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Revision d699676dda5fdf0996601006c3bac2a9c077a862 authored by Linus Torvalds on 10 August 2007, 19:31:20 UTC, committed by Junio C Hamano on 10 August 2007, 21:00:25 UTC 
Optimize the two-way merge of git-read-tree too
 
This trivially optimizes the two-way merge case of git-read-tree too,
which affects switching branches.

When you have tons and tons of files in your repository, but there are
only small differences in the branches (maybe just a couple of files
changed), the biggest cost of the branch switching was actually just the
index calculations.

This fixes it (timings for switching between the "testing" and "master"
branches in the 100,000 file testing-repo-from-hell, where the branches
only differ in one small file).

Before:
	[torvalds@woody bummer]$ time git checkout master
	real    0m9.919s
	user    0m8.461s
	sys     0m0.264s

After:
	[torvalds@woody bummer]$ time git checkout testing
	real    0m0.576s
	user    0m0.348s
	sys     0m0.228s

so it's easily an order of magnitude different.

This concludes the series. I think we could/should do the three-way merge
too (to speed up merges), but I'm lazy. Somebody else can do it.

The rule is very simple: you need to remove the old entry if:
 - you want to remove the file entirely
 - you replace it with a "merge conflict" entry (ie a non-stage-0 entry)

and you can avoid removing it if you either

 - keep the old one
 - or resolve it to a new one.

and these rules should all be valid for the three-way case too.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 288f072
Raw File
hash-object.c 
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 * Copyright (C) Junio C Hamano, 2005
 */
#include "cache.h"
#include "blob.h"

static void hash_object(const char *path, enum object_type type, int write_object)
{
	int fd;
	struct stat st;
	unsigned char sha1[20];
	fd = open(path, O_RDONLY);
	if (fd < 0 ||
	    fstat(fd, &st) < 0 ||
	    index_fd(sha1, fd, &st, write_object, type, path))
		die(write_object
		    ? "Unable to add %s to database"
		    : "Unable to hash %s", path);
	printf("%s\n", sha1_to_hex(sha1));
}

static void hash_stdin(const char *type, int write_object)
{
	unsigned char sha1[20];
	if (index_pipe(sha1, 0, type, write_object))
		die("Unable to add stdin to database");
	printf("%s\n", sha1_to_hex(sha1));
}

static const char hash_object_usage[] =
"git-hash-object [-t <type>] [-w] [--stdin] <file>...";

int main(int argc, char **argv)
{
	int i;
	const char *type = blob_type;
	int write_object = 0;
	const char *prefix = NULL;
	int prefix_length = -1;
	int no_more_flags = 0;

	for (i = 1 ; i < argc; i++) {
		if (!no_more_flags && argv[i][0] == '-') {
			if (!strcmp(argv[i], "-t")) {
				if (argc <= ++i)
					usage(hash_object_usage);
				type = argv[i];
			}
			else if (!strcmp(argv[i], "-w")) {
				if (prefix_length < 0) {
					prefix = setup_git_directory();
					prefix_length =
						prefix ? strlen(prefix) : 0;
				}
				write_object = 1;
			}
			else if (!strcmp(argv[i], "--")) {
				no_more_flags = 1;
			}
			else if (!strcmp(argv[i], "--help"))
				usage(hash_object_usage);
			else if (!strcmp(argv[i], "--stdin")) {
				hash_stdin(type, write_object);
			}
			else
				usage(hash_object_usage);
		}
		else {
			const char *arg = argv[i];
			if (0 <= prefix_length)
				arg = prefix_filename(prefix, prefix_length,
						      arg);
			hash_object(arg, type_from_string(type), write_object);
			no_more_flags = 1;
		}
	}
	return 0;
}
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