# PetscLogEventSetCollective
Indicates that a particular event is collective. 
## Synopsis
```
#include "petscsys.h"   
PetscErrorCode PetscLogEventSetCollective(PetscLogEvent event, PetscBool collective)
```
Not Collective


## Input Parameters

- ***event -*** The event id
- ***collective -*** Boolean flag indicating whether a particular event is collective





## Notes
New events returned from `PetscLogEventRegister()` are collective by default.

Collective events are handled specially if the -log_sync is used. In that case the logging saves information about
two parts of the event; the time for all the MPI ranks to synchronize and then the time for the actual computation/communication
to be performed. This option is useful to debug imbalance within the computations or communications


## See Also
 [](ch_profiling), `PetscLogEventBegin()`, `PetscLogEventEnd()`, `PetscLogEventRegister()`

## Level
developer

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


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