问题
after installing the newest Ubuntu 12.04 on my machine all the rspec tests for all my rails applications are running very very slow. Also a colleague of mine has the same problem.
Anyone an idea what it could be? Its really annoying...
回答1:
My specs were taking 4x longer than my coworkers who are running Vagrant on Mac OSX. I found this post which seems to solve the problem. Apparently anyone using ext4 will experience this unless they follow the instructions on the blog post:
Open up your /etc/fstab file in an editor of your liking (as sudo).
Look for the line that describes the partition you are running Ubuntu on. For example:
UUID=f54ae48f-7525-4b18-92bf-dbe5b1fb9be6 / ext4 errors=remount-ro 0 1
Add a barrier=0 option so it now looks like this:
UUID=f54ae48f-7525-4b18-92bf-dbe5b1fb9be6 / ext4 barrier=0,errors=remount-ro 0 1
来源：https://stackoverflow.com/questions/10583669/rspec-incredibly-slow-after-installing-ubuntu-12-04