I apologize to post so many questions, but I got a new question here: my program runs everything well on 1 machine right now. when I run it on two machines, the program got error:

Fatal error in PMPI_Scatter: Message truncated,

MPIDI_CH3U_Receive_data_found(131) Message from rank 0 and tag 5 truncated. 1774000 bytes received but buffer size is 52.

MPIC_Send(59).......: Negative count, value is -32

I cannot understand how does this happened. the hello world is tested for network link. and the program is fine running on one computer.

Thank you very much for any suggestions

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Best Regards,