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POHigh idle CPU usage for MongoDB on Ubuntu guest VM
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  1. POHigh idle CPU usage for MongoDB on Ubuntu guest VM
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    copied!<p>I'm running an Ubuntu 12.04 server instance on VirtualBox on a OS X 10.7 host (MacBook Air 13"). The instance is configured with 512mb ram. The disk image is set to 8GB (dynamically allocated if that makes any difference) and is using 2.6GB.</p> <p>I've just installed MongoDB from the 10gen repo as described here: <a href="http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-ubuntu-linux/" rel="nofollow">http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-ubuntu-linux/</a></p> <p>I haven't changed any of the default settings as yet.</p> <p>The mongod process is now running at 15-20% cpu constantly, before I've connected anything to it. I wouldn't normally have checked but it's now causing the fans to stay on whenever the VM is running.</p> <p>Restarting mongodb makes no difference. Restarting the VM makes no difference.</p> <p>The log is as follows:</p> <pre><code>Thu Jun 21 16:52:14 [initandlisten] MongoDB starting : pid=1737 port=27017 dbpath=/var/lib/mongodb 64-bit host=devbox Thu Jun 21 16:52:14 [initandlisten] db version v2.0.6, pdfile version 4.5 Thu Jun 21 16:52:14 [initandlisten] git version: e1c0cbc25863f6356aa4e31375add7bb49fb05bc Thu Jun 21 16:52:14 [initandlisten] build info: Linux ip-10-110-9-236 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_41 Thu Jun 21 16:52:14 [initandlisten] options: { config: "/etc/mongodb.conf", dbpath: "/var/lib/mongodb", logappend: "true", logpath: "/var/log/mongodb/mongodb.log" } Thu Jun 21 16:52:14 [initandlisten] journal dir=/var/lib/mongodb/journal Thu Jun 21 16:52:14 [initandlisten] recover : no journal files present, no recovery needed Thu Jun 21 16:52:14 [initandlisten] waiting for connections on port 27017 Thu Jun 21 16:52:14 [websvr] admin web console waiting for connections on port 28017 </code></pre> <p>I'm assuming 15-20% cpu usage at idle isn't normal, so I'd like to know if anyone has any suggestions on what to try to fix it?</p> <p><em>edit</em> I've now converted the disk image to a fixed size VDI and it's made no difference, still at 15-20% CPU usage on the guest.</p>
 

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