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speed up refresh_index() by utilizing preload_index() 

Speed up refresh_index() by utilizing preload_index() to do most of the work
spread across multiple threads.  This works because most cache entries will
get marked CE_UPTODATE so that refresh_cache_ent() can bail out early when
called from within refresh_index().

On a Windows repo with ~200K files, this drops refresh times from 6.64
seconds to 2.87 seconds for a savings of 57%.

Signed-off-by: Ben Peart <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ben Peart 2018-10-29 16:41:59 -04:00 committed by Junio C Hamano
parent c670b1f876
commit 99ce720c33
3 changed files with 13 additions and 4 deletions
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3
cache.h
View File

@ -659,6 +659,9 @@ extern int daemonize(void);
/* Initialize and use the cache information */
struct lock_file;
extern int read_index(struct index_state *);
extern void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags);
extern int read_index_preload(struct index_state *,
const struct pathspec *pathspec,
unsigned int refresh_flags);

8
preload-index.c
View File

@ -9,7 +9,7 @@
#include "progress.h"
#ifdef NO_PTHREADS
static void preload_index(struct index_state *index,
void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags)
{
@ -100,9 +100,9 @@ static void *preload_thread(void *_data)
return NULL;
}
static void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags)
void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags)
{
int threads, i, work, offset;
struct thread_data data[MAX_PARALLEL];

6
read-cache.c
View File

@ -1496,6 +1496,12 @@ int refresh_index(struct index_state *istate, unsigned int flags,
typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n");
added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n");
unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n");
/*
* Use the multi-threaded preload_index() to refresh most of the
* cache entries quickly then in the single threaded loop below,
* we only have to do the special cases that are left.
*/
preload_index(istate, pathspec, 0);
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce, *new_entry;
int cache_errno = 0;