From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-3.7 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 4386A1F45F for ; Mon, 6 May 2019 13:47:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726095AbfEFNr6 (ORCPT ); Mon, 6 May 2019 09:47:58 -0400 Received: from mail-qt1-f194.google.com ([209.85.160.194]:41244 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725852AbfEFNr5 (ORCPT ); Mon, 6 May 2019 09:47:57 -0400 Received: by mail-qt1-f194.google.com with SMTP id c13so14701704qtn.8 for ; Mon, 06 May 2019 06:47:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=tM9a3dcXaOxXjo6xeTNWwTQBBIOgfCye3xndLvm6GaU=; b=F/GsUT5sV8V8IVJxJ9q2OTw9eGOaJylsqcP5NOPWuKlPLNEC9250r8RkBq80qIl95P d849fKwRBi5Ejzt7Ob885wDtgrJRUH0Urjf1fqqnI9xuEzLKOqs4K7/gQrEt2bmU1hMM rQ2NKtYoYyrF0oFca6C/TuFK97+6Zli2cryIZnbhVSQrCgdD0/F3GzRwfl7vGEjDH0Ux O2i9g4bX0r09NGDXs/4G57uYGindvpN0so6aERr6lhcfd1bS9VwQqDP+bGBBECMuoYPV N6NZqdCLqe2d/t5RWUjHE3MJm9BgwAQ36W1VjKKHpZceg9EB5Z5mSs4neTFZP+GyJcCO /Z/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=tM9a3dcXaOxXjo6xeTNWwTQBBIOgfCye3xndLvm6GaU=; b=Wkg4lA7HQwvj8kPDRUErF6BybkErSlw6qxzC9mIOPXORI2Ozt79W20LbmdZDlcNYxr YW7mZbyb50JoGA04OWcxAezlUJVaWWojZVdi+348oviHDOok5+ICPbaOk9pEg6f5Kr4Z FUgr7rZqPFeX2UIPwX2Lo7ZIhcMkyjSrMtIyGMBSBzPf3d6mwpTcSWp17eG//j6RvEou oK4U39VQS9VMjCuOozsCfwGQlNWy043tDBSit1DUYwWA5c+G+tuSffjwUPCxB+OCOnp/ pq5rmOE67zWZJPG1qBlefXkCezdWll+ecz7PsZHQaKBHBc7KDmAC3jc1A4u4toSoTp4h ykVA== X-Gm-Message-State: APjAAAXXxbzmhLd30Bv0IQ41mhjJS5BefCWlCe/mztfrmTzUSVgb5A9Y 4FNHwlTLX0JWoHtv4daAjEM= X-Google-Smtp-Source: APXvYqxHg3k3WWt8q7pez/rWOWiRQSoct/jps13CLJTi2BB3ZDojFzPCSwaQmn914HlOM487/GAClQ== X-Received: by 2002:ac8:2392:: with SMTP id q18mr21001859qtq.299.1557150476597; Mon, 06 May 2019 06:47:56 -0700 (PDT) Received: from ?IPv6:2001:4898:6808:13e:ca3:f1b0:e81c:4f11? ([2001:4898:8010:0:f5d8:f1b0:e81c:4f11]) by smtp.gmail.com with ESMTPSA id z11sm780244qki.95.2019.05.06.06.47.55 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Mon, 06 May 2019 06:47:55 -0700 (PDT) Subject: Re: [PATCH v3 0/6] Create commit-graph file format v2 To: Christian Couder , =?UTF-8?B?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= Cc: Derrick Stolee via GitGitGadget , git , "brian m. carlson" , Junio C Hamano , Jeff King References: <87lfzprkfc.fsf@evledraar.gmail.com> <87h8acivkh.fsf@evledraar.gmail.com> <04ac97c5-ab2b-2b23-4c84-8ed8aab0e2f5@gmail.com> <87bm0jirjj.fsf@evledraar.gmail.com> From: Derrick Stolee Message-ID: Date: Mon, 6 May 2019 09:47:55 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:67.0) Gecko/20100101 Thunderbird/67.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org On 5/6/2019 4:27 AM, Christian Couder wrote: > On Fri, May 3, 2019 at 3:44 PM Ævar Arnfjörð Bjarmason wrote: >> 1) We can stat() the "commit-graphs" directory to see if there's any >> new/deleted ones (dir mtime changed), similar to what we do for the >> untracked cache, and can (but I don't think we do...) do for packs/* >> and objects/??/. >> >> As opposed to ".git/objects/info" itself which e.g. has the "packs", >> "alternates" etc. files (can still do it, but more false positives) > > About incremental commit-graph files and alternates, I wonder if they > could work well together. The main use case would be for servers that > use a common repo for all the forks. We use a "shared object cache" in VFS for Git, implemented as an alternate, so all enlistments share prefetch packs, multi-pack-indexes, and commit-graph files. This is something we are very focused on. Thanks, -Stolee