From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 593541387B1 for ; Sat, 18 Oct 2014 23:02:35 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 6B87CE0AAE; Sat, 18 Oct 2014 23:02:27 +0000 (UTC) Received: from uberouter3.guranga.net (unknown [81.19.48.176]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 34AEDE0965 for ; Sat, 18 Oct 2014 23:02:25 +0000 (UTC) Received: from [192.168.1.115] (unknown [91.235.98.134]) (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by uberouter3.guranga.net (Postfix) with ESMTPSA id D9914415 for ; Sun, 19 Oct 2014 00:02:15 +0100 (BST) Message-ID: <5442F17C.7040904@thegeezer.net> Date: Sun, 19 Oct 2014 00:02:20 +0100 From: thegeezer User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.8.0 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: gigabyte mobo latency References: <5442DAC8.2030106@thegeezer.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Archives-Salt: 3cb8c316-eeec-4d70-8e5d-c9524740233d X-Archives-Hash: 32a7e59af3260f1180acb260ed63e8bc On 18/10/14 22:51, James wrote: > thegeezer thegeezer.net> writes: > > >>> So. Is there a make.conf setting or elsewhere to make the >>> terminal session response times, in the browsers (seamonkey, firefox) >>> faster? >>> the typing latency in the browser windows)..... >>> ideas? >> two things you might like to look into: 1. cgroups (including freezer) >> to help isolate your browsers and also 2. look at atop instead of htop >> as this includes disk io > > 2. The system rarely uses 8 G of the 32 G available, so disk IO is > not the problem. No heavy writes. It was the java scripts.... > > 1. Ahhhhhhhhhhhhhhhhhhh! tell me more. I found these links quickly: > > https://www.kernel.org/doc/Documentation/cgroups/freezer-subsystem.txt > > http://wiki.gentoo.org/wiki/LXC#Freezer_Support > > I'm not sure if you've read any of my clustering_frustration posts > over the last month or so, but cgroups is at the heart of clustering now. > It seems many of the systemd based cluster solutions are having all > sorts of OOM, OOM-killer etc etc issues. So any and all good information, > examples and docs related to cgroups is of keen interests to me. My efforts > to build up a mesos/spark cluster, center around openrc and therefore > direct management of resources via cgroups. > > The freezer is exactly what I'm looking for. Maybe I also need to read up > on lxc? What are the best ways to dynamically manage via cgroups? A gui? > A static config file? a CLI tool? > > > curiously, > James > > > > > the thing with cgroups is that you can choose to create a hierarchy of what _you_ want to have as your priority unfortunately you need to tell the machine what it is you want, it can't really guess granularly iuc e.g. your favourite terminal / ide etc you want high prio and your favourite file mangler to be low prio ( assuming you want compiling to take precedence over bit munging to usb etc) there is however cgroup support in htop, and i thought that you could adjust cgroup in stead of nice but a quick google is showing that i dreamed it as a nice feature; that would be super slick as you can easily adjust all parts of program demand -- io / memory / cpu using openRC you can start services i.e. apache to have a certain priority, and ssh to have another http://wiki.gentoo.org/wiki/OpenRC/CGroups http://qnikst.github.io/posts/2013-02-20-openrc-cgroup.html the reason i suggest freezer is that you can more easily "pause" or CTRL-Z something that would otherwise be in a GUI and maybe not respond to SIGSTP on my laptop :- # mount | grep freez freezer on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) # cd /sys/fs/cgroup/freezer/ call the folder something meaningful # mkdir investigate # cd investigate you can use the following, i just did echo $$ for local bash pid... make sure to get all threads especially something like chrome spawns many children # ps -eLf | grep mybadapp note the single > actually concatenates # echo $PID > tasks to remove you actually have to "move" the process into a different cgroup i.e. # echo $PID > /sys/fs/cgroup/freezer/tasks ok so once you have all your tasks in there just make sure you are in /sys/fs/cgroup/freezer/investigate # echo FROZEN > freezer.state to thaw # echo THAWED > freezer.state there is a little more here http://gentoo-en.vfose.ru/wiki/Improve_responsiveness_with_cgroups which will allow you to script creating a cgroup with the processID of an interactive shell, that you can start from to help save hunting down all the threads spawned by chrome. you can then do fun stuff with echo $$ > /sys/fs/cgroup/cpu/high_priority/tasks but for your original point of maybe it's not an issue with something like IO it could still be a very high number disk reads -- low actual thoughput but the demand on the io system was high, i.e. 6zillion reads hopefully this will give you a bit more control over all of that though