Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753844AbcKYMzt (ORCPT ); Fri, 25 Nov 2016 07:55:49 -0500 Received: from mail-pg0-f68.google.com ([74.125.83.68]:33619 "EHLO mail-pg0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751764AbcKYMz3 (ORCPT ); Fri, 25 Nov 2016 07:55:29 -0500 Date: Fri, 25 Nov 2016 18:22:46 +0530 From: Afzal Mohammed To: "Michael Kerrisk (man-pages)" Cc: Mike Galbraith , Peter Zijlstra , Ingo Molnar , linux-man , lkml , Thomas Gleixner Subject: Re: RFC: documentation of the autogroup feature [v2] Message-ID: <20161125125246.GA7600@afzalpc> References: <41d802dc-873a-ff02-17ff-93ce50f3e925@gmail.com> <1479901185.4306.38.camel@gmx.de> <327586fa-4672-d070-0ded-850654586273@gmail.com> <1479915229.4306.106.camel@gmx.de> <7513b0a5-c5d0-3a92-5849-995af22601e4@gmail.com> <1479921075.4306.153.camel@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 942 Lines: 21 Hi, On Thu, Nov 24, 2016 at 10:41:29PM +0100, Michael Kerrisk (man-pages) wrote: > Suppose that there are two autogroups competing for the same > CPU. The first group contains ten CPU-bound processes from a > kernel build started with make -j10. The other contains a sin‐ > gle CPU-bound process: a video player. The effect of auto‐ > grouping is that the two groups will each receive half of the > CPU cycles. That is, the video player will receive 50% of the > CPU cycles, rather just 9% of the cycles, which would likely ^^^^ than ? Regards afzal > lead to degraded video playback. Or to put things another way: > an autogroup that contains a large number of CPU-bound pro‐ > cesses does not end up overwhelming the CPU at the expense of > the other jobs on the system.