From patchwork Wed Apr 14 19:14:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Rafael Silva X-Patchwork-Id: 12203599 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 725A9C43460 for ; Wed, 14 Apr 2021 19:15:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44DAC61220 for ; Wed, 14 Apr 2021 19:15:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353220AbhDNTPe (ORCPT ); Wed, 14 Apr 2021 15:15:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352685AbhDNTPb (ORCPT ); Wed, 14 Apr 2021 15:15:31 -0400 Received: from mail-ej1-x629.google.com (mail-ej1-x629.google.com [IPv6:2a00:1450:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DC52C061756 for ; Wed, 14 Apr 2021 12:15:09 -0700 (PDT) Received: by mail-ej1-x629.google.com with SMTP id w3so33118398ejc.4 for ; Wed, 14 Apr 2021 12:15:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=echYCociiTf862YPNWC7ZjpOg4edVypXWw6+pwt1WvM=; b=YMrumJ1NrGPCNOENXbnvdl0U7+K0n9oDWD6JQx/ld+o7dLbwbZdhYoFLKv0GARhoXy qRQjQWJ2sym6+lsAg1Qaokxwr1WXpNfN1QA4SLqKlzcAMJOjMzrHQfc1rc5HNzffvQ2C PeaWJjp6wc2rVbUv8RN/XtmfDftpCyo4fHT0Wb4rB6x/GEqhmu1KS8A9yeUfQq0qmER6 dIyuagd5L1S8EKG9ddB0nBxYN6DBMvDNf8pXH9a9GG1Sny9bQw1OQBeLJeCTArHR03Ym 8XLgwllPgvi8HNgJbiSysJ/4T/cmfxbombr0EpeAfSNYBjPA4Kr0U5ozWu5OgEHRZVvv LnfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=echYCociiTf862YPNWC7ZjpOg4edVypXWw6+pwt1WvM=; b=XWjr5b1vAK3iLsmBE7mO0N4Za9kEkIspBDlp3a1f8LeIzjbW7lIJQ5iSbFpOynWSyW eITAP1ur/lSuFWlpHx6jFG1MZr2vCGX3Sjdmyeqom2Bl+DnfcJ+NxsBIFubsWgyn4PpY RjSZH+YqPMjvNnyFK8FasgsHTeOdJCMyWTWeshZyg/gnzxTVzIobkArccpdF3ew1UTs5 LtacOooxm6Ie1OLhRyeC1AaohObVDZ2FH2sRMpNyOvY1f5Fyq18hKA+apwSF13y5IVrx QT+5Nybe/CDZnnmM4MjwEncp6bb0e8eeKb0NVZt+Us70JzVy9knVB8vCYWzSn+hL+VuI FoSw== X-Gm-Message-State: AOAM530buFsM5cGtTuz5x/ZRksgkl3BHO/nm21DBdR7Lg8nxkkTYDMbQ PavGKUwkduTznyEZYLQn2pgUjM+gkdPnS4wH X-Google-Smtp-Source: ABdhPJxu5tp570R0+YgRS/T0ea1ImB90uEd4496GAJtKGGuzRn5rkPiqm/aYPTorG1enGFuZs/u/mg== X-Received: by 2002:a17:907:98ae:: with SMTP id ju14mr379210ejc.287.1618427707225; Wed, 14 Apr 2021 12:15:07 -0700 (PDT) Received: from localhost.localdomain ([212.86.35.110]) by smtp.gmail.com with ESMTPSA id cq26sm363547edb.60.2021.04.14.12.15.06 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Apr 2021 12:15:06 -0700 (PDT) From: Rafael Silva To: git@vger.kernel.org Cc: =?utf-8?q?SZEDER_G=C3=A1bor?= , Jeff King , Jonathan Tan , Rafael Silva Subject: [PATCH 2/2] repack: avoid loosening promisor pack objects in partial clones Date: Wed, 14 Apr 2021 21:14:03 +0200 Message-Id: <20210414191403.4387-3-rafaeloliveira.cs@gmail.com> X-Mailer: git-send-email 2.31.0.565.gcc42f43761 In-Reply-To: <20210414191403.4387-1-rafaeloliveira.cs@gmail.com> References: <20210403090412.GH2271@szeder.dev> <20210414191403.4387-1-rafaeloliveira.cs@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org When `-A` and `-d` are used together, besides packing all objects (-A) and removing redundant packs (-d), it also unpack all unreachable objects and deletes them by calling `git pruned-packed`. For a partial clone, that contains unreferenced objects, this results in unpacking all "promisor" objects and deleting them right after, which unnecessarily increases the `repack` execution time and disk usage during the unpacking of the objects. For instance, a partially cloned repository that filters all the blob objects (e.g. "--filter=blob:none"), `repack` ends up unpacking all blobs into the filesystem that, depending on the repo size, makes nearly impossible to repack the operation before running out of disk. For a partial clone, `git repack` calls `git pack-objects` twice: (1) for handle the "promisor" objects and (2) for performing the repack with --exclude-promisor-objects option, that results in unpacking and deleting of the objects. Given that we actually should keep the promisor objects, let's teach `repack` to tell `pack-objects` to --keep the old "promisor" pack file. The --keep-pack option takes only a packfile name, but we concatenate both the path and the name in a single string. Instead, let's split them into separate string in order to easily pass the packfile name later. Additionally, add a new perf test to evaluate the performance impact made by this changes (tested on git.git): Test HEAD^ HEAD ------------------------------------------------------------ 5600.5: gc 137.67(42.48+93.64) 8.08(6.91+1.45) -94.1% In this particular script, the improvement is big because every object in the newly-cloned partial repository is a promisor object. Reported-by: SZEDER Gábor Helped-by: Jeff King Signed-off-by: Rafael Silva --- builtin/repack.c | 9 +++++++-- t/perf/p5600-partial-clone.sh | 4 ++++ t/t5616-partial-clone.sh | 9 +++++++++ 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/builtin/repack.c b/builtin/repack.c index 6baaeb979c..0ecd76b79c 100644 --- a/builtin/repack.c +++ b/builtin/repack.c @@ -20,7 +20,7 @@ static int delta_base_offset = 1; static int pack_kept_objects = -1; static int write_bitmaps = -1; static int use_delta_islands; -static char *packdir, *packtmp; +static char *packdir, *packtmp_name, *packtmp; static const char *const git_repack_usage[] = { N_("git repack []"), @@ -533,7 +533,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix) } packdir = mkpathdup("%s/pack", get_object_directory()); - packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid()); + packtmp_name = xstrfmt(".tmp-%d-pack", (int)getpid()); + packtmp = mkpathdup("%s/%s", packdir, packtmp_name); sigchain_push_common(remove_pack_on_signal); @@ -576,6 +577,10 @@ int cmd_repack(int argc, const char **argv, const char *prefix) repack_promisor_objects(&po_args, &names); if (existing_packs.nr && delete_redundant) { + for_each_string_list_item(item, &names) { + strvec_pushf(&cmd.args, "--keep-pack=%s-%s.pack", + packtmp_name, item->string); + } if (unpack_unreachable) { strvec_pushf(&cmd.args, "--unpack-unreachable=%s", diff --git a/t/perf/p5600-partial-clone.sh b/t/perf/p5600-partial-clone.sh index ca785a3341..a965f2c4d6 100755 --- a/t/perf/p5600-partial-clone.sh +++ b/t/perf/p5600-partial-clone.sh @@ -35,4 +35,8 @@ test_perf 'count non-promisor commits' ' git -C bare.git rev-list --all --count --exclude-promisor-objects ' +test_perf 'gc' ' + git -C bare.git gc +' + test_done diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh index 5cb415386e..de77822735 100755 --- a/t/t5616-partial-clone.sh +++ b/t/t5616-partial-clone.sh @@ -548,6 +548,15 @@ test_expect_success 'fetch from a partial clone, protocol v2' ' grep "version 2" trace ' +test_expect_success 'repack does not loose all objects' ' + rm -rf client && + git clone --bare --filter=blob:none "file://$(pwd)/srv.bare" client && + test_when_finished "rm -rf client" && + git -C client repack -A -l -d --no-prune-packed && + git -C client count-objects -v >object-count && + grep "^prune-packable: 0" object-count +' + . "$TEST_DIRECTORY"/lib-httpd.sh start_httpd