title: segmentation fault using OMP
body: <p>all! Typing from Italy
  This little piece of code works if the matrix size is less then 800 and fails with a segmentation fault for higher sizes....
  I have tried it with gcc 4.3.2 compiler in linux and macosx and VisualStudio compiler in windows.
  Seemsthe problem is in the stack size..... how can I increase it ?
  How can I solve the problem for bigger matrix sizes ?
  The code works fine in serial put fails in parallel execution.
   Thanks.</p>
  
  <pre><code>#include &lt;omp.h&gt;
  #include &lt;stdio.h&gt;
  #define Nu 4000
  int main() {
  float A[Nu][Nu],B[Nu][Nu],C[Nu][Nu];
  int i,j;
  #pragma omp parallel
  printf("Hello from thread %d, nthreads %d\n", omp_get_thread_num(), omp_get_num_threads());
  #pragma omp parallel for private(j,i) shared(A,B,C) schedule(static)
  for(j=0;j&lt;Nu;j++){
  for(i=0;i&lt;Nu;i++){
  //printf("Hello from thread %d, i,j %d %d\n", omp_get_thread_num(),i,j );
  A[i][j]=0;
  B[i][j]=0;
  C[i][j]=0;
  
  }}
  
  }
  </code></pre>