setstream(1);
loop(10);H2D; streamsync; NullKernel;streamsync;  D2H; streamsync;endloop(1);
loop(10); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(100); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(100); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(1000); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(1000); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(10000); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
loop(10000); H2D;  streamsync; NullKernel; streamsync; D2H;  streamsync; endloop(1);
