How was MPICH installed? Are you including the right mpi.h header in your program? Have you tried compiling and running the cpi.c example that comes with MPICH? If you send us the smallest possible program that can reproduce this error, it would help us get to the bottom of the issue. Ken On 05/01/2014 09:49 AM, mark wrote:

Hello. I am getting an error that i wasn't getting before.

------------------------------------------------------------------------ test.c: In function 'main': test.c:63: error: 'MPI_COMM_WORLD' undeclared (first use in this function) test.c:63: error: (Each undeclared identifier is reported only once test.c:63: error: for each function it appears in.) test.c:111: error: 'MPI_INT' undeclared (first use in this function) ------------------------------------------------------------------------ line 63 : MPI_Comm_size(MPI_COMM_WORLD, &numnodes); line 111:MPI_Scatter( array, PARTS, MPI_INT, my_array, PARTS, MPI_INT, master, MPI_COMM_WORLD);

I am under a 2.6.23-gentoo-r5 cluster with gcc version 4.2.2 (Gentoo 4.2.2 p1.0)

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