On Thu, Sep 23, 2010 at 12:21 PM, Matheus Bersot Siqueira Barros
<matheusbersotsb@gmail.com> wrote:
Jeff and Ralph,
Thank you for your reply.
1) I'm not running on machines with OpenFabrics.
2) In my example, ompi-ps prints a maximum 82 bytes per line. Even so, I augment to 300 bytes per line to be sure that it is not the problem.
char mystring [300];
...
fgets (mystring , 300 , pFile);
2) When I run ps, it shows just two process: ps and bash.
PID TTY TIME CMD
1961 pts/5 00:00:00 bash
2154 pts/5 00:00:00 ps
But when I run ps -a -l, it appears my program(test.run) and other processes. I put below just the information related to my program.
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
0 S 1000 1841 1840 0 80 0 - 18054 pipe_w pts/0 00:00:00 test.run
0 S 1000 1842 1840 0 80 0 - 18053 poll_s pts/0 00:00:00 test.run
0 S 1000 1843 1840 0 80 0 - 18053 poll_s pts/0 00:00:00 test.run
0 S 1000 1844 1840 0 80 0 - 18053 poll_s pts/0 00:00:00 test.run
pipe_s = wait state on read/write against a pipe.
So, with that command I concluded that one mpi process is waiting for the read of a pipe.
The problem still persists.
Thanks,
Matheus.
On Wed, Sep 22, 2010 at 11:24 AM, Ralph Castain
<rhc@open-mpi.org> wrote:
Printouts of less than 100 bytes would be unusual...but possibleOn Wed, Sep 22, 2010 at 8:15 AM, Jeff Squyres
<jsquyres@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
> users@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
jsquyres@cisco.com
For corporate legal information go to:
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