Re: [OMPI users] Maximum message size for MPI_Send()/MPI_Recv() functions

2007-08-03 Thread Juan Carlos Guzman
ot ... the problem come from Open MPI I guess. Yes I can fill the buffer entirely with dummy value to ensure that the memory allocated is actually used, so I don't think the problem is in the OS. Cheers, Juan-Carlos. Thanks, george. On Aug 2, 2007, at 6:59 PM, Juan Carl

Re: [OMPI users] Maximum message size for MPI_Send()/MPI_Recv() functions

2007-08-02 Thread Juan Carlos Guzman
should be covered. However, there are some known problems with the MPI interface for data larger than sizeof(int). As an example the _count field in the MPI_Status structure will be truncated ... Thanks, george. On Jul 30, 2007, at 1:47 AM, Juan Carlos Guzman wrote: Hi, Does anyon

[OMPI users] Maximum message size for MPI_Send()/MPI_Recv() functions

2007-07-30 Thread Juan Carlos Guzman
Hi, Does anyone know the maximum buffer size I can use in MPI_Send() (MPI_Recv) function?. I was doing some testing using two nodes on my cluster to measure the point-to-point MPI message rate depending on size. The test program exchanges MPI_FLOAT datatypes between two nodes. I was able