Number of Processes General Question

[Cassanova, Bill]

Hi folks,

Just wondering why would vsipl++ report a different number of processors
than sysconf?

The Program: 

int main(int argc, char **argv)
{
   vsipl init(argc, argv);

   std::cout << "num_processors as reported by vsipl++: " <<
num_processors() << std::endl;

   std::cout << "num_processors as reported by sysconf(
_SC_NPROCESSORS_CONF ): " 
             << sysconf(_SC_NPROCESSORS_CONF) << std::endl;


   return(0);
}

The Result:
num_processors as reported by vsipl++: 1
num_processors as reported by sysconf( _SC_NPROCESSORS_CONF ): 8


Do I need to necessarily run a vsipl++ program using mpirun, i.e:

"mpirun -np${num_processors} ./vsipl_tester" 

In order for vsipl++ to recognize that there are multiple processors
installed on the machine?

Thanks,
Bill

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