Actual source code: ex3.c


  2: static char help[] = "Augmenting PETSc profiling by add events.\n\
  3: Run this program with one of the\n\
  4: following options to generate logging information:  -log, -log_view,\n\
  5: -log_all.  The PETSc routines automatically log event times and flops,\n\
  6: so this monitoring is intended solely for users to employ in application\n\
  7: codes.\n\n";

  9: /*T
 10:    Concepts: PetscLog^user-defined event profiling
 11:    Concepts: profiling^user-defined event
 12:    Concepts: PetscLog^activating/deactivating events for profiling
 13:    Concepts: profiling^activating/deactivating events
 14:    Processors: n
 15: T*/

 17: /*
 18:   Include "petscsys.h" so that we can use PETSc profiling routines.
 19: */
 20: #include <petscsys.h>
 21: #include <petscviewer.h>

 23: int main(int argc,char **argv)
 24: {
 25:   PetscMPIInt    rank;
 26:   int            i,imax=10000,icount;
 27:   PetscLogEvent  USER_EVENT,check_USER_EVENT;

 29:   PetscInitialize(&argc,&argv,NULL,help);

 31:   /*
 32:      Create a new user-defined event.
 33:       - Note that PetscLogEventRegister() returns to the user a unique
 34:         integer event number, which should then be used for profiling
 35:         the event via PetscLogEventBegin() and PetscLogEventEnd().
 36:       - The user can also optionally log floating point operations
 37:         with the routine PetscLogFlops().
 38:   */
 39:   PetscLogEventRegister("User event",PETSC_VIEWER_CLASSID,&USER_EVENT);
 40:   PetscLogEventGetId("User event",&check_USER_EVENT);

 43:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 44:   icount = 0;
 45:   for (i=0; i<imax; i++) icount++;
 46:   PetscLogFlops(imax);
 47:   PetscSleep(0.5);
 48:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 50:   /*
 51:      We disable the logging of an event.

 53:   */
 54:   PetscLogEventDeactivate(USER_EVENT);
 55:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 56:   PetscSleep(0.5);
 57:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 59:   /*
 60:      We next enable the logging of an event
 61:   */
 62:   PetscLogEventActivate(USER_EVENT);
 63:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 64:   PetscSleep(0.5);
 65:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 67:   /*
 68:      We test event logging imbalance
 69:   */
 70:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 71:   if (rank == 0) PetscSleep(0.5);
 72:   PetscLogEventSync(USER_EVENT,PETSC_COMM_WORLD);
 73:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 74:   MPI_Barrier(PETSC_COMM_WORLD);
 75:   PetscSleep(0.5);
 76:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 78:   PetscFinalize();
 79:   return 0;
 80: }

 82: /*TEST

 84:    build:
 85:      requires: defined(PETSC_USE_LOG)

 87:    test:

 89: TEST*/