Andrew's git / gitweb.git / diff
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update-index: manually enable or disable untracked cache
authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Sun, 8 Mar 2015 10:12:42 +0000 (17:12 +0700)
committerJunio C Hamano <gitster@pobox.com>
Thu, 12 Mar 2015 20:45:18 +0000 (13:45 -0700)
Overall time saving on "git status" is about 40% in the best case
scenario, removing ..collect_untracked() as the most time consuming
function. read and refresh index operations are now at the top (which
should drop when index-helper and/or watchman support is added). More
numbers and analysis below.

webkit.git
==========

169k files. 6k dirs. Lots of test data (i.e. not touched most of the
time)

Base status
-----------

Index version 4 in split index mode and cache-tree populated. No
untracked cache. It shows how time is consumed by "git status". The
same settings are used for other repos below.

18:28:10.199679 builtin/commit.c:1394 performance: 0.000000451 s: cmd_status:setup
18:28:10.474847 read-cache.c:1407 performance: 0.274873831 s: read_index
18:28:10.475295 read-cache.c:1407 performance: 0.000000656 s: read_index
18:28:10.728443 preload-index.c:131 performance: 0.253147487 s: read_index_preload
18:28:10.741422 read-cache.c:1254 performance: 0.012868340 s: refresh_index
18:28:10.752300 wt-status.c:623 performance: 0.010421357 s: wt_status_collect_changes_worktree
18:28:10.762069 wt-status.c:629 performance: 0.009644748 s: wt_status_collect_changes_index
18:28:11.601019 wt-status.c:632 performance: 0.838859547 s: wt_status_collect_untracked
18:28:11.605939 builtin/commit.c:1421 performance: 0.004835004 s: cmd_status:update_index
18:28:11.606580 trace.c:415 performance: 1.407878388 s: git command: 'git' 'status'

Populating status
-----------------

This is after enabling untracked cache and the cache is still empty.
We see a slight increase in .._collect_untracked() and update_index
(because new cache has to be written to $GIT_DIR/index).

18:28:18.915213 builtin/commit.c:1394 performance: 0.000000326 s: cmd_status:setup
18:28:19.197364 read-cache.c:1407 performance: 0.281901416 s: read_index
18:28:19.197754 read-cache.c:1407 performance: 0.000000546 s: read_index
18:28:19.451355 preload-index.c:131 performance: 0.253599607 s: read_index_preload
18:28:19.464400 read-cache.c:1254 performance: 0.012935336 s: refresh_index
18:28:19.475115 wt-status.c:623 performance: 0.010236920 s: wt_status_collect_changes_worktree
18:28:19.486022 wt-status.c:629 performance: 0.010801685 s: wt_status_collect_changes_index
18:28:20.362660 wt-status.c:632 performance: 0.876551366 s: wt_status_collect_untracked
18:28:20.396199 builtin/commit.c:1421 performance: 0.033447969 s: cmd_status:update_index
18:28:20.396939 trace.c:415 performance: 1.482695902 s: git command: 'git' 'status'

Populated status
----------------

After the cache is populated, wt_status_collect_untracked() drops 82%
from 0.838s to 0.144s. Overall time drops 45%. Top offenders are now
read_index() and read_index_preload().

18:28:20.408605 builtin/commit.c:1394 performance: 0.000000457 s: cmd_status:setup
18:28:20.692864 read-cache.c:1407 performance: 0.283980458 s: read_index
18:28:20.693273 read-cache.c:1407 performance: 0.000000661 s: read_index
18:28:20.958814 preload-index.c:131 performance: 0.265540254 s: read_index_preload
18:28:20.972375 read-cache.c:1254 performance: 0.013437429 s: refresh_index
18:28:20.983959 wt-status.c:623 performance: 0.011146646 s: wt_status_collect_changes_worktree
18:28:20.993948 wt-status.c:629 performance: 0.009879094 s: wt_status_collect_changes_index
18:28:21.138125 wt-status.c:632 performance: 0.144084737 s: wt_status_collect_untracked
18:28:21.173678 builtin/commit.c:1421 performance: 0.035463949 s: cmd_status:update_index
18:28:21.174251 trace.c:415 performance: 0.766707355 s: git command: 'git' 'status'

gentoo-x86.git
==============

This repository is a strange one with a balanced, wide and shallow
worktree (about 100k files and 23k dirs) and no .gitignore in
worktree. .._collect_untracked() time drops 88%, total time drops 56%.

Base status
-----------
18:20:40.828642 builtin/commit.c:1394 performance: 0.000000496 s: cmd_status:setup
18:20:41.027233 read-cache.c:1407 performance: 0.198130532 s: read_index
18:20:41.027670 read-cache.c:1407 performance: 0.000000581 s: read_index
18:20:41.171716 preload-index.c:131 performance: 0.144045594 s: read_index_preload
18:20:41.179171 read-cache.c:1254 performance: 0.007320424 s: refresh_index
18:20:41.185785 wt-status.c:623 performance: 0.006144638 s: wt_status_collect_changes_worktree
18:20:41.192701 wt-status.c:629 performance: 0.006780184 s: wt_status_collect_changes_index
18:20:41.991723 wt-status.c:632 performance: 0.798927029 s: wt_status_collect_untracked
18:20:41.994664 builtin/commit.c:1421 performance: 0.002852772 s: cmd_status:update_index
18:20:41.995458 trace.c:415 performance: 1.168427502 s: git command: 'git' 'status'
Populating status
-----------------
18:20:48.968848 builtin/commit.c:1394 performance: 0.000000380 s: cmd_status:setup
18:20:49.172918 read-cache.c:1407 performance: 0.203734214 s: read_index
18:20:49.173341 read-cache.c:1407 performance: 0.000000562 s: read_index
18:20:49.320013 preload-index.c:131 performance: 0.146671391 s: read_index_preload
18:20:49.328039 read-cache.c:1254 performance: 0.007921957 s: refresh_index
18:20:49.334680 wt-status.c:623 performance: 0.006172020 s: wt_status_collect_changes_worktree
18:20:49.342526 wt-status.c:629 performance: 0.007731746 s: wt_status_collect_changes_index
18:20:50.257510 wt-status.c:632 performance: 0.914864222 s: wt_status_collect_untracked
18:20:50.338371 builtin/commit.c:1421 performance: 0.080776477 s: cmd_status:update_index
18:20:50.338900 trace.c:415 performance: 1.371462446 s: git command: 'git' 'status'
Populated status
----------------
18:20:50.351160 builtin/commit.c:1394 performance: 0.000000571 s: cmd_status:setup
18:20:50.577358 read-cache.c:1407 performance: 0.225917338 s: read_index
18:20:50.577794 read-cache.c:1407 performance: 0.000000617 s: read_index
18:20:50.734140 preload-index.c:131 performance: 0.156345564 s: read_index_preload
18:20:50.745717 read-cache.c:1254 performance: 0.011463075 s: refresh_index
18:20:50.755176 wt-status.c:623 performance: 0.008877929 s: wt_status_collect_changes_worktree
18:20:50.763768 wt-status.c:629 performance: 0.008471633 s: wt_status_collect_changes_index
18:20:50.854885 wt-status.c:632 performance: 0.090988721 s: wt_status_collect_untracked
18:20:50.857765 builtin/commit.c:1421 performance: 0.002789097 s: cmd_status:update_index
18:20:50.858411 trace.c:415 performance: 0.508647673 s: git command: 'git' 'status'

linux-2.6
=========

Reference repo. Not too big. .._collect_status() drops 84%. Total time
drops 42%.

Base status
-----------
18:34:09.870122 builtin/commit.c:1394 performance: 0.000000385 s: cmd_status:setup
18:34:09.943218 read-cache.c:1407 performance: 0.072871177 s: read_index
18:34:09.943614 read-cache.c:1407 performance: 0.000000491 s: read_index
18:34:10.004364 preload-index.c:131 performance: 0.060748102 s: read_index_preload
18:34:10.008190 read-cache.c:1254 performance: 0.003714285 s: refresh_index
18:34:10.012087 wt-status.c:623 performance: 0.002775446 s: wt_status_collect_changes_worktree
18:34:10.016054 wt-status.c:629 performance: 0.003862140 s: wt_status_collect_changes_index
18:34:10.214747 wt-status.c:632 performance: 0.198604837 s: wt_status_collect_untracked
18:34:10.216102 builtin/commit.c:1421 performance: 0.001244166 s: cmd_status:update_index
18:34:10.216817 trace.c:415 performance: 0.347670735 s: git command: 'git' 'status'
Populating status
-----------------
18:34:16.595102 builtin/commit.c:1394 performance: 0.000000456 s: cmd_status:setup
18:34:16.666600 read-cache.c:1407 performance: 0.070992413 s: read_index
18:34:16.667012 read-cache.c:1407 performance: 0.000000606 s: read_index
18:34:16.729375 preload-index.c:131 performance: 0.062362492 s: read_index_preload
18:34:16.732565 read-cache.c:1254 performance: 0.003075517 s: refresh_index
18:34:16.736148 wt-status.c:623 performance: 0.002422201 s: wt_status_collect_changes_worktree
18:34:16.739990 wt-status.c:629 performance: 0.003746618 s: wt_status_collect_changes_index
18:34:16.948505 wt-status.c:632 performance: 0.208426710 s: wt_status_collect_untracked
18:34:16.961744 builtin/commit.c:1421 performance: 0.013151887 s: cmd_status:update_index
18:34:16.962233 trace.c:415 performance: 0.368537535 s: git command: 'git' 'status'
Populated status
----------------
18:34:16.970026 builtin/commit.c:1394 performance: 0.000000631 s: cmd_status:setup
18:34:17.046235 read-cache.c:1407 performance: 0.075904673 s: read_index
18:34:17.046644 read-cache.c:1407 performance: 0.000000681 s: read_index
18:34:17.113564 preload-index.c:131 performance: 0.066920253 s: read_index_preload
18:34:17.117281 read-cache.c:1254 performance: 0.003604055 s: refresh_index
18:34:17.121115 wt-status.c:623 performance: 0.002508345 s: wt_status_collect_changes_worktree
18:34:17.125089 wt-status.c:629 performance: 0.003871636 s: wt_status_collect_changes_index
18:34:17.156089 wt-status.c:632 performance: 0.030895703 s: wt_status_collect_untracked
18:34:17.169861 builtin/commit.c:1421 performance: 0.013686404 s: cmd_status:update_index
18:34:17.170391 trace.c:415 performance: 0.201474531 s: git command: 'git' 'status'

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation/git-update-index.txt patch | blob | history
builtin/update-index.c patch | blob | history
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index aff01798cdf6b114009eae8dfc4f2866a8a24d17..6bc296787e99f1e5fee159a99aba89f6035b6265 100644 (file)
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -170,6 +170,14 @@ may not support it yet.
        the shared index file. This mode is designed for very large
        indexes that take a significant amount of time to read or write.
 
+--untracked-cache::
+--no-untracked-cache::
+       Enable or disable untracked cache extension. This could speed
+       up for commands that involve determining untracked files such
+       as `git status`. The underlying operating system and file
+       system must change `st_mtime` field of a directory if files
+       are added or deleted in that directory.
+
 \--::
        Do not interpret any more arguments as options.
 
diff --git a/builtin/update-index.c b/builtin/update-index.c
index 587898624c0550749a9a241e2742785f20ec1bd5..6ea5c8dc205db06f076cf366a299e4ca97b34d8c 100644 (file)
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -741,6 +741,7 @@ static int reupdate_callback(struct parse_opt_ctx_t *ctx,
 int cmd_update_index(int argc, const char **argv, const char *prefix)
 {
        int newfd, entries, has_errors = 0, line_termination = '\n';
+       int untracked_cache = -1;
        int read_from_stdin = 0;
        int prefix_length = prefix ? strlen(prefix) : 0;
        int preferred_index_format = 0;
@@ -832,6 +833,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
                        N_("write index in this format")),
                OPT_BOOL(0, "split-index", &split_index,
                        N_("enable or disable split index")),
+               OPT_BOOL(0, "untracked-cache", &untracked_cache,
+                       N_("enable/disable untracked cache")),
                OPT_END()
        };
 
@@ -938,6 +941,19 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
                the_index.split_index = NULL;
                the_index.cache_changed |= SOMETHING_CHANGED;
        }
+       if (untracked_cache > 0 && !the_index.untracked) {
+               struct untracked_cache *uc;
+
+               uc = xcalloc(1, sizeof(*uc));
+               uc->exclude_per_dir = ".gitignore";
+               /* should be the same flags used by git-status */
+               uc->dir_flags = DIR_SHOW_OTHER_DIRECTORIES | DIR_HIDE_EMPTY_DIRECTORIES;
+               the_index.untracked = uc;
+               the_index.cache_changed |= UNTRACKED_CHANGED;
+       } else if (!untracked_cache && the_index.untracked) {
+               the_index.untracked = NULL;
+               the_index.cache_changed |= UNTRACKED_CHANGED;
+       }
 
        if (active_cache_changed) {
                if (newfd < 0) {