It seems that this is sort of a basic version of Omega (probably with Google-specific scheduling heuristics missing). I'd strongly recommend folks interested in this stuff to read the Omega paper [1] or to watch the Wilkes video [2].

[1]: http://research.google.com/pubs/pub41684.html [2]: https://www.youtube.com/watch?v=XsXlm4wmB6o