On 06/03/2016 10:06, Marco Lubosch wrote:
Hello guys,
I try to do the first steps with Open MPI and I finally got it work on
Cygwin64(Windows 7 64bit).
I am able to compile plain C code without any issues via "mpicc ..." but
when I try to initialize MPI the program is getting stuck within
"MPI_INIT" without creating CPU load. Example from
https://svn.open-mpi.org/source/xref/ompi_1.8/examples/:
#include <stdio.h>
#include "mpi.h"
int main(int argc, char* argv[])
{
int rank, size, len;
char version[MPI_MAX_LIBRARY_VERSION_STRING];
printf("1\n");
MPI_Init(&argc, &argv);
printf("2\n");
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
printf("3\n");
MPI_Comm_size(MPI_COMM_WORLD, &size);
printf("4\n");
MPI_Get_library_version(version, &len);
printf("5\n");
printf("Hello, world, I am %d of %d, (%s, %d)\n", rank, size,
version, len);
MPI_Finalize();
printf("6\n");
return 0;
}
Compiling works perfectly fine with "mpicc -o hello_c.exe hello_c.c".
But when I run it with "mpirun -np 4 ./hello_c" it creates 4 threads
printing "1" but then keeps on running without doing anything. I then
have to kill the threads manually to keep on working with Cygwin.
Can you tell me what I am doing wrong?
Thanks
Marco
PS: Installed packages on Cygwin are libopenmpi, libopenmpi-devel,
openmpi, gcc-core
It seems a local issue. On my W7 64 bit:
$ mpirun -n 4 ./prova_mpi.exe
1
1
1
1
2
3
4
5
Hello, world, I am 0 of 4, (Open MPI v1.8.8, .., Aug 05, 2015, 126)
2
3
4
5
Hello, world, I am 2 of 4, (Open MPI v1.8.8, package: ..., Aug 05, 2015,
126)
2
3
4
5
Hello, world, I am 1 of 4, (Open MPI v1.8.8, ... , Aug 05, 2015, 126)
2
3
4
5
Hello, world, I am 3 of 4, (Open MPI v1.8.8, ... , Aug 05, 2015, 126)
6
6
6
6
