Dear All:

How to find the buffer size of OpenMPI ? 

I need to transfer large data between nodes on a cluster with OpenMPI 1.3.4.

Many nodes need to send data to the same node . 

Workers use mpi_isend, the receiver node use  mpi_irecv. 

because they are non-blocking, the messages are stored in buffers of senders. 

And then, the receiver collect messages from its buffer. 

If the receiver's buffer is too small, there will be truncate error. 

Any help is appreciated. 


July 9  2010

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