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write-tree: integrate with sparse index

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Update 'git write-tree' to allow using the sparse-index in memory
without expanding to a full one.

The recursive algorithm for update_one() was already updated in 2de37c5
(cache-tree: integrate with sparse directory entries, 2021-03-03) to
handle sparse directory entries in the index. Hence we can just set the
requires-full-index to false for "write-tree".

The `p2000` tests demonstrate a ~96% execution time reduction for 'git
write-tree' using a sparse index:

Test                                           before  after
-----------------------------------------------------------------
2000.78: git write-tree (full-v3)              0.34    0.33 -2.9%
2000.79: git write-tree (full-v4)              0.32    0.30 -6.3%
2000.80: git write-tree (sparse-v3)            0.47    0.02 -95.8%
2000.81: git write-tree (sparse-v4)            0.45    0.02 -95.6%

Signed-off-by: Shuqi Liang <cheskaqiqi@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shuqi Liang
2023-04-03 20:35:39 -04:00
committed by Junio C Hamano
parent 768bb238c4
commit 1a65b41b38
3 changed files with 32 additions and 0 deletions
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3
builtin/write-tree.c
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@ -38,6 +38,9 @@ int cmd_write_tree(int argc, const char **argv, const char *cmd_prefix)
argc = parse_options(argc, argv, cmd_prefix, write_tree_options,
write_tree_usage, 0);
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
ret = write_cache_as_tree(&oid, flags, tree_prefix);
switch (ret) {
case 0: