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From: Matheus Tavares <matheus.bernardino@usp.br>
To: git@vger.kernel.org
Cc: christian.couder@gmail.com, olyatelezhnaya@gmail.com,
	pclouds@gmail.com, gitster@pobox.com, jrnieder@gmail.com,
	Rasmus Villemoes <rv@rasmusvillemoes.dk>,
	Jeff King <peff@peff.net>
Subject: [PATCH v2 11/11] grep: move driver pre-load out of critical section
Date: Sun, 29 Sep 2019 22:50:57 -0300
Message-ID: <7b0358d1596e6673d12f9592cf05f5193247f3ec.1569808052.git.matheus.bernardino@usp.br> (raw)
In-Reply-To: <cover.1569808052.git.matheus.bernardino@usp.br>

In builtin/grep.c:add_work() we pre-load the userdiff drivers before
adding the grep_source in the todo list. This operation is currently
being performed after acquiring the grep_mutex, but as it's already
thread-safe, we don't need to protect it here. So let's move it out of
the critical section which should avoid thread contention and improve
performance.

Running[1] `git grep --threads=8 abcd[02] HEAD` on chromium's
repository[2], I got the following mean times for 30 executions after 2
warmups:

        Original         |  6.2886s
-------------------------|-----------
 Out of critical section |  5.7852s

[1]: Tests performed on an i7-7700HQ with 16GB of RAM and SSD, running
     Manjaro Linux.
[2]: chromium’s repo at commit 03ae96f (“Add filters testing at DSF=2”,
         04-06-2019), after a 'git gc' execution.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
---
 builtin/grep.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index 163f14b60d..d275b76647 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -92,8 +92,11 @@ static pthread_cond_t cond_result;
 
 static int skip_first_line;
 
-static void add_work(struct grep_opt *opt, const struct grep_source *gs)
+static void add_work(struct grep_opt *opt, struct grep_source *gs)
 {
+	if (opt->binary != GREP_BINARY_TEXT)
+		grep_source_load_driver(gs, opt->repo->index);
+
 	grep_lock();
 
 	while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
@@ -101,9 +104,6 @@ static void add_work(struct grep_opt *opt, const struct grep_source *gs)
 	}
 
 	todo[todo_end].source = *gs;
-	if (opt->binary != GREP_BINARY_TEXT)
-		grep_source_load_driver(&todo[todo_end].source,
-					opt->repo->index);
 	todo[todo_end].done = 0;
 	strbuf_reset(&todo[todo_end].out);
 	todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
-- 
2.23.0


      parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-10 20:27 [GSoC][PATCH 0/4] grep: re-enable threads when cached, w/ parallel inflation Matheus Tavares
2019-08-10 20:27 ` [GSoC][PATCH 1/4] object-store: add lock to read_object_file_extended() Matheus Tavares
2019-08-10 20:27 ` [GSoC][PATCH 2/4] grep: allow locks to be enabled individually Matheus Tavares
2019-08-10 20:27 ` [GSoC][PATCH 3/4] grep: disable grep_read_mutex when possible Matheus Tavares
2019-08-10 20:27 ` [GSoC][PATCH 4/4] grep: re-enable threads in some non-worktree cases Matheus Tavares
2019-09-30  1:50 ` [PATCH v2 00/11] grep: improve threading and fix race conditions Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 01/11] grep: fix race conditions on userdiff calls Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 02/11] grep: fix race conditions at grep_submodule() Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 03/11] grep: fix racy calls in grep_objects() Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 04/11] replace-object: make replace operations thread-safe Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 05/11] object-store: allow threaded access to object reading Matheus Tavares
2019-11-12  2:54     ` Jonathan Tan
2019-11-13  5:20       ` Jeff King
2019-11-14  5:57         ` Matheus Tavares Bernardino
2019-11-14  6:01           ` Jeff King
2019-11-14 18:15             ` Jonathan Tan
2019-11-15  4:12               ` Jeff King
2019-09-30  1:50   ` [PATCH v2 06/11] grep: replace grep_read_mutex by internal obj read lock Matheus Tavares
2019-10-01 19:23     ` [PATCH] squash! " Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 07/11] submodule-config: add skip_if_read option to repo_read_gitmodules() Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 08/11] grep: allow submodule functions to run in parallel Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 09/11] grep: protect packed_git [re-]initialization Matheus Tavares
2019-09-30  1:50   ` [PATCH v2 10/11] grep: re-enable threads in non-worktree case Matheus Tavares
2019-09-30  1:50   ` Matheus Tavares [this message]

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