Actual source code: ex3.c

petsc-3.7.0 2016-04-25
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  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.\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>

 25: int main(int argc,char **argv)
 26: {
 28:   int            i,imax=10000,icount;
 29: #if defined(PETSC_USE_LOG)
 30:   PetscLogEvent  USER_EVENT,check_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: #if defined(PETSC_USE_LOG)
 44:   PetscLogEventRegister("User event",PETSC_VIEWER_CLASSID,&USER_EVENT);
 45:   PetscLogEventGetId("User event",&check_USER_EVENT);
 46:   if (USER_EVENT != check_USER_EVENT) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Event Ids do not match");
 47: #endif
 48:   PetscLogEventBegin(USER_EVENT,0,0,0,0);

 50:   icount = 0;
 51:   for (i=0; i<imax; i++) icount++;
 52:   PetscLogFlops(imax);
 53:   PetscSleep(1);
 54:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

 56:   /*
 57:      We disable the logging of an event.

 59:   */
 60:   PetscLogEventDeactivate(USER_EVENT);
 61:   PetscLogEventBegin(USER_EVENT,0,0,0,0);
 62:   PetscSleep(1);
 63:   PetscLogEventEnd(USER_EVENT,0,0,0,0);

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

 73:   PetscFinalize();
 74:   return 0;
 75: }