# PetscLogSet
Sets the logging functions called at the beginning and ending of every event. 
## Synopsis
```
#include "petscsys.h"   
PetscErrorCode PetscLogSet(PetscErrorCode (*b)(PetscLogEvent, int, PetscObject, PetscObject, PetscObject, PetscObject), PetscErrorCode (*e)(PetscLogEvent, int, PetscObject, PetscObject, PetscObject, PetscObject))
```
Not Collective


## Input Parameters

- ***b -*** The function called at beginning of event
- ***e -*** The function called at end of event





## Developer Note
The default loggers are `PetscLogEventBeginDefault()` and `PetscLogEventEndDefault()`.


## See Also
 [](ch_profiling), `PetscLogDump()`, `PetscLogDefaultBegin()`, `PetscLogAllBegin()`, `PetscLogTraceBegin()`, `PetscLogEventBeginDefault()`, `PetscLogEventEndDefault()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/logging/plog.c.html#PetscLogSet">src/sys/logging/plog.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/logging/plog.c)


[Index of all Profiling routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
