mirror of
https://github.com/git/git
synced 2024-08-27 03:29:21 +00:00
1a65b41b38
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>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#define USE_THE_INDEX_COMPATIBILITY_MACROS
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#include "builtin.h"
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#include "cache.h"
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#include "config.h"
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#include "tree.h"
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#include "cache-tree.h"
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#include "parse-options.h"
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static const char * const write_tree_usage[] = {
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N_("git write-tree [--missing-ok] [--prefix=<prefix>/]"),
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NULL
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};
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int cmd_write_tree(int argc, const char **argv, const char *cmd_prefix)
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{
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int flags = 0, ret;
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const char *tree_prefix = NULL;
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struct object_id oid;
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const char *me = "git-write-tree";
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struct option write_tree_options[] = {
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OPT_BIT(0, "missing-ok", &flags, N_("allow missing objects"),
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WRITE_TREE_MISSING_OK),
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OPT_STRING(0, "prefix", &tree_prefix, N_("<prefix>/"),
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N_("write tree object for a subdirectory <prefix>")),
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{ OPTION_BIT, 0, "ignore-cache-tree", &flags, NULL,
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N_("only useful for debugging"),
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PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, NULL,
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WRITE_TREE_IGNORE_CACHE_TREE },
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, cmd_prefix, write_tree_options,
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write_tree_usage, 0);
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prepare_repo_settings(the_repository);
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the_repository->settings.command_requires_full_index = 0;
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ret = write_cache_as_tree(&oid, flags, tree_prefix);
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switch (ret) {
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case 0:
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printf("%s\n", oid_to_hex(&oid));
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break;
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case WRITE_TREE_UNREADABLE_INDEX:
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die("%s: error reading the index", me);
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break;
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case WRITE_TREE_UNMERGED_INDEX:
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die("%s: error building trees", me);
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break;
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case WRITE_TREE_PREFIX_ERROR:
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die("%s: prefix %s not found", me, tree_prefix);
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break;
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}
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return ret;
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}
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