In this case, you will need to define your own MPI_Op -- the pre-defined MPI_Op's only work with a limited set of pre-defined MPI_Datatypes. See the table in MPI-2.2 on pages 165 and 166. On Jun 27, 2012, at 9:09 PM, Dharmendar Reddy wrote:

Hello, Can some one help me with user defined MPI reduce operation in FORTRAN. I have defined a MPI_TYPE_CONTIGUOUS and am able to send and receive it. When i try to to MPI_Reduce, i get error. I have attached the code.

Thanks reddy

-- ----------------------------------------------------- Dharmendar Reddy Palle Graduate Student Microelectronics Research center, University of Texas at Austin, 10100 Burnet Road, Bldg. 160 MER 2.608F, TX 78758-4445 e-mail: [email protected] Phone: +1-512-350-9082 United States of America.

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