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# PetscLogMPEBegin
Turns on MPE logging of events. This creates large log files and slows the program down. 
## Synopsis
```
#include "petscsys.h"   
PetscErrorCode PetscLogMPEBegin(void)
```
Collective over `PETSC_COMM_WORLD`


## Options Database Key

- ***-log_mpe -*** Prints extensive log information





## Note
A related routine is `PetscLogDefaultBegin()` (with the options key -log_view), which is
intended for production runs since it logs only flop rates and object
creation (and should not significantly slow the programs).


## See Also
 [](ch_profiling), `PetscLogDump()`, `PetscLogDefaultBegin()`, `PetscLogAllBegin()`, `PetscLogEventActivate()`,
`PetscLogEventDeactivate()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/logging/plog.c.html#PetscLogMPEBegin">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](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)