4)   0.81(0.73+0.09)   0.02(0.01+0.05) -97.5%

Signed-off-by: Raghul Nanth A <nanth.raghul@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Raghul Nanth A 2023-04-03 22:17:49 +05:30 committed by Junio C Hamano
parent 8d90352acc
commit 748b8d669a
3 changed files with 30 additions and 0 deletions
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2
builtin/describe.c
View File

@ -654,6 +654,8 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
int fd, result;
setup_work_tree();
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
repo_read_index(the_repository);
refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
NULL, NULL, NULL);

3
t/perf/p2000-sparse-operations.sh
View File

@ -43,6 +43,7 @@ test_expect_success 'setup repo and indexes' '
done &&
git sparse-checkout init --cone &&
git tag -a v1.0 -m "Final" &&
git sparse-checkout set $SPARSE_CONE &&
git checkout -b wide $OLD_COMMIT &&
@ -125,5 +126,7 @@ test_perf_on_all git checkout-index -f --all
test_perf_on_all git update-index --add --remove $SPARSE_CONE/a
test_perf_on_all "git rm -f $SPARSE_CONE/a && git checkout HEAD -- $SPARSE_CONE/a"
test_perf_on_all git grep --cached --sparse bogus -- "f2/f1/f1/*"
test_perf_on_all git describe --dirty
test_perf_on_all 'echo >>new && git describe --dirty'
test_done

25
t/t1092-sparse-checkout-compatibility.sh
View File

@ -1514,6 +1514,31 @@ test_expect_success 'sparse-index is not expanded: stash' '
ensure_not_expanded stash pop
'
test_expect_success 'describe tested on all' '
init_repos &&
# Add tag to be read by describe
run_on_all git tag -a v1.0 -m "Version 1" &&
test_all_match git describe --dirty &&
run_on_all rm g &&
test_all_match git describe --dirty
'
test_expect_success 'sparse-index is not expanded: describe' '
init_repos &&
# Add tag to be read by describe
git -C sparse-index tag -a v1.0 -m "Version 1" &&
ensure_not_expanded describe --dirty &&
echo "test" >>sparse-index/g &&
ensure_not_expanded describe --dirty &&
ensure_not_expanded describe
'
test_expect_success 'sparse index is not expanded: diff' '
init_repos &&