From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.7 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,URIBL_BLOCKED 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 6F5AEC433DB for ; Wed, 10 Feb 2021 15:17:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 458DF64E7C for ; Wed, 10 Feb 2021 15:17:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231947AbhBJPRF (ORCPT ); Wed, 10 Feb 2021 10:17:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231894AbhBJPQb (ORCPT ); Wed, 10 Feb 2021 10:16:31 -0500 Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73C80C061786 for ; Wed, 10 Feb 2021 07:15:50 -0800 (PST) Received: by mail-wm1-x32e.google.com with SMTP id o15so340567wmq.5 for ; Wed, 10 Feb 2021 07:15:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:in-reply-to:references:from:date:subject:mime-version :content-transfer-encoding:fcc:to:cc; bh=mlzyN6EN09cYDXnT25zJbM8VpmYb8hGqkzmMpJxXOqY=; b=V4PwWNdEZMoXurKFJyLeb43EiJ+RawVrrvMAARJEUflY15+PeVeST+T/QGFZghzKYi ij3uHFNMpnbgtIr00lqNJpF7q61VF4h73p8hsxmCPYlHeqZQktPbB55mn4Sog0+biedU B44RZEmLM0Q5Sq6WPbLkz4zeWeuNPMuKVXIglCVQzgMoAo1deXlwYB5iatSKtkUAh8n9 ZivohiaF8zbGKicbi35ZJz0LEf1MhqBmJ/RgItFueMrEz0fJpQ8dBcei5jyjBVzy+SvN pQ6L1v0KYSZjWThZ8r1wfD5RSGv7c/fa4qu4ThxqFpFChKUfLZ7jP6AqljhXDYcxhGNr WC8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:mime-version:content-transfer-encoding:fcc:to:cc; bh=mlzyN6EN09cYDXnT25zJbM8VpmYb8hGqkzmMpJxXOqY=; b=bx1w4H7bt/HUW/Tw/Aj8l3kU1zSvfDNyLuq7ugCq7CmZAdZm+nE84V4XMCwhz+uxm4 SDcWYV8AW4RFWaGfrc9nSF58UnMLwMR1cgIynmCryVIhaPfGYb+9as4P3G6RZa6a+sjk 1PYCLm2hM7n/hQjAaKSS9N5Jk2nwWHgjGDfUQp2FlBDzGYIHm8TDDtizgWuEu/CJea8C MZX6h/aZdRRJ8LzFAqO2KNXlSWmKjBGQsH9cXfsDpBdjMh88b8VXdPl3blCumHB5qT5U vpAXK6sFsR5EhcDVlQSmq02U16Ykfaoi0y0oCPvvm/hnCwZG8bnoYat001HuFxbbZ7FP eMyw== X-Gm-Message-State: AOAM53172/M0aWsNTs8Ap7zeRXqzcqv+VoF/IZfMt2Omqd/M6DdQeNZ/ FsK8VVJb3KHziI+umncjEnCzFvt9chY= X-Google-Smtp-Source: ABdhPJyQq5svG6Ifbtbn/Ntc/JD5CMLJUm859LE9BpDGg8p+86Pze/3psoH6iBuM0sSopO4nvG20QA== X-Received: by 2002:a1c:29c6:: with SMTP id p189mr3404453wmp.110.1612970149209; Wed, 10 Feb 2021 07:15:49 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id p12sm2557272wmq.1.2021.02.10.07.15.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Feb 2021 07:15:48 -0800 (PST) Message-Id: <2493f4b2f55d2b602e448db3f09da1ee3a97c81b.1612970140.git.gitgitgadget@gmail.com> In-Reply-To: References: From: "Elijah Newren via GitGitGadget" Date: Wed, 10 Feb 2021 15:15:39 +0000 Subject: [PATCH v3 4/5] diffcore-rename: guide inexact rename detection based on basenames MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fcc: Sent To: git@vger.kernel.org Cc: Derrick Stolee , Jonathan Tan , Taylor Blau , Junio C Hamano , Jeff King , Elijah Newren , Derrick Stolee , Elijah Newren , Elijah Newren Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Elijah Newren Make use of the new find_basename_matches() function added in the last two patches, to find renames more rapidly in cases where we can match up files based on basenames. As a quick reminder (see the last two commit messages for more details), this means for example that docs/extensions.txt and docs/config/extensions.txt are considered likely renames if there are no 'extensions.txt' files elsewhere among the added and deleted files, and if a similarity check confirms they are similar, then they are marked as a rename without looking for a better similarity match among other files. This is a behavioral change, as covered in more detail in the previous commit message. We do not use this heuristic together with either break or copy detection. The point of break detection is to say that filename similarity does not imply file content similarity, and we only want to know about file content similarity. The point of copy detection is to use more resources to check for additional similarities, while this is an optimization that uses far less resources but which might also result in finding slightly fewer similarities. So the idea behind this optimization goes against both of those features, and will be turned off for both. For the testcases mentioned in commit 557ac0350d ("merge-ort: begin performance work; instrument with trace2_region_* calls", 2020-10-28), this change improves the performance as follows: Before After no-renames: 13.815 s ± 0.062 s 13.294 s ± 0.103 s mega-renames: 1799.937 s ± 0.493 s 187.248 s ± 0.882 s just-one-mega: 51.289 s ± 0.019 s 5.557 s ± 0.017 s Signed-off-by: Elijah Newren --- diffcore-rename.c | 54 ++++++++++++++++++++++++++++++++++++++---- t/t4001-diff-rename.sh | 4 ++-- 2 files changed, 51 insertions(+), 7 deletions(-) diff --git a/diffcore-rename.c b/diffcore-rename.c index 001645624e71..df76e475c710 100644 --- a/diffcore-rename.c +++ b/diffcore-rename.c @@ -379,7 +379,6 @@ static const char *get_basename(const char *filename) return base ? base + 1 : filename; } -MAYBE_UNUSED static int find_basename_matches(struct diff_options *options, int minimum_score, int num_src) @@ -727,12 +726,57 @@ void diffcore_rename(struct diff_options *options) if (minimum_score == MAX_SCORE) goto cleanup; + num_sources = rename_src_nr; + + if (want_copies || break_idx) { + /* + * Cull sources: + * - remove ones corresponding to exact renames + */ + trace2_region_enter("diff", "cull after exact", options->repo); + remove_unneeded_paths_from_src(want_copies); + trace2_region_leave("diff", "cull after exact", options->repo); + } else { + /* Determine minimum score to match basenames */ + double factor = 0.5; + char *basename_factor = getenv("GIT_BASENAME_FACTOR"); + int min_basename_score; + + if (basename_factor) + factor = strtol(basename_factor, NULL, 10)/100.0; + assert(factor >= 0.0 && factor <= 1.0); + min_basename_score = minimum_score + + (int)(factor * (MAX_SCORE - minimum_score)); + + /* + * Cull sources: + * - remove ones involved in renames (found via exact match) + */ + trace2_region_enter("diff", "cull after exact", options->repo); + remove_unneeded_paths_from_src(want_copies); + trace2_region_leave("diff", "cull after exact", options->repo); + + /* Utilize file basenames to quickly find renames. */ + trace2_region_enter("diff", "basename matches", options->repo); + rename_count += find_basename_matches(options, + min_basename_score, + rename_src_nr); + trace2_region_leave("diff", "basename matches", options->repo); + + /* + * Cull sources, again: + * - remove ones involved in renames (found via basenames) + */ + trace2_region_enter("diff", "cull basename", options->repo); + remove_unneeded_paths_from_src(want_copies); + trace2_region_leave("diff", "cull basename", options->repo); + } + /* - * Calculate how many renames are left + * Calculate how many rename destinations are left */ num_destinations = (rename_dst_nr - rename_count); - remove_unneeded_paths_from_src(want_copies); - num_sources = rename_src_nr; + num_sources = rename_src_nr; /* rename_src_nr reflects lower number */ /* All done? */ if (!num_destinations || !num_sources) @@ -764,7 +808,7 @@ void diffcore_rename(struct diff_options *options) struct diff_score *m; if (rename_dst[i].is_rename) - continue; /* dealt with exact match already. */ + continue; /* exact or basename match already handled */ m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST]; for (j = 0; j < NUM_CANDIDATE_PER_DST; j++) diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh index 797343b38106..bf62537c29a0 100755 --- a/t/t4001-diff-rename.sh +++ b/t/t4001-diff-rename.sh @@ -280,8 +280,8 @@ test_expect_success 'basename similarity vs best similarity' ' # subdir/file.txt is 89% similar to file.md, 78% similar to file.txt, # but since same basenames are checked first... cat >expected <<-\EOF && - R088 subdir/file.txt file.md - A file.txt + A file.md + R078 subdir/file.txt file.txt EOF test_cmp expected actual ' -- gitgitgadget