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From: Glen Choo <chooglen@google.com>
To: git@vger.kernel.org
Cc: Glen Choo <chooglen@google.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Junio C Hamano <gitster@pobox.com>,
	Jiang Xin <worldhello.net@gmail.com>
Subject: [PATCH v7 2/3] fetch: skip tasks related to fetching objects
Date: Thu, 20 Jan 2022 09:49:41 -0800	[thread overview]
Message-ID: <20220120174942.94231-3-chooglen@google.com> (raw)
In-Reply-To: <20220120174942.94231-1-chooglen@google.com>

cmd_fetch() does the following with the assumption that objects are
fetched:

* Run gc
* Write commit graphs (if enabled by fetch.writeCommitGraph=true)

However, neither of these tasks makes sense if objects are not fetched
e.g. `git fetch --negotiate-only` never fetches objects.

Speed up cmd_fetch() by bailing out early if we know for certain that
objects will not be fetched. cmd_fetch() can bail out early whenever
objects are not fetched, but for now this only considers
--negotiate-only.

The same optimization does not apply to `git fetch --dry-run` because
that actually fetches objects; the dry run refers to not updating refs.

Signed-off-by: Glen Choo <chooglen@google.com>
---
 builtin/fetch.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 0a625cb137..7bbff5a029 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -2152,6 +2152,17 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 		strvec_clear(&options);
 	}
 
+	/*
+	 * Skip irrelevant tasks because we know objects were not
+	 * fetched.
+	 *
+	 * NEEDSWORK: as a future optimization, we can return early
+	 * whenever objects were not fetched e.g. if we already have all
+	 * of them.
+	 */
+	if (negotiate_only)
+		goto cleanup;
+
 	prepare_repo_settings(the_repository);
 	if (fetch_write_commit_graph > 0 ||
 	    (fetch_write_commit_graph < 0 &&
-- 
2.33.GIT


  parent reply	other threads:[~2022-01-20 17:49 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-07 19:29 [PATCH] builtin/fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2021-12-09 22:12 ` Jonathan Tan
2021-12-09 22:36   ` Glen Choo
2021-12-13 22:58     ` Jonathan Tan
2021-12-16 18:11       ` Glen Choo
2021-12-17  0:02 ` [PATCH v2] " Glen Choo
2021-12-17 23:35   ` Junio C Hamano
2021-12-20 19:37     ` Glen Choo
2021-12-20 19:56       ` Junio C Hamano
2021-12-20 20:54         ` Glen Choo
2021-12-20 22:12           ` Junio C Hamano
2021-12-21  0:18             ` Glen Choo
2021-12-21 23:07       ` Glen Choo
2021-12-22  0:11   ` [PATCH v3 0/3] " Glen Choo
2021-12-22  0:11     ` [PATCH v3 1/3] builtin/fetch: use goto cleanup in cmd_fetch() Glen Choo
2021-12-22  0:11     ` [PATCH v3 2/3] builtin/fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2021-12-22  6:42       ` Junio C Hamano
2021-12-22 17:28         ` Glen Choo
2021-12-22 19:29           ` Junio C Hamano
2021-12-22 20:27             ` Glen Choo
2021-12-22  0:11     ` [PATCH v3 3/3] builtin/fetch: die on --negotiate-only and --recurse-submodules Glen Choo
2021-12-22  6:46       ` Junio C Hamano
2021-12-23 19:08       ` Jonathan Tan
2022-01-13  0:44     ` [PATCH v4 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-13  0:44       ` [PATCH v4 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-13  0:45       ` [PATCH v4 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-13  0:45       ` [PATCH v4 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-13  1:16         ` Junio C Hamano
2022-01-18 18:54       ` [PATCH v5 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-18 18:54         ` [PATCH v5 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-18 18:54         ` [PATCH v5 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-18 18:54         ` [PATCH v5 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-18 22:05           ` Junio C Hamano
2022-01-18 23:41             ` Glen Choo
2022-01-19  0:26               ` Junio C Hamano
2022-01-19  0:00         ` [PATCH v6 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-19  0:00           ` [PATCH v6 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-19  0:00           ` [PATCH v6 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-19  0:00           ` [PATCH v6 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-20  2:38             ` Jiang Xin
2022-01-20 17:40               ` Glen Choo
2022-01-20 17:49           ` [PATCH v7 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-20 17:49             ` [PATCH v7 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-20 17:49             ` Glen Choo [this message]
2022-01-20 17:49             ` [PATCH v7 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-20 23:08               ` Junio C Hamano
2022-01-20 23:16                 ` Glen Choo
2022-01-20 21:58             ` Re* [PATCH v7 0/3] fetch: skip unnecessary tasks when using --negotiate-only Junio C Hamano
2022-01-20 23:15               ` Glen Choo
2022-01-21  2:17               ` Jiang Xin

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