:orphan:
# PetscViewerVUFlushDeferred
Flushes the deferred write cache to the file. 
## Synopsis
```
#include "petscsys.h"   
PetscErrorCode PetscViewerVUFlushDeferred(PetscViewer viewer)
```
Not Collective


## Input Parameter

- ***viewer -*** The `PETSCVIEWERVU` `PetscViewer`





## See Also
 [](sec_viewers), `PETSCVIEWERVU`, `PetscViewerVUPrintDeferred()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/vu/petscvu.c.html#PetscViewerVUFlushDeferred">src/sys/classes/viewer/impls/vu/petscvu.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/vu/petscvu.c)


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