This book constitutes the thoroughly refereed joint post-workshop proceedings of three international events: the International Workshop on Highly Parallel Processing on a Chip, HPPC 2007, the UNICORE Summit 2007, and the Workshop on Virtualization/Xen in High-Performance Cluster and Grid Computing, VHPC 2007, held in Rennes, France, in August 2007 within the scope of Euro-Par 2007, the 13th International Conference on Parallel Computing. The 8 papers of the HHPC 2007 workshop address all aspects of existing and emerging/envisaged multi-core processors with a significant amount of parallelism,...