Juan,
I have to check to see what's wrong there. We build Open MPI with
full support for data transfer up to sizeof(size_t) bytes. so you
case 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 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 to send up to 4 GB of data (500 Mega MPI_FLOATs)
before the process crashed with a segmentation fault message.
Is the maximum size of the message limited by the sizeof(int) * sizeof
(MPI data type) used in the MPI_Send()/MPI_Recv() functions?
My cluster has openmpi 1.2.3 installed. Each node has 2 x dual core
AMD Opteron and 12 GB RAM.
Thanks in advance.
Juan-Carlos.
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