Optimal block size for KNL

benchmarks/Benchmark_ITT.cc

@@ -679,8 +679,11 @@ int main (int argc, char ** argv)
   Grid_init(&argc,&argv);
 
   CartesianCommunicator::SetCommunicatorPolicy(CartesianCommunicator::CommunicatorPolicySequential);
+#ifdef KNL
+  LebesgueOrder::Block = std::vector<int>({8,2,2,2});
+#else
   LebesgueOrder::Block = std::vector<int>({2,2,2,2});
-
+#endif
   Benchmark::Decomposition();
 
   int do_memory=1;