LAM: Problem running external program.

Thread: LAM: Problem running external program.

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LAM: Problem running external program.
India	2007-10-08 12:35:00
I am trying to run two external program sequentially. The program runs fine till the first external program call and dont execute the second one. The code is as below: #include <stdio.h> #include "mpi.h" int main(int argc,char **argv) { int *buf, i, rank, nints, len;  ; char hostname[256];  ; MPI_Init(&amp;argc,&amp;argv); &nbsp; MPI_Comm_rank(MPI_COMM_WORLD, &rank);   MPI_Barrier(MPI_COMM_WORLD); &nbsp; gethostname(hostname,255);  ; printf("Hello world!&nbsp; I am process number: %d on host %sn", rank, hostname);   MPI_Barrier(MPI_COMM_WORLD); &nbsp; execl("/bin/date", "date", NULL); &nbsp; MPI_Barrier(MPI_COMM_WORLD); &nbsp; execl("/bin/ls", "ls", NULL); &nbsp; MPI_Barrier(MPI_COMM_WORLD); &nbsp; MPI_Finalize();  ; return 0; } The output I am getting is as below: Hello world!&nbsp; I am process number: 0 on host cluster Hello world!&nbsp; I am process number: 1 on host cluster Hello world!&nbsp; I am process number: 2 on host compute-0-1.local Hello world!&nbsp; I am process number: 4 on host compute-0-2.local Hello world!&nbsp; I am process number: 3 on host compute-0-1.local Hello world!&nbsp; I am process number: 5 on host compute-0-2.local Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 I am very new to MPI programing, any suggestions would be highly appreciated. Thanking you in advance. Regards &#32; Did you know? You can CHAT without downloading messenger. Click here
Re: LAM: Problem running external program.
	2007-10-08 12:44:42
Hi, Use "system" instead of "execl".&nbsp; For more information try "man execl" and "man system".&nbsp; Basically, the first call to execl causes your program to be replaced by /bin/date.    HTH,   mac mccalla From: lam-bounceslam-mpi.org [mailto:lam-bounceslam-mpi.org] On Behalf Of E Cell Sent: Monday, October 08, 2007 12:35 PM To: lamlam-mpi.org Subject: LAM: Problem running external program. I am trying to run two external program sequentially. The program runs fine till the first external program call and dont execute the second one. The code is as below: #include <stdio.h> #include "mpi.h" int main(int argc,char **argv) { int *buf, i, rank, nints, len; &nbsp; char hostname[256];  ; MPI_Init(&argc,&argv);   MPI_Comm_rank(MPI_COMM_WORLD, &rank);   MPI_Barrier(MPI_COMM_WORLD); &nbsp; gethostname(hostname,255); &nbsp; printf("Hello world!&nbsp; I am process number: %d on host %sn", rank, hostname);   MPI_Barrier(MPI_COMM_WORLD); &nbsp; execl("/bin/date", "date", NULL); &nbsp; MPI_Barrier(MPI_COMM_WORLD); &nbsp; execl("/bin/ls", "ls", NULL); &nbsp; MPI_Barrier(MPI_COMM_WORLD); &nbsp; MPI_Finalize(); &nbsp; return 0; } The output I am getting is as below: Hello world!&nbsp; I am process number: 0 on host cluster Hello world!&nbsp; I am process number: 1 on host cluster Hello world!&nbsp; I am process number: 2 on host compute-0-1.local Hello world!&nbsp; I am process number: 4 on host compute-0-2.local Hello world!&nbsp; I am process number: 3 on host compute-0-1.local Hello world!&nbsp; I am process number: 5 on host compute-0-2.local Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 Thu Oct 11 12:18:40 IST 2007 I am very new to MPI programing, any suggestions would be highly appreciated. Thanking you in advance. Regards Did you know? You can CHAT without downloading messenger. Click here