Question

Can “#pragma omp parallel for” be used inside a loop in the following form:

For (i=0;i<...;.i+=1) 
  { #pragma omp parallel for
      for(j=0;j<...;j+=1) 
       { Some code.....} 

• Will this just parralelize the loop on ‘j’ ?

Thanks on advence !

Answer 1

Yes, it can be used like that. But compiler directives have to be on a line of their own

for( ... )
{
    #pragma omp parallel for
    for( ...
//..

Also, this will indeed only execute the inner loop in parallel. If you need both loops to execute in parallel you need a second #pragma omp parallel for above the outer loop.