petsc-3.14.5 2021-03-03
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# PetscLogDefaultBegin

Turns on logging of objects and events. This logs flop rates and object creation and should not slow programs down too much. This routine may be called more than once.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode  PetscLogDefaultBegin(void)

Logically Collective over PETSC_COMM_WORLD

### Options Database Keys

| -log_view [viewertype:filename:viewerformat] | - Prints summary of flop and timing information to the screen (for code configured with --with-log=1 (which is the default))

### Usage

          PetscInitialize(...);
          PetscLogDefaultBegin();
           ... code ...
          PetscLogView(viewer); or PetscLogDump();
          PetscFinalize();

### Notes

PetscLogView(viewer) or PetscLogDump() actually cause the printing of the logging information.

### See Also

PetscLogDump(), PetscLogAllBegin(), PetscLogView(), PetscLogTraceBegin()

### Level

advanced

### Location

src/sys/logging/plog.c

### Examples

src/ksp/ksp/tutorials/ex79.c.html
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Index of all manual pages