Comparison of web framework

http://vschart.com/compare/spring-framework/vs/play-framework/vs/grails/vs/ruby-on-rails

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KVM on Slackware

http://www.grocock.me.uk/installing-qemu-kvm-and-virt-manager-on-slackware/

If you are using virtualbox, probably you get the following error:

failed to initialize KVM: Device or resource busy
No accelerator found!

Just turn off virtualbox and the error should disappear.