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# PetscMallocValidate
Test the memory for corruption.  This can be called at any time between `PetscInitialize()` and `PetscFinalize()` 
## Synopsis
```
#include "petscsys.h" 
PetscErrorCode PetscMallocValidate(int line, const char function[], const char file[])
```

## Input Parameters

- ***line -*** line number where call originated.
- ***function -*** name of function calling
- ***file -*** file where function is



## Return value
The number of errors detected.

Options Database Keys:.

- ***-malloc_test -*** turns this feature on when PETSc was not configured with `--with-debugging=0`
- ***-malloc_debug -*** turns this feature on anytime





## Notes
Error messages are written to `stdout`.

This is only run if `PetscMallocSetDebug()` has been called which is set by `-malloc_test` (if debugging is turned on) or `-malloc_debug` (any time)

You should generally use `CHKMEMQ` as a short cut for calling this routine.

No output is generated if there are no problems detected.


## Fortran Note
The Fortran calling sequence is simply `PetscMallocValidate(ierr)`


## Developers Note
Uses the flg `TRdebugLevel` (set as the first argument to `PetscMallocSetDebug()`) to determine if it should run


## See Also
 `CHKMEMQ`, `PetscMalloc()`, `PetscFree()`, `PetscMallocSetDebug()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/memory/mtr.c.html#PetscMallocValidate">src/sys/memory/mtr.c</A>


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


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