setstream(1);
loop(10); H2D;  NullKernel; streamsync; endloop(1);
loop(10); H2D; NullKernel; streamsync; endloop(1);
loop(100); H2D; NullKernel; streamsync; endloop(1);
loop(100); H2D;  NullKernel; streamsync; endloop(1);
loop(1000); H2D; NullKernel; streamsync; endloop(1);
loop(1000); H2D; NullKernel; streamsync; endloop(1);
loop(10000); H2D; NullKernel; streamsync; endloop(1);
loop(10000); H2D; NullKernel; streamsync; endloop(1);