[petsc-users] error handling

[Sam Guo]

Can I assume if there is MatCreat or VecCreate, I should clean up the
memory myself?

On Mon, Jan 20, 2020 at 10:45 AM Sam Guo <sam.guo at cd-adapco.com> wrote:

> I only include the first few lines of SLEPc example. What about following
>   ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
>   ierr = MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);CHKERRQ(ierr);
> Is there any memory  lost?
>
> On Mon, Jan 20, 2020 at 10:41 AM Dave May <dave.mayhem23 at gmail.com> wrote:
>
>>
>>
>> On Mon 20. Jan 2020 at 19:39, Sam Guo <sam.guo at cd-adapco.com> wrote:
>>
>>> I don't have a specific case yet. Currently every call of PETSc is
>>> checked. If ierr is not zero, print the error and return. For example,
>>>    Mat A; /* problem matrix */
>>>    EPS eps; /* eigenproblem solver context */
>>>    EPSType type;
>>>   PetscReal error,tol,re,im;
>>>   PetscScalar kr,ki; Vec xr,xi; 25
>>>   PetscInt n=30,i,Istart,Iend,nev,maxit,its,nconv;
>>>   PetscErrorCode ierr;
>>>   ierr = SlepcInitialize(&argc,&argv,(char*)0,help);CHKERRQ(ierr);
>>>   ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr);
>>>    ierr = PetscPrintf(PETSC_COMM_WORLD,"\n1-D Laplacian Eigenproblem,
>>> n=%D\n\n",n);CHKERRQ(ierr);
>>>
>>> I am wondering if the memory is lost by calling CHKERRQ.
>>>
>>
>> No.
>>
>>
>>
>>> On Mon, Jan 20, 2020 at 10:14 AM Dave May <dave.mayhem23 at gmail.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Mon 20. Jan 2020 at 19:11, Sam Guo <sam.guo at cd-adapco.com> wrote:
>>>>
>>>>> Dear PETSc dev team,
>>>>>    If PETSc function returns an error, what's the correct way to clean
>>>>> PETSc?
>>>>>
>>>>
>>>> The answer depends on the error message reported. Send the complete
>>>> error message and a better answer can be provided.
>>>>
>>>> Particularly how to clean up the memory?
>>>>>
>>>>
>>>> Totally depends on the objects which aren’t being freed. You need to
>>>> provide more information
>>>>
>>>> Thanks
>>>> Dave
>>>>
>>>>
>>>>> Thanks,
>>>>> Sam
>>>>>
>>>>
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