From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff King Subject: Re: [PATCH] travis-ci: run previously failed tests first, then slowest to fastest Date: Tue, 19 Jan 2016 20:53:10 -0500 Message-ID: <20160120015310.GB24541@sigill.intra.peff.net> References: <1453195469-51696-1-git-send-email-larsxschneider@gmail.com> <20160119191234.GA17562@sigill.intra.peff.net> <20160120002606.GA9359@glandium.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Junio C Hamano , larsxschneider@gmail.com, git@vger.kernel.org To: Mike Hommey X-From: git-owner@vger.kernel.org Wed Jan 20 02:53:23 2016 Return-path: Envelope-to: gcvg-git-2@plane.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aLhxa-0004tK-IW for gcvg-git-2@plane.gmane.org; Wed, 20 Jan 2016 02:53:22 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934313AbcATBxT (ORCPT ); Tue, 19 Jan 2016 20:53:19 -0500 Received: from cloud.peff.net ([50.56.180.127]:56642 "HELO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S932981AbcATBxM (ORCPT ); Tue, 19 Jan 2016 20:53:12 -0500 Received: (qmail 28264 invoked by uid 102); 20 Jan 2016 01:53:12 -0000 Received: from Unknown (HELO peff.net) (10.0.1.1) by cloud.peff.net (qpsmtpd/0.84) with SMTP; Tue, 19 Jan 2016 20:53:12 -0500 Received: (qmail 28878 invoked by uid 107); 20 Jan 2016 01:53:33 -0000 Received: from sigill.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.7) by peff.net (qpsmtpd/0.84) with SMTP; Tue, 19 Jan 2016 20:53:33 -0500 Received: by sigill.intra.peff.net (sSMTP sendmail emulation); Tue, 19 Jan 2016 20:53:10 -0500 Content-Disposition: inline In-Reply-To: <20160120002606.GA9359@glandium.org> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: On Wed, Jan 20, 2016 at 09:26:06AM +0900, Mike Hommey wrote: > Having recently looked into this, the relevant travis-ci documentation > is: > https://docs.travis-ci.com/user/ci-environment/ > > which says all environments have 2 cores, so you won't get much from > anything higher than -j3. FWIW, I settled on "-j16" on my 8-core (well, hyperthreaded quad-core) machine after experimenting. That's running the tests on a RAM-disk, though. On a slower filesystem where fsync() actually does something, you're going to get a lot more I/O stalls, and want a bigger CPU to process multiplier. Here are actual numbers from my machine: -j | time (user+sys) ---+------------------ 1 | 5m18s (41s+17s) 2 | 2m24s (41s+14s) 4 | 1m15s (46s+13s) 8 | 0m56s (65s+18s) 16 | 0m53s (76s+24s) 32 | 0m57s (78s+25s) Note that the CPU-second times will go up with more threads because of the frequency scaling. So yeah, -j3 might not be that unreasonable, depending on the filesystem response times. > The https://docs.travis-ci.com/user/ci-environment/ document says the > default is "sudo: false" for repositories enabled in 2015 or later, which > I assume is the case for the git repository. "sudo: required" is the > default for repositories enabled before 2015. Thanks. The document I saw used the word "recognized", and I didn't quite know what they meant. We just enabled this a month or two ago, so we should be running on the new format. -Peff