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c++ Programming Glossary: mpi_info_nullCreating a counter that stays synchronized across MPI processes http://stackoverflow.com/questions/4948788/creating-a-counter-that-stays-synchronized-across-mpi-processes if count rank hostrank MPI_Alloc_mem count size sizeof int MPI_INFO_NULL count data for int i 0 i count size i count data i 0 MPI_Win_create.. count data count size sizeof int sizeof int MPI_INFO_NULL MPI_COMM_WORLD count win else count data NULL MPI_Win_create.. win else count data NULL MPI_Win_create count data 0 1 MPI_INFO_NULL MPI_COMM_WORLD count win count myval 0 return count int increment_counter..
writing a matrix into a single txt file with mpi http://stackoverflow.com/questions/9777828/writing-a-matrix-into-a-single-txt-file-with-mpi all data.txt MPI_MODE_CREATE MPI_MODE_WRONLY MPI_INFO_NULL file MPI_File_set_view file 0 MPI_CHAR localarray native MPI_INFO_NULL.. file MPI_File_set_view file 0 MPI_CHAR localarray native MPI_INFO_NULL MPI_File_write_all file data_as_txt locnrows ncols num_as_string..
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