From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-3.0 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,RCVD_IN_SORBS_SPAM, RP_MATCHES_RCVD shortcircuit=no autolearn=no autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 2309720958 for ; Mon, 20 Mar 2017 18:24:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932131AbdCTSYk (ORCPT ); Mon, 20 Mar 2017 14:24:40 -0400 Received: from mail-it0-f50.google.com ([209.85.214.50]:35098 "EHLO mail-it0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756001AbdCTSYe (ORCPT ); Mon, 20 Mar 2017 14:24:34 -0400 Received: by mail-it0-f50.google.com with SMTP id y18so45189124itc.0 for ; Mon, 20 Mar 2017 11:24:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=qnQWE+0Q3jfSUGTGUlfujXgLSR+95EX6a8KsBRgRHjw=; b=NObLjnfAuRPml5uLPtIo6eGZiGEdkEb2O3J8nx4l808hl08AGIoro8byL3ElXhxvUG NbffDBXai8QJ9vfn49B83ovOQmuNnw0iezLFgKp2pzlAVTDRfGof64g0hT6sCLPovRQ8 zfBvcuapqvdQfd76ZX6mdbco6iXXT/HhG5KcZq0rD8hbJ13qQh1AbMXrZUauFyUed6+g C+93o2T6is4NCvgg36yiqB52s+2fqmnfxeXSQMzRUOfrEhWxqCX6nJM1MFLKu1AJHKXQ 9nqK581j1FztqaZhZFNTw2BZ7s96TS3VjHvUlcBHx56UdG/JolqvkqALOM085AcCqmdi 2Nvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=qnQWE+0Q3jfSUGTGUlfujXgLSR+95EX6a8KsBRgRHjw=; b=tJ+pYCvI+XHlF168Qm8O5eqWobY+ERGlgQMU+Pa7oh+jZNq7Jr7+r74YV/kuJl4Re9 FVyx0Q/oJAvIM4IklKoyHGQkEvC9uHjlD2MZENYkKzIVYKMHmbudg2HysTR7tNACjguH JQTgmLPGaU5bEFz9B/2/WDhOBtQdk13SJ2OTIQXUDSpG7MlRfTNmsetUVmrHu5VFIMph Lez3KfggaqovCuVFgJoQy+5H7FxWf66z/AfRieWR19p7rF01wRKag4beTEflg5o9MH4w Yy9RekRWH3VoFUwJFXJukAW8Gg5CPx969aX/SwuGsx7zK7iaLhNpowfCNi6LqWWtsIeN n4WA== X-Gm-Message-State: AFeK/H2x2ynL8nau7CZQddmkNzukCpYobdCd8VmHaGSxDstzDF/6dl3P1uLik07y0uflT9Sq6czLXCBjNXCWNg== X-Received: by 10.107.200.139 with SMTP id y133mr2365020iof.147.1490034272706; Mon, 20 Mar 2017 11:24:32 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.130.208 with HTTP; Mon, 20 Mar 2017 11:24:12 -0700 (PDT) In-Reply-To: References: From: =?UTF-8?B?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= Date: Mon, 20 Mar 2017 19:24:12 +0100 Message-ID: Subject: Re: [PATCH 00/20] Separate `ref_cache` into a separate module To: Michael Haggerty Cc: Junio C Hamano , =?UTF-8?B?Tmd1eeG7hW4gVGjDoWkgTmfhu41jIER1eQ==?= , David Turner , Jeff King , Git Mailing List Content-Type: text/plain; charset=UTF-8 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org On Mon, Mar 20, 2017 at 5:33 PM, Michael Haggerty wrote: > I've completed a draft of an epic 48-patch series implementing all of > the above points on my GitHub fork [1] as branch > `wip/mmap-packed-refs`. It dramatically speeds up performance and > reduces memory usage for some tasks in repositories with very many > packed references. Just curious, what sort of performance numbers on mainly what sort of operations? I'd expect the fixed cost of e.g. `git log -1 >/dev/null` to go down, which can take as long as a second on some repos with a huge amount of refs, but anything else?