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>

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

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

 35:   /* 
 36:      Create a new user-defined event.
 37:       - Note that PetscLogEventRegister() returns to the user a unique
 38:         integer event number, which should then be used for profiling
 39:         the event via PetscLogEventBegin() and PetscLogEventEnd().
 40:       - The user can also optionally log floating point operations
 41:         with the routine PetscLogFlops().
 42:   */
 43:   PetscLogEventRegister("User event",PETSC_VIEWER_CLASSID,&USER_EVENT);
 44:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 45:   icount = 0;
 46:   for (i=0; i<imax; i++) icount++;
 47:   PetscLogFlops(imax);
 48:   PetscSleep(1);
 49:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

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

 54:   */
 55:   PetscLogEventDeactivate(USER_EVENT);
 56:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 57:   PetscSleep(1);
 58:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 60:   /* 
 61:      We next enable the logging of an event
 62:   */
 63:   PetscLogEventActivate(USER_EVENT);
 64:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 65:   PetscSleep(1);
 66:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 68:   PetscFinalize();
 69:   return 0;
 70: }
 71: