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RCKMPI and RCCE support a similar style of programming. It really depends on what you want to do with the SCC. If you have some applications that you want to run on the SCC in addition to other platforms, it might be a good idea to go with MPI. If you want to dive deeper and take a closer look, perhaps at the primitives that make up the communication and synchronization between cores, or if you want to experiment with programming models other than message passing, I would suggest to start with RCCE. I haven't used RCKMPI myself, but I think RCCE is definitely a good place to start and learn about the SCC.
You can certainly try if you like, but whether you use can Visual Studio to build SCC programs is more a question for Microsoft than us. You'd have to configure Visual Studio to use the cross compilers and not the default compiler. And if you are running on a PC with Windows, you'd have to ensure that these cross compilers work on Windows. I don't know of anyone who has done that. Users typically use make on Ubuntu Linux. If you want to use a GUI to build, you might consider configuring Eclipse on Ubuntu Linux to build SCC programs.
Two quick questions
1- Does RCKMPI has an emulator like RCCE?
2- I have a big program that uses OpenMPI and I want to see the performance of my program on SCC. Can I compile OpenMPI' source on scc and then use it in my program or it's easier to convert OpenMPI functions I have in my program to their equivalent RCKMPI functions?