[petsc-users] Vec is locked read only

[Dave May]

On 2 April 2016 at 11:18, Rongliang Chen <rl.chen at siat.ac.cn> wrote:

> Hi Shri,
>
> Thanks for your reply.
>
> Do you mean that I need to change the VecGetArrary() in
> /home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c to VecGetArrayRead()?
>

No - you should change it in your function FormMassTimeStepFunction().
The input vector x passed into SNESComputeFunction() is read only.



> I tried it and I got a warning when I make the petsc:
>
> /home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c: In function
> ‘DMLocalToGlobalBegin’:
> /home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c:1913:5: warning:
> passing argument 2 of ‘VecGetArrayRead’ from incompatible pointer type
> [enabled by default]
> In file included from /home/rlchen/soft/petsc-3.6.3/include/petscmat.h:6:0,
> from /home/rlchen/soft/petsc-3.6.3/include/petscdm.h:6,
> from /home/rlchen/soft/petsc-3.6.3/include/petsc/private/dmimpl.h:6,
> from /home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c:1:
> /home/rlchen/soft/petsc-3.6.3/include/petscvec.h:420:29: note: expected
> ‘const PetscScalar **’ but argument is of type ‘PetscScalar **’
>
> Best regards,
> Rongliang
>
> ---------------------
> Rongliang Chen,   PhD
> Associate Professor
>
> Laboratory for Engineering and Scientific Computing
> Shenzhen Institutes of Advanced Technology
> Chinese Academy of Sciences
> Address: 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen,
> Guangdong (518055), P. R. China
> E-mail:  rl.chen at siat.ac.cn
> Phone: +86-755-86392312
>
>
> On 04/02/2016 05:03 PM, Abhyankar, Shrirang G. wrote:
>
>> Use VecGetArrayRead instead of VecGetArray
>>
>>
>> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecGetArray
>> Read.html
>>
>>
>> Shri
>>
>> -----Original Message-----
>> From: Rongliang Chen <rl.chen at siat.ac.cn>
>> Date: Saturday, April 2, 2016 at 3:51 AM
>> To: PETSc users list <petsc-users at mcs.anl.gov>, "rongliang.chan at gmail.com
>> "
>> <rongliang.chan at gmail.com>
>> Subject: [petsc-users] Vec is locked read only
>>
>> Dear All,
>>>
>>> My code got the following error messages, but the code works well for
>>> the petsc optimized version (--with-debugging=0). Anyone can tell me how
>>> to fix this problem?
>>>
>>> Best regards,
>>> Rongliang
>>>
>>>
>>> [0]PETSC ERROR: --------------------- Error Message
>>> --------------------------------------------------------------
>>> [0]PETSC ERROR: Object is in wrong state
>>> [0]PETSC ERROR:  Vec is locked read only, argument # 1
>>> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
>>> for trouble shooting.
>>> [0]PETSC ERROR: Petsc Release Version 3.6.3, Dec, 03, 2015
>>> [0]PETSC ERROR: ./Nwtun on a 64bit-debug named rlchen by rlchen Sat Apr
>>> 2 15:40:32 2016
>>> [0]PETSC ERROR: Configure options --download-blacs --download-scalapack
>>> --download-metis --download-parmetis --download-exodusii
>>> --download-netcdf --download-hdf5
>>> --with-mpi-dir=/home/rlchen/soft/Program/mpich2-shared
>>> --with-debugging=1 --download-fblaslapack --download-chaco
>>> [0]PETSC ERROR: #1 VecGetArray() line 1646 in
>>> /home/rlchen/soft/petsc-3.6.3/src/vec/vec/interface/rvector.c
>>> [0]PETSC ERROR: #2 DMLocalToGlobalBegin() line 1913 in
>>> /home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c
>>> [0]PETSC ERROR: #3 FormMassTimeStepFunction() line 191 in
>>>
>>> /home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/SetupF
>>> unctions.c
>>> [0]PETSC ERROR: #4 FormFunction() line 46 in
>>>
>>> /home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/SetupF
>>> unctions.c
>>> [0]PETSC ERROR: #5 SNESComputeFunction() line 2067 in
>>> /home/rlchen/soft/petsc-3.6.3/src/snes/interface/snes.c
>>> [0]PETSC ERROR: #6 SNESSolve_NEWTONLS() line 184 in
>>> /home/rlchen/soft/petsc-3.6.3/src/snes/impls/ls/ls.c
>>> [0]PETSC ERROR: #7 SNESSolve() line 3906 in
>>> /home/rlchen/soft/petsc-3.6.3/src/snes/interface/snes.c
>>> [0]PETSC ERROR: #8 SolveTimeDependent() line 843 in
>>>
>>> /home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/Nwtun.
>>> c
>>> [0]PETSC ERROR: #9 main() line 452 in
>>>
>>> /home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/Nwtun.
>>> c
>>>
>>>
>>>
>>
>
>
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