fixed a problem in helloDataManWriter_nompi (#11)

examples/hello/datamanWriter/helloDataManWriter_nompi.cpp

@@ -25,7 +25,7 @@ int main(int argc, char *argv[])
         adios::IO &dataManIO = adios.DeclareIO("WANIO");
         dataManIO.SetEngine("DataManWriter");
         dataManIO.SetParameters("peer-to-peer=yes", "real_time=yes",
-                                "compress=no", "method=cache");
+                                "compress=no", "method=dump");
 
         // Define variable and local size
         auto bpFloats =