בס"ד becuse all the command confusion. which command should i put to run the above code? 2016-03-26 3:31 GMT+03:00 Wei-keng Liao <[email protected]>:

I notice an uninitialized MPI_Status object can make MPI_Get_count return a wrong result, when the data amount in the MPI operation is zero (although I only checked MPI-IO). Attached is a test program that uses MPI collective read where only root process has non-zero length data to read. The expected result from MPI_Get_count is 0 for all non-root process. To mimic an uninitialized MPI_Status object, I call memset to make the object non-zero.

Here is the code fragment.

if (rank == 0) len = 10; else len = 0;

MPI_File_read_all(fh, buf, len, MPI_BYTE, &status);

MPI_Get_count(&status, MPI_BYTE, &get_size);

For process rank > 0, get_size may not be 0.

Wei-keng

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