Printouts of less than 100 bytes would be unusual...but possible On Wed, Sep 22, 2010 at 8:15 AM, Jeff Squyres <jsquy...@cisco.com> wrote:
> Are you running on machines with OpenFabrics devices (that Open MPI is > using)? > > Is ompi-ps printing 100 bytes or more? > > What does ps show when your program is hung? > > > > On Sep 17, 2010, at 3:13 PM, Matheus Bersot Siqueira Barros wrote: > > > Open MPI Version = 1.4.2 > > OS = Ubuntu 10.04 LTS and CentOS 5.3 > > > > When I run the mpi program below in the terminal, the function fgets > hangs. > > How do I know it? I do a printf before and later the call of fgets and > only the message "before fgets()" is showed. > > > > However, when I run the same program at Eclipse 3.6 with CDT > 7.0.0.201006141710 or using gdb it runs normally. > > If you change the command in the function popen to another one(for > instance: "ls -l"), it will run correctly. > > > > I use the following commands to compile and run the program: > > > > compile : mpicc teste.c -o teste.run > > > > run : mpirun -np 4 ./teste.run > > > > > > Does anyone know why the program behaves like that? > > > > Thanks in advance, > > > > Matheus Bersot. > > > > MPI_PROGRAM: > > > > #include <stdio.h> > > #include "mpi.h" > > > > int main(int argc, char *argv[]) > > { > > int rank, nprocs; > > FILE * pFile = NULL; > > char mystring [100]; > > > > MPI_Init(&argc,&argv); > > MPI_Comm_size(MPI_COMM_WORLD,&nprocs); > > MPI_Comm_rank(MPI_COMM_WORLD,&rank); > > > > if(rank == 0) > > { > > pFile = popen ("ompi-ps" , "r"); > > if (pFile == NULL) perror ("Error opening file"); > > else { > > while(!feof(pFile)) > > { > > printf("before fgets()\n"); > > fgets (mystring , 100 , pFile); > > printf("after fgets()\n"); > > puts (mystring); > > } > > pclose (pFile); > > } > > } > > > > MPI_Finalize(); > > return 0; > > } > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >