Recently, as the topic, in the use of MPI parallel computing, solving a large sparse system of linear equations, now encountered a problem, is I the equations of coefficient matrix is by reading the dat file to the program, in using mpiexec set multiple processes to execute a program, each process reads the dat file storage matrix, I hope only in main process now read dat file, don't know how to achieve it, my code is written in FORTRAN language, beg you greatly to guide, thank you very much!!!!!