id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
10696	MongoDB idling at 15-20% CPU usage	lazymanc		"I'm experiencing an issue where mongodb consumes 15-20% CPU constantly when idle. This is especially inconvenient when trying to develop on a laptop as it drains the battery a lot more quickly than necessary.

Details:
 * Host: Mac OS X 10.7.4 (mid 2011 macbook air 13"")
 * Guest: Ubuntu 12.04 server (64-bit) configured with 512mb ram / 8gb sata disk.
 * Mongodb installed via 10gen repo as described here: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-ubuntu-linux/
 * mongodb monitored using top command

The mongod process idles at 15-20% cpu usage on the ubuntu guest, even when no connections are active. I have converted the same VM image and run it under Parallels and the issue goes away (mongodb idling at 0-1% cpu). Others have mongodb running under vmware and xen and cannot reproduce the issue, so it appears to be specific to virtualbox.

"	defect	closed	other	VirtualBox 4.1.18	invalid	mongodb, cpu, idle		Linux	Mac OS X