Open MPI is the new trend to MPI applications. It promise to deliver a high quality MPI1 and MPI2 compliant implementation substituting all other implementations to date.

Of course, this is far too much to assume for a new software even for such a big project. It not only lacks documentation and a step-by-step guide to use the system but it’s not MPI2 compliant yet and there are still many basic bugs unfixed.

But don’t think it’s bad because it’s not. The architecture was quite well planned, the code is being carefully written as far as I could see and it have many options for debug the server and running MPI programs. It also have a component system where you can add new functionalities without patching the main code, which is a great deal for programs that aim to be standard one day.

LAM is being deprecated because most of their team is working on OpenMPI which is almost what happened to Mozilla and Firefox. But they make a statement on their pages that’s not true: “Since it’s an MPI implementation, you should be able to simply recompile and re-link your applications to Open MPI — they should ‘just work.’ “.

Talking to a friend (the one who found a code that didn’t compile straight away) I found out that MPICH2 is still far better for performance and MPI2 compliance. Also, installing and running LAM here shown me that LAM is still more stable and easy to use than OpenMPI.

Let the time play it’s part and see what comes out of it…