From: "Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>
To: pclouds@gmail.com
Cc: Ben.Peart@microsoft.com, git@vger.kernel.org, gitster@pobox.com,
peartben@gmail.com, peff@peff.net
Subject: [PATCH v3 0/4] Speed up unpack_trees()
Date: Sat, 4 Aug 2018 07:37:19 +0200 [thread overview]
Message-ID: <20180804053723.4695-1-pclouds@gmail.com> (raw)
In-Reply-To: <20180729103306.16403-1-pclouds@gmail.com>
This is a minor update to address Ben's comments and add his
measurements in the commit message of 2/4 for the record.
I've also checked about the lookahead thing in unpack_trees() to see
if we accidentally break something there, which is my biggest worry.
See [1] and [2] for context, but I believe since we can't have D/F
conflicts, the situation where lookahead is needed will not occur. So
we should be safe.
[1] da165f470e (unpack-trees.c: prepare for looking ahead in the index - 2010-01-07)
[2] 730f72840c (unpack-trees.c: look ahead in the index - 2009-09-20)
range-diff:
1: 789f7e2872 ! 1: 05eb762d2d unpack-trees.c: add performance tracing
@@ -1,6 +1,6 @@
Author: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
- unpack-trees.c: add performance tracing
+ unpack-trees: add performance tracing
We're going to optimize unpack_trees() a bit in the following
patches. Let's add some tracing to measure how long it takes before
2: 589bed1366 ! 2: 02286ad123 unpack-trees: optimize walking same trees with cache-tree
@@ -32,6 +32,24 @@
0.111793866 0.032933140 s: diff-index
0.587933288 0.398924370 s: git command: /home/pclouds/w/git/git
+ Another measurement from Ben's running "git checkout" with over 500k
+ trees (on the whole series):
+
+ baseline new
+ ----------------------------------------------------------------------
+ 0.535510167 0.556558733 s: read cache .git/index
+ 0.3057373 0.3147105 s: initialize name hash
+ 0.0184082 0.023558433 s: preload index
+ 0.086910967 0.089085967 s: refresh index
+ 7.889590767 2.191554433 s: unpack trees
+ 0.120760833 0.131941267 s: update worktree after a merge
+ 2.2583504 2.572663167 s: repair cache-tree
+ 0.8916137 0.959495233 s: write index, changed mask = 28
+ 3.405199233 0.2710663 s: unpack trees
+ 0.000999667 0.0021554 s: update worktree after a merge
+ 3.4063306 0.273318333 s: diff-index
+ 16.9524923 9.462943133 s: git command: git.exe checkout
+
This command calls unpack_trees() twice, the first time on 2way merge
and the second 1way merge. In both times, "unpack trees" time is
reduced to one third. Overall time reduction is not that impressive of
@@ -39,7 +57,6 @@
repair cache-tree line.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
- Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/unpack-trees.c b/unpack-trees.c
--- a/unpack-trees.c
@@ -170,7 +187,7 @@
}
+/*
-+ * Note that traverse_by_cache_tree() duplicates some logic in this funciton
++ * Note that traverse_by_cache_tree() duplicates some logic in this function
+ * without actually calling it. If you change the logic here you may need to
+ * check and change there as well.
+ */
@@ -189,12 +206,3 @@
static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
{
struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
-@@
- uint64_t start = getnanotime();
-
- if (len > MAX_UNPACK_TREES)
-- die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
-+ die(_("unpack_trees takes at most %d trees"), MAX_UNPACK_TREES);
-
- memset(&el, 0, sizeof(el));
- if (!core_apply_sparse_checkout || !o->update)
3: 7c6f863fc0 = 3: c87b82ffee unpack-trees: reduce malloc in cache-tree walk
4: 6ca17b1138 ! 4: e791cdfc82 unpack-trees: cheaper index update when walking by cache-tree
@@ -40,7 +40,6 @@
attempt should be on that "repair cache-tree" line.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
- Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/cache.h b/cache.h
--- a/cache.h
@@ -119,20 +118,6 @@
free(tree_ce);
if (o->debug_unpack)
printf("Unpacked %d entries from %s to %s using cache-tree\n",
-@@
- if (!ret) {
- if (!o->result.cache_tree)
- o->result.cache_tree = cache_tree();
-+ /*
-+ * TODO: Walk o.src_index->cache_tree, quickly check
-+ * if o->result.cache has the exact same content for
-+ * any valid cache-tree in o.src_index, then we can
-+ * just copy the cache-tree over instead of hashing a
-+ * new tree object.
-+ */
- if (!cache_tree_fully_valid(o->result.cache_tree))
- cache_tree_update(&o->result,
- WRITE_TREE_SILENT |
diff --git a/unpack-trees.h b/unpack-trees.h
--- a/unpack-trees.h
Nguyễn Thái Ngọc Duy (4):
unpack-trees: add performance tracing
unpack-trees: optimize walking same trees with cache-tree
unpack-trees: reduce malloc in cache-tree walk
unpack-trees: cheaper index update when walking by cache-tree
cache-tree.c | 2 +
cache.h | 1 +
read-cache.c | 3 +-
unpack-trees.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++
unpack-trees.h | 1 +
5 files changed, 158 insertions(+), 1 deletion(-)
--
2.18.0.656.gda699b98b3
next prev parent reply other threads:[~2018-08-04 5:37 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 20:45 [PATCH v1 0/3] [RFC] Speeding up checkout (and merge, rebase, etc) Ben Peart
2018-07-18 20:45 ` [PATCH v1 1/3] add unbounded Multi-Producer-Multi-Consumer queue Ben Peart
2018-07-18 20:57 ` Stefan Beller
2018-07-19 19:11 ` Junio C Hamano
2018-07-18 20:45 ` [PATCH v1 2/3] add performance tracing around traverse_trees() in unpack_trees() Ben Peart
2018-07-18 20:45 ` [PATCH v1 3/3] Add initial parallel version of unpack_trees() Ben Peart
2018-07-18 22:56 ` Junio C Hamano
2018-07-18 21:02 ` [PATCH v1 0/3] [RFC] Speeding up checkout (and merge, rebase, etc) Stefan Beller
2018-07-18 21:34 ` Jeff King
2018-07-23 15:48 ` Ben Peart
2018-07-23 17:03 ` Duy Nguyen
2018-07-23 20:51 ` Ben Peart
2018-07-24 4:20 ` Jeff King
2018-07-24 15:33 ` Duy Nguyen
2018-07-25 20:56 ` Ben Peart
2018-07-26 5:30 ` Duy Nguyen
2018-07-26 16:30 ` Duy Nguyen
2018-07-26 19:40 ` Junio C Hamano
2018-07-27 15:42 ` Duy Nguyen
2018-07-27 16:22 ` Ben Peart
2018-07-27 18:00 ` Duy Nguyen
2018-07-27 17:14 ` Junio C Hamano
2018-07-27 17:52 ` Duy Nguyen
2018-07-29 6:24 ` Duy Nguyen
2018-07-29 10:33 ` [PATCH v2 0/4] Speed up unpack_trees() Nguyễn Thái Ngọc Duy
2018-07-29 10:33 ` [PATCH v2 1/4] unpack-trees.c: add performance tracing Nguyễn Thái Ngọc Duy
2018-07-30 20:16 ` Ben Peart
2018-07-29 10:33 ` [PATCH v2 2/4] unpack-trees: optimize walking same trees with cache-tree Nguyễn Thái Ngọc Duy
2018-07-30 20:52 ` Ben Peart
2018-07-29 10:33 ` [PATCH v2 3/4] unpack-trees: reduce malloc in cache-tree walk Nguyễn Thái Ngọc Duy
2018-07-30 20:58 ` Ben Peart
2018-07-29 10:33 ` [PATCH v2 4/4] unpack-trees: cheaper index update when walking by cache-tree Nguyễn Thái Ngọc Duy
2018-08-08 18:46 ` Elijah Newren
2018-08-10 16:39 ` Duy Nguyen
2018-08-10 18:39 ` Elijah Newren
2018-08-10 19:30 ` Duy Nguyen
2018-08-10 19:40 ` Elijah Newren
2018-08-10 19:48 ` Duy Nguyen
2018-07-30 18:10 ` [PATCH v2 0/4] Speed up unpack_trees() Ben Peart
2018-07-31 15:31 ` Duy Nguyen
2018-07-31 16:50 ` Ben Peart
2018-07-31 17:31 ` Ben Peart
2018-08-01 16:38 ` Duy Nguyen
2018-08-08 20:53 ` Ben Peart
2018-08-09 8:16 ` Ben Peart
2018-08-10 16:08 ` Duy Nguyen
2018-08-10 15:51 ` Duy Nguyen
2018-07-30 21:04 ` Ben Peart
2018-08-04 5:37 ` Nguyễn Thái Ngọc Duy [this message]
2018-08-04 5:37 ` [PATCH v3 1/4] unpack-trees: add performance tracing Nguyễn Thái Ngọc Duy
2018-08-04 5:37 ` [PATCH v3 2/4] unpack-trees: optimize walking same trees with cache-tree Nguyễn Thái Ngọc Duy
2018-08-08 18:23 ` Elijah Newren
2018-08-10 16:29 ` Duy Nguyen
2018-08-10 18:48 ` Elijah Newren
2018-08-04 5:37 ` [PATCH v3 3/4] unpack-trees: reduce malloc in cache-tree walk Nguyễn Thái Ngọc Duy
2018-08-08 18:30 ` Elijah Newren
2018-08-04 5:37 ` [PATCH v3 4/4] unpack-trees: cheaper index update when walking by cache-tree Nguyễn Thái Ngọc Duy
2018-08-06 15:48 ` [PATCH v3 0/4] Speed up unpack_trees() Junio C Hamano
2018-08-06 15:59 ` Duy Nguyen
2018-08-06 18:59 ` Junio C Hamano
2018-08-08 17:00 ` Ben Peart
2018-08-08 17:46 ` Junio C Hamano
2018-08-08 18:12 ` Junio C Hamano
2018-08-08 18:39 ` Junio C Hamano
2018-08-10 16:53 ` Duy Nguyen
2018-08-12 8:15 ` [PATCH v4 0/5] " Nguyễn Thái Ngọc Duy
2018-08-12 8:15 ` [PATCH v4 1/5] trace.h: support nested performance tracing Nguyễn Thái Ngọc Duy
2018-08-13 18:39 ` Ben Peart
2018-08-12 8:15 ` [PATCH v4 2/5] unpack-trees: add " Nguyễn Thái Ngọc Duy
2018-08-12 10:05 ` Thomas Adam
2018-08-13 18:50 ` Junio C Hamano
2018-08-13 18:44 ` Ben Peart
2018-08-13 19:25 ` Jeff King
2018-08-13 19:36 ` Stefan Beller
2018-08-13 20:11 ` Ben Peart
2018-08-13 19:52 ` Duy Nguyen
2018-08-13 21:47 ` Jeff King
2018-08-13 22:41 ` Junio C Hamano
2018-08-14 18:19 ` Jeff Hostetler
2018-08-14 18:32 ` Duy Nguyen
2018-08-14 18:44 ` Stefan Beller
2018-08-14 18:51 ` Duy Nguyen
2018-08-14 19:54 ` Jeff King
2018-08-14 20:52 ` Junio C Hamano
2018-08-15 16:32 ` Duy Nguyen
2018-08-15 18:28 ` Junio C Hamano
2018-08-14 20:14 ` Jeff Hostetler
2018-08-12 8:15 ` [PATCH v4 3/5] unpack-trees: optimize walking same trees with cache-tree Nguyễn Thái Ngọc Duy
2018-08-13 18:58 ` Ben Peart
2018-08-15 16:38 ` Duy Nguyen
2018-08-12 8:15 ` [PATCH v4 4/5] unpack-trees: reduce malloc in cache-tree walk Nguyễn Thái Ngọc Duy
2018-08-12 8:15 ` [PATCH v4 5/5] unpack-trees: reuse (still valid) cache-tree from src_index Nguyễn Thái Ngọc Duy
2018-08-13 15:48 ` Elijah Newren
2018-08-13 15:57 ` Duy Nguyen
2018-08-13 16:05 ` Ben Peart
2018-08-13 16:25 ` Duy Nguyen
2018-08-13 17:15 ` Ben Peart
2018-08-13 19:01 ` [PATCH v4 0/5] Speed up unpack_trees() Junio C Hamano
2018-08-14 19:19 ` Ben Peart
2018-08-18 14:41 ` [PATCH v5 0/7] " Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 1/7] trace.h: support nested performance tracing Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 2/7] unpack-trees: add " Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 3/7] unpack-trees: optimize walking same trees with cache-tree Nguyễn Thái Ngọc Duy
2018-08-20 12:43 ` Ben Peart
2018-08-18 14:41 ` [PATCH v5 4/7] unpack-trees: reduce malloc in cache-tree walk Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 5/7] unpack-trees: reuse (still valid) cache-tree from src_index Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 6/7] unpack-trees: add missing cache invalidation Nguyễn Thái Ngọc Duy
2018-08-18 14:41 ` [PATCH v5 7/7] cache-tree: verify valid cache-tree in the test suite Nguyễn Thái Ngọc Duy
2018-08-18 21:45 ` Elijah Newren
2018-08-18 22:01 ` [PATCH v5 0/7] Speed up unpack_trees() Elijah Newren
2018-08-19 5:09 ` Duy Nguyen
2018-08-25 12:18 ` [PATCH] Document update for nd/unpack-trees-with-cache-tree Nguyễn Thái Ngọc Duy
2018-08-25 12:31 ` Martin Ågren
2018-08-25 13:02 ` [PATCH v2] " Nguyễn Thái Ngọc Duy
2018-07-27 15:50 ` [PATCH v1 0/3] [RFC] Speeding up checkout (and merge, rebase, etc) Ben Peart
2018-07-26 16:35 ` Duy Nguyen
2018-07-24 5:54 ` Junio C Hamano
2018-07-24 15:13 ` Duy Nguyen
2018-07-24 21:21 ` Jeff King
2018-07-25 16:09 ` Ben Peart
2018-07-24 4:27 ` Jeff King
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