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_summary,\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.  Note that the code must be compiled with the flag -DPETSC_USE_LOG\n\
  8: (the default) to activate logging.\n\n";

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

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

 26: int main(int argc,char **argv)
 27: {
 29:   int            i,imax=10000,icount;
 30: #if defined(PETSC_USE_LOG)
 31:   PetscLogEvent USER_EVENT;
 32: #endif

 34:   PetscInitialize(&argc,&argv,(char*)0,help);

 36:   /*
 37:      Create a new user-defined event.
 38:       - Note that PetscLogEventRegister() returns to the user a unique
 39:         integer event number, which should then be used for profiling
 40:         the event via PetscLogEventBegin() and PetscLogEventEnd().
 41:       - The user can also optionally log floating point operations
 42:         with the routine PetscLogFlops().
 43:   */
 44:   PetscLogEventRegister("User event",PETSC_VIEWER_CLASSID,&USER_EVENT);
 45:   PetscLogEventBegin(USER_EVENT,0,0,0,0);

 47:   icount = 0;
 48:   for (i=0; i<imax; i++) icount++;
 49:   PetscLogFlops(imax);
 50:   PetscSleep(1);
 51:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 53:   /*
 54:      We disable the logging of an event.

 56:   */
 57:   PetscLogEventDeactivate(USER_EVENT);
 58:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 59:   PetscSleep(1);
 60:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 62:   /*
 63:      We next enable the logging of an event
 64:   */
 65:   PetscLogEventActivate(USER_EVENT);
 66:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 67:   PetscSleep(1);
 68:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 70:   PetscFinalize();
 71:   return 0;
 72: }