Implementation of multigrid on QPACE Matthias Bolten 1 Daniel Brinkers 2 Ulrich R¨ ude 2 Markus St¨ urmer 2 1 Bergische Universit¨ at Wuppertal 2 Friedrich-Alexander-Universit¨ at Erlangen-N¨ urnberg 2011/09/26