First do not compile any of the UPC source files in your application with a compile-time specified value. Then, at runtime, provide the -fupc-threads-n option on the command line, just after the executable program's file name. The UPC runtime strips off all of the initial command line arguments that begin with the prefix -fupc-, and passes the remaining arguments to your application's main program. The following example, shows how this is done:

% cat dynamic.upc
#include 
#include 
int
main ()
{
  if (MYTHREAD == 0)
    
    printf ("There are %d UPC threads.\n", THREADS);
}
% upc dynamic.upc -o dynamic
% dynamic -fupc-threads-7
There are 7 UPC threads.
	
	

	
						
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