1c4762a1bSJed Brown! Synchronized printing: Fortran Example 2c4762a1bSJed Brown 3c4762a1bSJed Brown 4c4762a1bSJed Brownprogram main 5c4762a1bSJed Brown#include <petsc/finclude/petscsys.h> 6c4762a1bSJed Brown use petscsys 7c4762a1bSJed Brown 8c4762a1bSJed Brown implicit none 9c4762a1bSJed Brown PetscErrorCode :: ierr 10c4762a1bSJed Brown PetscMPIInt :: myRank,mySize 11*62ac926dSPierre Jolivet character(len=PETSC_MAX_PATH_LEN) :: outputString 12c4762a1bSJed Brown 13c4762a1bSJed Brown ! Every PETSc program should begin with the PetscInitialize() routine. 14c4762a1bSJed Brown 15c4762a1bSJed Brown call PetscInitialize(PETSC_NULL_CHARACTER,ierr) 16c4762a1bSJed Brown if (ierr /= 0) then 17c4762a1bSJed Brown write(6,*) 'Unable to initialize PETSc' 18c4762a1bSJed Brown stop 19c4762a1bSJed Brown endif 20c4762a1bSJed Brown 21c4762a1bSJed Brown ! The following MPI calls return the number of processes 22c4762a1bSJed Brown ! being used and the rank of this process in the group 23c4762a1bSJed Brown 24c4762a1bSJed Brown call MPI_Comm_size(MPI_COMM_WORLD,mySize,ierr) 25c4762a1bSJed Brown CHKERRA(ierr) 26c4762a1bSJed Brown call MPI_Comm_rank(MPI_COMM_WORLD,myRank,ierr) 27c4762a1bSJed Brown CHKERRA(ierr) 28c4762a1bSJed Brown 29c4762a1bSJed Brown ! Here we would like to print only one message that represents 30c4762a1bSJed Brown ! all the processes in the group 31c4762a1bSJed Brown write(outputString,*) 'No of Processors = ', mysize, ', rank = ',myRank,'\n' 32c4762a1bSJed Brown call PetscPrintf(PETSC_COMM_WORLD,outputString,ierr) 33c4762a1bSJed Brown CHKERRA(ierr) 34c4762a1bSJed Brown 35c4762a1bSJed Brown write(outputString,*) myRank,'Synchronized Hello World\n' 36c4762a1bSJed Brown call PetscSynchronizedPrintf(PETSC_COMM_WORLD,outputString,ierr) 37c4762a1bSJed Brown CHKERRA(ierr) 38c4762a1bSJed Brown write(outputString,*) myRank,'Synchronized Hello World - Part II\n' 39c4762a1bSJed Brown call PetscSynchronizedPrintf(PETSC_COMM_WORLD,outputString,ierr) 40c4762a1bSJed Brown CHKERRA(ierr) 41c4762a1bSJed Brown call PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT,ierr) 42c4762a1bSJed Brown CHKERRA(ierr) 43c4762a1bSJed Brown 44c4762a1bSJed Brown ! Here a barrier is used to separate the two program states. 45c4762a1bSJed Brown call MPI_Barrier(PETSC_COMM_WORLD,ierr) 46c4762a1bSJed Brown CHKERRA(ierr) 47c4762a1bSJed Brown 48c4762a1bSJed Brown write(outputString,*) myRank,'Jumbled Hello World\n' 49c4762a1bSJed Brown call PetscPrintf(PETSC_COMM_SELF,outputString,ierr) 50c4762a1bSJed Brown CHKERRA(ierr) 51c4762a1bSJed Brown 52c4762a1bSJed Brown call PetscFinalize(ierr) 53c4762a1bSJed Brown CHKERRA(ierr) 54c4762a1bSJed Brown 55c4762a1bSJed Brownend program main 56c4762a1bSJed Brown 57c4762a1bSJed Brown!/*TEST 58c4762a1bSJed Brown! 59c4762a1bSJed Brown! test: 60c4762a1bSJed Brown! 61c4762a1bSJed Brown!TEST*/ 62