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=-4.2 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 1DA8620248 for ; Fri, 1 Mar 2019 09:31:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731686AbfCAJbP (ORCPT ); Fri, 1 Mar 2019 04:31:15 -0500 Received: from mail-it1-f169.google.com ([209.85.166.169]:37336 "EHLO mail-it1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727697AbfCAJbO (ORCPT ); Fri, 1 Mar 2019 04:31:14 -0500 Received: by mail-it1-f169.google.com with SMTP id z124so20382801itc.2 for ; Fri, 01 Mar 2019 01:31:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=hkedx81GsBhaGV9jkJ3cjjPn9FRbaWAQbum25ZB8K78=; b=cU37yFBMRE4hM/oygtySy30XAk/Onh8u+ZeVFAPZ+G0TERc5ioTSF41HNfzlnY4HB1 qtqW4AUNEGRtwMmNRuaOCKht7CCsNveGG+oEuiQRwr0fupdUDXIZEoaGw5jWrO207ZQI 2BvejhRC2CalfueR2ChkR929QJNns2l2n+sHli9rXqGAbwlKAV8Nq/+zOedJLziliGN0 QEppgbIJGu/GGYIXd2GuKeF+MQdmUi6jjEvy65FXmLRNv5kF8NMVjAGgX1jEL6KHpXW2 ORmc7Gv4mQRCUa1R5PK2T5sSGDr5oPZpbtz9uizEPIgH8kEWP1R5/124PU9GE7kgfzvw X3mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=hkedx81GsBhaGV9jkJ3cjjPn9FRbaWAQbum25ZB8K78=; b=XSsG4id7hLCvo1W2PPVTTG6w6WRX5N6p+LZu227DlgX9cXN3Eyp02VpaXN/3G1WkmI 8sMOcgZCQlKORwY3c0onYYEItrt5zC4ryv0o7OkQsFq7+d8FqGkRJGqyHbPyKYw3iG2R xTuIX/pJn9Btn3QkPVpsQ4/Px2ugEnw5t/ULbYvYMvh1nYYf1haJDdsv30puUni9AWAS HUBpZ+yDwOFZfxfb/rkWqbo3RD93x+IkU4aEVZ7ZbFtIPQ5uzDhW8tkAP+cQ/xlpDUtA rAUe19b/zljEwcnoHcwPBOeoZpyTtuqQq5a+RoFCdSi/Cdc0pk3iGgR3tBmFRici+mXM 3eGw== X-Gm-Message-State: AHQUAuaerRe2/rqlnl9tpUdtxK4uo+rx2sm0cKXgRwhBWYOtykAYTBy1 p3GpeT9S7hTHd6u4VH/cLa9UQv/RgPqaccf3sww= X-Google-Smtp-Source: APXvYqxlzX0nRTN+Y/ykpzLnaCiS2e5memSaQJobaV5OIzgKE5TGPHIO9JXTiZvMZt/s/1uUrP8ZGSZMO1AjGBiEqns= X-Received: by 2002:a24:7542:: with SMTP id y63mr2596744itc.70.1551432673500; Fri, 01 Mar 2019 01:31:13 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Duy Nguyen Date: Fri, 1 Mar 2019 16:30:47 +0700 Message-ID: Subject: Re: Questions on GSoC 2019 Ideas To: Christian Couder Cc: Matheus Tavares Bernardino , git , Thomas Gummerer , =?UTF-8?B?0J7Qu9GPINCi0LXQu9C10LbQvdCw0Y8=?= , Elijah Newren , Tanushree Tumane 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 Fri, Mar 1, 2019 at 5:20 AM Christian Couder wrote: > > Hi Matheus, > > On Thu, Feb 28, 2019 at 10:46 PM Matheus Tavares Bernardino > wrote: > > > > I've been in the mailing list for a couple weeks now, mainly working > > on my gsoc micro-project[1] and in other patches that derived from it. > > I also have been contributing to the Linux Kernel for half an year, > > but am now mainly just supporting other students here at USP. > > > > I have read the ideas page for the GSoC 2019 and many of them interest > > me. Also, looking around git-dev materials on the web, I got to the > > GSoC 2012 ideas page. And this one got my attention: > > https://github.com/peff/git/wiki/SoC-2012-Ideas#improving-parallelism-in-various-commands > > > > I'm interested in parallel computing and that has been my research > > topic for about an year now. So I would like to ask what's the status > > of this GSoC idea. I've read git-grep and saw that it is already > > parallel, but I was wondering if there is any other section in git in > > which it was already considered to bring parallelism, seeking to > > achieve greater performance. And also, if this could, perhaps, be a > > GSoC project. > > I vaguely remember that we thought at one point that all the low > hanging fruits had already been taken in this area but I might be > wrong. We still have to remove some global variables, which is quite easy to do, before one could actually add mutexes and stuff to allow multiple pack access. I don't know though if the removing global variables is that exciting for GSoC, or if both tasks could fit in one GSoC. The adding parallel access is not that hard, I think, once you know packfile.c and sha1-file.c relatively well. It's mostly dealing with caches and all the sliding access windows safely. -- Duy