On Oct 31, 2013, at 12:14 PM, Luiz Carlos da Costa Junior <[email protected]> wrote:

I noticed that the numbers of 261895 or 261894 unexpected messages appear every time. I am using AWS machine with 60GB of RAM memory to run my application. We could see during the execution that there was more than 30 GB available. Is this a internal limitation of MPICH implementation? Would it be possible to recompile MPICH setting a different parameter? Do you know where exactly this limitation occurs?

Unexpected messages is a bad idea in general. Even if it’s an internal parameter setting (which it isn’t), it’s not a good idea to just increase it. Can you modify your application to not have that many unexpected messages? See my note on how you can post Irecvs to avoid this. —- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji