OpenMp example. Works using some help from other forum posts.

Question

Example of using OpenMP with linux complier eng release.
Many programs are very interested in using linux/openmp/sunstudio/opteron
and I had to try it on my home AMD Suse linux first.
It worked ok, but only up to 5 threads.
Thanks + keep up the good work on the compiler porting.
Here is the code for anyone else trying this out.
// machine info:
// OS: Suse linux 10
// Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux
// CPU: AMD Athlon XP 2400+  (x86)
// complier version downloaded from
// http://developers.sun.com/prodtech/cc/linux_index.html follow download links
// eng build 18: name   sunstudio-20060314.linux.tar.bz2
// compile
// cc -xopenmp -xO3  -o hello  hello.c
// environment variables set
// LD_ASSUME_KERNEL=2.6.3      also used 2.4.19 and that worked
// OMP_DYNAMIC=FALSE
// PATH to the sunstudio /bin intstall location
#include "omp.h"
#include "stdio.h"
int main( )      {
int i,n;
int NTHREADS = 5; // more than 5 will result in a kill
int sum[NTHREADS];
// init sum
for( i=0; i<NTHREADS; i++) sum[i] = 0;
omp_set_num_threads(NTHREADS);
printf("Entering parallel\n");
#pragma omp parallel for private(i,n) shared(sum)
for( i=0; i<10; i++){
     n = omp_get_thread_num();
     //printf("thread %d  \n", n );
     sum[n] = sum[n] + 1;
printf("OpenMP complete\n");
for( i=0; i<NTHREADS; i++){
printf("%d  \n",sum) ;

Answer 1

horsh,
Yes, I see the problem with threads > 5 ( more than 5 ).
I tried both LD_ASSUME_KERNEL =2.4.19 or 2.6.3 and get the same result.
If I don't set LD_ASSUME_KERNEL , I get a seg fault immediately.
Please let me know if there is anything else I can do.
thanks