Hello everybody, I have just installed openmpi v. 1.2.5 under ubuntu 8.04 and I have compiled the following "hello world" program:
------start code------ #include <stdio.h> #include <mpi.h> int main(int argc, char *argv[]){ int rank, size, len; char hostname[256] = ""; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_Comm_size(MPI_COMM_WORLD, &size); MPI_Get_processor_name(hostname, &len); printf("Hello World! I am %d of %d running on %s\n", rank, size, hostname); MPI_Finalize(); return 0; } ------end code------ which I think is pretty basic stuff. Anyway, when I run it (single node, three cores), I get the following output: mpiexec.openmpi -np 6 hello Hello World! I am 0 of 1 running on el-torito Hello World! I am 0 of 1 running on el-torito Hello World! I am 0 of 1 running on el-torito Hello World! I am 0 of 1 running on el-torito Hello World! I am 0 of 1 running on el-torito Hello World! I am 0 of 1 running on el-torito where "el-torito" is the hostname. Shouldn't it be something like?: Hello World! I am 0 of 6 running on el-torito Hello World! I am 1 of 6 running on el-torito Hello World! I am 2 of 6 running on el-torito ... etc. Any ideas as to why I keep getting wrong numbers for rank and number of processes? Greetings from Monterrey, Mexico -- Victor M. Rosas GarcĂa