Hi,
I am trying to run a simple program (np=2) using LAM 7.1.1
on Linux. The parent program spawns(forks) a new process
and then performs a few malloc/putenvs. However, this
forked-process dies inexplicably in one of the calls to malloc.
I am using simple LAM setup and have tried on various linux
machines including SLES8(AMD64), RH72(IA32).
I have tried to run with LAM configured with memory manager off
(i.e. --with-memory-manager=none) and this seems to fix the problem.
However, I do want the memory-manager to be activated.
Please find simple C-program attached.
Any help much appreciated.
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----------------------------------------
Phil Mason
Software Development Engineer
Ricardo Consulting Engineers Ltd
Email - Philip.Mason_at_[hidden]
Tel: 01273 794914
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#include <stdlib.h>
#include <unistd.h>
#include <mpi.h>
void spawn( void );
void jobber( void );
main(int argc, char **argv)
{
int me;
MPI_Init(&argc,&argv); /* Initialize MPI */
MPI_Comm_rank(MPI_COMM_WORLD,&me); /* Get rank */
if ( me == 0 ) spawn(); /* Spawn command, if master */
MPI_Finalize(); /* End it */
}
void spawn( void )
{
int pid;
pid = fork();
if (pid == -1) exit(1);
if (pid == 0) { /* Forked child */
jobber(); /* Do some stuff */
/* Would perform execvp here */
exit(0);
} else { /* Parent process, sleep a while */
sleep(5);
}
}
void jobber( void )
{
/* JOB 1 */
printf("Malloc'ing...\n");
malloc( 1000 );
printf("Malloc'ed\n");
putenv("VAR1=VALUE");
/* JOB 2 */
printf("Malloc'ing...\n");
malloc( 1000 );
printf("Malloc'ed\n");
putenv("VAR2=VALUE");
/* JOB 3 */
printf("Malloc'ing...\n");
malloc( 1000 );
printf("Malloc'ed\n");
putenv("VAR3=VALUE");
printf("Job done.\n");
}
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