petsc-3.4.5 2014-06-29

EventRegLogRegister

Registers an event for logging operations in an application code.

Synopsis

#include "petscsys.h"   
PetscErrorCode EventRegLogRegister(PetscEventRegLog eventLog, const char ename[], PetscClassId classid, PetscLogEvent *event)

Not Collective

Input Parameters

	eventLog	- The EventLog
	ename	- The name associated with the event
	classid	- The classid associated to the class for this event

Output Parameter

event -The event

Example of Usage

      int USER_EVENT;
      PetscLogDouble user_event_flops;
      PetscLogEventRegister("User event name",0,&USER_EVENT);
      PetscLogEventBegin(USER_EVENT,0,0,0,0);
         [code segment to monitor]
         PetscLogFlops(user_event_flops);
      PetscLogEventEnd(USER_EVENT,0,0,0,0);

Notes

PETSc automatically logs library events if the code has been compiled with -DPETSC_USE_LOG (which is the default) and -log, -log_summary, or -log_all are specified. PetscLogEventRegister() is intended for logging user events to supplement this PETSc information.

PETSc can gather data for use with the utilities Jumpshot (part of the MPICH distribution). If PETSc has been compiled with flag -DPETSC_HAVE_MPE (MPE is an additional utility within MPICH), the user can employ another command line option, -log_mpe, to create a logfile, "mpe.log", which can be visualized Jumpshot.

Keywords

log, event, register