Guillermo L. Taboada Carlos Teijeiro Juan Touriño Basilio B. Fraguela Ramon Doallo José Carlos Mouriño Damián A. Mallón Andrés Gómez Performance Evaluation of Unified Parallel C Collective Communications. 69-78 2009 HPCC http://dx.doi.org/10.1109/HPCC.2009.88 conf/hpcc/2009 db/conf/hpcc/hpcc2009.html#TaboadaTTFDMMG09