Not if you pass -host localhost:128. On 08/20/2012 09:07 AM, Rajeev Thakur wrote:

So even on a machine with 128 cores it will say 1?

On Aug 20, 2012, at 9:05 AM, Pavan Balaji wrote:

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Universe size depends on how many hosts you passed in. If you give a host file, it'll be larger.

On 08/20/2012 08:48 AM, Rajeev Thakur wrote:

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Why is universe_size 1? I printed out universe size on my laptop and on vanquish, and it is 1 in both cases.

Rajeev

Begin forwarded message:

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From: Silvan Br�ndli <[email protected]> Date: August 20, 2012 4:39:52 AM CDT To: [email protected] Subject: [mpich-discuss] Spawn MPI-Process Reply-To: [email protected]

Dear all

I try to start an application using the MPI_Comm_spawn command. However, when I execute my program I get a segmentation fault. I guess, this might be because universe_size is one. As I couldn't find helpful information on setting universe_size I hope some of you could help me.

Find the source code below or in the attached files. I compile the code using mpicxx main.cpp -o main mpicxx hi.cpp -o hi

and execute the case with

mpiexec -prepend-rank -np 1 ./main

The output is

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

[0] world_size 1 [0] universe size 1 [0] try to spawn

===================================================================================== = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = EXIT CODE: 11 = CLEANING UP REMAINING PROCESSES = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES ===================================================================================== APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault (signal 11)

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

Best regards Silvan

$$$$==main.cpp==$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

#include <sstream> #include <mpi.h>;

using std::string;

int main(int argc, char *argv[]) { int myrank; if (MPI_Init(&argc,&argv)!=MPI_SUCCESS) { printf("MPI_Init failed"); } MPI_Comm_rank(MPI_COMM_WORLD, &myrank);

int world_size, universe_size, *universe_sizep, flag; MPI_Comm_size(MPI_COMM_WORLD, &world_size); printf("world_size %d\n",world_size);

MPI_Attr_get(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, &universe_sizep, &flag);

if (!flag) { printf("This MPI does not support UNIVERSE_SIZE. How many processes total?"); scanf("%d", &universe_size); } else universe_size = *universe_sizep; printf("universe size %d\n",universe_size);

char* hiargv[1]; char* m0=" "; hiargv[0]=m0;

MPI_Comm childComm; int spawnerror; printf("try to spawn\n"); MPI_Comm_spawn("./hi",hiargv, universe_size-1, MPI_INFO_NULL, myrank, MPI_COMM_SELF, &childComm, &spawnerror); printf("after spawn\n"); MPI_Finalize(); return 0; }

$$$$==hi.cpp==$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

#include <mpi.h>; int main(int argc, char** argv) { MPI_Init(NULL, NULL);

int world_size; MPI_Comm_size(MPI_COMM_WORLD, &world_size);

int world_rank; MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

printf("Hello world from, rank %d" " out of %d processors\n", world_rank, world_size);

MPI_Finalize(); return 0; }

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ -- Dipl.-Ing. Silvan Br�ndli Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10)

Technische Universit�t Hamburg-Harburg Schwarzenbergstra�e 95c 21073 Hamburg

Tel. : +49 (0)40 42878 - 6187 Fax. : +49 (0)40 42878 - 6090 e-mail: [email protected] www : http://www.tuhh.de/skf

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-- Pavan Balaji http://www.mcs.anl.gov/~balaji

-- Pavan Balaji http://www.mcs.anl.gov/~balaji