[petsc-users] PETSc initialization error

[Sam Guo]

Assuming finalizer is only needed once for entire session(?), I can put
initializer into the static block to call it once but where do I call
finalizer?


On Saturday, June 20, 2020, Junchao Zhang <junchao.zhang at gmail.com> wrote:

> The counter num_attr should be recycled. But first try to call PETSc
> initialize/Finalize only once to see it fixes the error.
> --Junchao Zhang
>
>
> On Sat, Jun 20, 2020 at 12:48 AM Sam Guo <sam.guo at cd-adapco.com> wrote:
>
>> To clarify, I call PETSc initialize and PETSc finalize everytime I call
>> SLEPc:
>>
>>   PetscInitializeNoPointers(argc,args,nullptr,nullptr);
>>
>>   SlepcInitialize(&argc,&args,static_cast<char*>(nullptr),help);
>>
>>   //calling slepc
>>
>>   SlepcFinalize();
>>
>>    PetscFinalize();
>>
>>
>>
>> On Fri, Jun 19, 2020 at 10:32 PM Sam Guo <sam.guo at cd-adapco.com> wrote:
>>
>>> Dear PETSc team,
>>>    When I called SLEPc multiple time, I eventually got following error:
>>>
>>> MPI operation not supported by PETSc's sequential MPI wrappers
>>> [0]PETSC ERROR: #1 PetscInitialize() line 967 in ../../../petsc/src/sys/
>>> objects/pinit.c
>>> [0]PETSC ERROR: #2 SlepcInitialize() line 262 in ../../../slepc/src/sys/
>>> slepcinit.c
>>> [0]PETSC ERROR: #3 SlepcInitializeNoPointers() line 359 in
>>> ../../../slepc/src/sys/slepcinit.c
>>> PETSC ERROR: Logging has not been enabled.
>>> You might have forgotten to call PetscInitialize().
>>>
>>>   I debugged: it is because of following in petsc/src/sys/mpiuni/mpi.c
>>>
>>> if (num_attr >= MAX_ATTR)
>>>
>>> in function int MPI_Comm_create_keyval(MPI_Copy_function
>>> *copy_fn,MPI_Delete_function *delete_fn,int *keyval,void *extra_state)
>>>
>>> num_attr is declared static and keeps increasing every
>>> time MPI_Comm_create_keyval is called.
>>>
>>> I am using petsc 3.11.3 but found 3.13.2 has the same logic.
>>>
>>> Is this a bug or I didn't use it correctly?
>>>
>>> Thanks,
>>> Sam
>>>
>>
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