>>> Ralph Castain 11/17/09 4:04 PM >>> >Your cmd line is telling OMPI to run 17 processes. Since your hostfile indicates that only 16 of them are to >run on 10.4.23.107 (which I assume is your PS3 node?), 1 process is going to be run on 10.4.1.23 (I assume >this is node1?). node1 has 16 Cores (4 x AMD Quad Core Processors)
node2 is the ps3 with two processors (slots) >I would guess that the executable is compiled to run on the PS3 given your specified path, so I would >expect it to bomb on node1 - which is exactly what appears to be happening. the executable is compiled on each node separately and lies at each node in the same directory /mnt/projects/PS3Cluster/Benchmark/pi on each node different directories are mounted. so there exists a separate executable file compiled at each node. in the end i want to ran R on this cluster with Rmpi - as i get a similar problem there i rist wanted to try with an c programm. with r happens the same thing it works when i start it on each node but if i want to start more than 16 processes on node one in exits. On Nov 17, 2009, at 1:59 AM, Laurin Müller wrote: Hi, i want to build a cluster with openmpi. 2 nodes: node 1: 4 x Amd Quad Core, ubuntu 9.04, openmpi 1.3.2 node 2: Sony PS3, ubuntu 9.04, openmpi 1.3 both can connect with ssh to each other and to itself without passwd. I can run the sample proramm pi.c on both nodes seperatly (see below). But if i try to start it on node1 with --hostfile option to use node 2 "remote" i got this error: cluster@bioclust:~$ mpirun --hostfile /etc/openmpi/openmpi-default-hostfile -np 17 /mnt/projects/PS3Cluster/Benchmark/pi -------------------------------------------------------------------------- mpirun noticed that the job aborted, but has no info as to the process that caused that situation. -------------------------------------------------------------------------- my hostfile: cluster@bioclust:~$ cat /etc/openmpi/openmpi-default-hostfile 10.4.23.107 slots=16 10.4.1.23 slots=2 i can see with top that the processors of node2 begin to work shortly, then it apports on node1. I use this sample/test program: #include #include #include "mpi.h" int main(int argc, char *argv[]) { int i, n; double h, pi, x; int me, nprocs; double piece; /* --------------------------------------------------- */ MPI_Init (&argc, &argv); MPI_Comm_size (MPI_COMM_WORLD, &nprocs); MPI_Comm_rank (MPI_COMM_WORLD, &me); /* --------------------------------------------------- */ if (me == 0) { printf("%s", "Input number of intervals:\n"); scanf ("%d", &n); } /* --------------------------------------------------- */ MPI_Bcast (&n, 1, MPI_INT, 0, MPI_COMM_WORLD); /* --------------------------------------------------- */ h = 1. / (double) n; piece = 0.; for (i=me+1; i <= n; i+=nprocs) { x = (i-1)*h; piece = piece + ( 4/(1+(x)*(x)) + 4/(1+(x+h)*(x+h))) / 2 * h; } printf("%d: pi = %25.15f\n", me, piece); /* --------------------------------------------------- */ MPI_Reduce (&piece, *, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD); /* --------------------------------------------------- */ if (me == 0) { printf("pi = %25.15f\n", pi); } /* --------------------------------------------------- */ MPI_Finalize(); return 0; } it works on each node. node1: cluster@bioclust:~$ mpirun -np 4 /mnt/projects/PS3Cluster/Benchmark/piInput number of intervals: 20 0: pi = 0.822248040052981 2: pi = 0.773339953424083 3: pi = 0.747089984650041 1: pi = 0.798498008827023 pi = 3.141175986954128 node2: cluster@kasimir:~$ mpirun -np 2 /mnt/projects/PS3Cluster/Benchmark/pi Input number of intervals: 5 1: pi = 1.267463056905495 0: pi = 1.867463056905495 pi = 3.13 4926113810990 cluster@kasimir:~$ Thx in advance, Laurin _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users