Printing the DSGraph in llvm-3.0


I am using the DSA analysis in llvm-3.0. I am interested in seeing the resultant DSGraph for my sample input program. I tried the -dsa-only-print parameter, but was not successful in getting the .dot file for the graph as mentioned in Printer.cpp. The exact command that I tried is:

#opt -load <> -dsa-local -dsa-bu -dsa-td -dsa-only-print < hello.bc

Is there anything else I need to do to get the graph ? Thanks a lot for your help !