The two-volume set LNCS 6852/6853 constitutes the refereed proceedings of the 17th International Euro-Par Conference held in Bordeaux, France, in August/September 2011.The 81 revised full papers presented were carefully reviewed and selected from 271 submissions. The papers are organized in topical sections on support tools and environments, performance prediction and evaluation, scheduling and load-balancing, high-performance architectures and compilers, parallel and distributed data management, grid, cluster and cloud computing, peer to peer computing, distributed systems and algorithms, parallel and distributed programming, parallel numerical algorithms, multicore and manycore programming, theory and algorithms for parallel computation, high performance networks and mobile ubiquitous computing.