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# PetscLogNestedBegin
Turns on nested logging of objects and events. This logs flop rates and object creation and should not slow programs down too much. 
## Synopsis
```
#include "petsclog.h" 
PetscErrorCode PetscLogNestedBegin(void)
```
Logically Collective over `PETSC_COMM_WORLD`


## Options Database Keys

- ***-log_view :filename.xml:ascii_xml -*** Prints an XML summary of flop and timing information to the file



## Usage
```none
      PetscInitialize(...);
      PetscLogNestedBegin();
       ... code ...
      PetscLogView(viewer);
      PetscFinalize();
```





## See Also
 `PetscLogDump()`, `PetscLogAllBegin()`, `PetscLogView()`, `PetscLogTraceBegin()`, `PetscLogDefaultBegin()`

## Level
advanced

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex1f.F90.html">src/snes/tutorials/ex1f.F90</A><BR>


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


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