mt302_TTaskGroupNested.C

Go to the documentation of this file.

/// \file
/// \ingroup tutorial_multicore
/// \notebook
/// Calculate Fibonacci numbers exploiting nested parallelism through TTaskGroup.
///
/// \macro_code
///
/// \date August 2017
/// \author Danilo Piparo

int Fibonacci(int n)
{
   if (n < 2) {
      return n;
   } else {
      int x, y;
      ROOT::Experimental::TTaskGroup tg;
      tg.Run([&] { x = Fibonacci(n - 1); });
      tg.Run([&] { y = Fibonacci(n - 2); });
      tg.Wait();
      return x + y;
   }
}

void mt302_TTaskGroupNested()
{

   ROOT::EnableImplicitMT(4);

   cout << "Fibonacci(33) = " << Fibonacci(33) << endl;
}