On May 21, 2010, at 3:13 AM, Olivier Riff wrote:"It depends". :-)
> -> That is what I was thinking about to implement. As you mentioned, and specifically for my case where I mainly send short messages, there might not be much win. By the way, are their some benchmarks testing sequential MPI_ISend versus MPI_BCAST for instance ? The aim is to determine up which buffer size a MPI_BCast is worth to be used for my case. You can answer that the test is easy to do and that I can test it by myself :)
You're probably best writing a benchmark yourself that mirrors what your application is going to do.