MPI_COMM_WORLD P0 P1 P2 Pn P2 t0 t1 MPI Processes Threads t2 t3 Global Endpoint Rank EP_Comm comm[0] 7 8 9 10 Local Endpoint Rank 0 1 2 3 comm[1] comm[2] comm[3] true true 50 1.0 cm false 10 0 true true true 2.0.8 1867 1176 53 24 0.8435993572576326 true true true 138