petsc-master 2014-09-17
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PetscLogEventBarrierBegin

Logs the time in a barrier before an event.

Synopsis

#include 
PetscErrorCode PetscLogEventBarrierBegin(int e,PetscObject o1,PetscObject o2,PetscObject o3,PetscObject o4,MPI_Comm comm)
Not Collective

Input Parameters

e -integer associated with the event obtained from PetscLogEventRegister()
o1,o2,o3,o4 -objects associated with the event, or 0
comm -communicator the barrier takes place over

Usage

     PetscLogEventBarrierBegin(VEC_NormBarrier,0,0,0,0,comm);
       MPI_Allreduce()
     PetscLogEventBarrierEnd(VEC_NormBarrier,0,0,0,0,comm);

Notes

This is for logging the amount of time spent in a barrier for an event that requires synchronization.

Additional Notes

Synchronization events always come in pairs; for example, VEC_NormBarrier and VEC_NormComm = VEC_NormBarrier + 1

See Also

PetscLogEventRegister(), PetscLogEventEnd(), PetscLogFlops(), PetscLogEventBegin(),
PetscLogEventBarrierEnd()

Keywords

log, event, begin, barrier

Level:advanced
Location:
src/sys/logging/plog.c
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