From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mel Gorman Subject: Re: Performance of low-cpu utilisation benchmark regressed severely since 4.6 Date: Tue, 11 Apr 2017 17:42:15 +0100 Message-ID: <20170411164214.tqcvxkqm6exd6ilw@techsingularity.net> References: <20170410084117.rjh3mtdx7hd2i5ze@techsingularity.net> <004801d2b2da$0c65d2a0$253177e0$@net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Return-path: Content-Disposition: inline In-Reply-To: <004801d2b2da$0c65d2a0$253177e0$@net> Sender: linux-kernel-owner@vger.kernel.org To: Doug Smythies Cc: 'Rafael Wysocki' , =?iso-8859-15?Q?'J=F6rg?= Otte' , 'Linux Kernel Mailing List' , 'Linux PM' , 'Srinivas Pandruvada' , "'Rafael J. Wysocki'" List-Id: linux-pm@vger.kernel.org On Tue, Apr 11, 2017 at 08:41:09AM -0700, Doug Smythies wrote: > On 2017.04.11 03:03 Mel Gorman wrote: > >On Mon, Apr 10, 2017 at 10:51:38PM +0200, Rafael J. Wysocki wrote: > >> On Mon, Apr 10, 2017 at 10:41 AM, Mel Gorman wrote: > >>> > >>> It's far more obvious when looking at the git test suite and the length > >>> of time it takes to run. This is a shellscript and git intensive workload > >>> whose CPU utilisatiion is very low but is less sensitive to multiple > >>> factors than netperf and sockperf. > >> > > I would like to repeat your tests on my test computer (i7-2600K). > I am not familiar with, and have not been able to find, > "the git test suite" shellscript. Could you point me to it? > If you want to use git source directly do a checkout from https://github.com/git/git and build it. The core "benchmark" is make test and timing it. The way I'm doing it is via mmtests so git clone https://github.com/gormanm/mmtests cd mmtests ./run-mmtests --no-monitor --config configs/config-global-dhp__workload_shellscripts test-run-1 cd work/log ../../compare-kernels.sh | less and it'll generate a similar report to what I posted in this email thread. If you do multiple tests with different kernels then change the name of "test-run-1" to preserve the old data. compare-kernel.sh will compare whatever results you have. Thanks for taking a look. -- Mel Gorman SUSE Labs