<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Sat, Apr 2, 2016 at 6:49 AM, Rongliang Chen <span dir="ltr"><<a href="mailto:rl.chen@siat.ac.cn" target="_blank">rl.chen@siat.ac.cn</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hi Dave,<br>
<br>
I did not call any VecGetArrary and VecGetArraryRead in function
FormMassTimeStepFunction().<br></div></div></blockquote><div><br></div><div>It looks like you have a function FormMassTimeStep() inside your FormFunction() method. This</div><div>has an argument X, the solution guess, which is read-only. However, you are calling DMLocalToGlobal()</div><div>using that X, which is illegal, since its read-only. Is this right?</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><div>
Best regards,<br>
Rongliang<br>
<br>
On 04/02/2016 06:20 PM, Dave May wrote:<br>
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<blockquote type="cite">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 2 April 2016 at 11:18, Rongliang
Chen <span dir="ltr"><<a href="mailto:rl.chen@siat.ac.cn" target="_blank">rl.chen@siat.ac.cn</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Shri,<br>
<br>
Thanks for your reply.<br>
<br>
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()?<br>
</blockquote>
<div><br>
</div>
<div>No - you should change it in your function
FormMassTimeStepFunction().<br>
</div>
<div>The input vector x passed into SNESComputeFunction() is
read only.<br>
</div>
<div> <br>
<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I tried it and I got a warning when I make the petsc:<br>
<br>
/home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c: In
function ‘DMLocalToGlobalBegin’:<br>
/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]<br>
In file included from
/home/rlchen/soft/petsc-3.6.3/include/petscmat.h:6:0,<br>
from /home/rlchen/soft/petsc-3.6.3/include/petscdm.h:6,<br>
from
/home/rlchen/soft/petsc-3.6.3/include/petsc/private/dmimpl.h:6,<br>
from
/home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c:1:<br>
/home/rlchen/soft/petsc-3.6.3/include/petscvec.h:420:29:
note: expected ‘const PetscScalar **’ but argument is of
type ‘PetscScalar **’<br>
<br>
Best regards,<br>
Rongliang<br>
<br>
---------------------<br>
Rongliang Chen, PhD<br>
Associate Professor<br>
<br>
Laboratory for Engineering and Scientific Computing<br>
Shenzhen Institutes of Advanced Technology<br>
Chinese Academy of Sciences<br>
Address: 1068 Xueyuan Avenue, Shenzhen University Town,
Shenzhen, Guangdong (518055), P. R. China<br>
E-mail: <a href="mailto:rl.chen@siat.ac.cn" target="_blank">rl.chen@siat.ac.cn</a><br>
Phone: <a href="tel:%2B86-755-86392312" value="+8675586392312" target="_blank">+86-755-86392312</a>
<div>
<div><br>
<br>
On 04/02/2016 05:03 PM, Abhyankar, Shrirang G. wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Use VecGetArrayRead instead of VecGetArray<br>
<br>
<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecGetArray" rel="noreferrer" target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecGetArray</a><br>
Read.html<br>
<br>
<br>
Shri<br>
<br>
-----Original Message-----<br>
From: Rongliang Chen <<a href="mailto:rl.chen@siat.ac.cn" target="_blank">rl.chen@siat.ac.cn</a>><br>
Date: Saturday, April 2, 2016 at 3:51 AM<br>
To: PETSc users list <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>>, "<a href="mailto:rongliang.chan@gmail.com" target="_blank">rongliang.chan@gmail.com</a>"<br>
<<a href="mailto:rongliang.chan@gmail.com" target="_blank">rongliang.chan@gmail.com</a>><br>
Subject: [petsc-users] Vec is locked read only<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Dear All,<br>
<br>
My code got the following error messages, but the
code works well for<br>
the petsc optimized version (--with-debugging=0).
Anyone can tell me how<br>
to fix this problem?<br>
<br>
Best regards,<br>
Rongliang<br>
<br>
<br>
[0]PETSC ERROR: --------------------- Error
Message<br>
--------------------------------------------------------------<br>
[0]PETSC ERROR: Object is in wrong state<br>
[0]PETSC ERROR: Vec is locked read only, argument
# 1<br>
[0]PETSC ERROR: See <a href="http://www.mcs.anl.gov/petsc/documentation/faq.html" rel="noreferrer" target="_blank">http://www.mcs.anl.gov/petsc/documentation/faq.html</a><br>
for trouble shooting.<br>
[0]PETSC ERROR: Petsc Release Version 3.6.3, Dec,
03, 2015<br>
[0]PETSC ERROR: ./Nwtun on a 64bit-debug named
rlchen by rlchen Sat Apr<br>
2 15:40:32 2016<br>
[0]PETSC ERROR: Configure options --download-blacs
--download-scalapack<br>
--download-metis --download-parmetis
--download-exodusii<br>
--download-netcdf --download-hdf5<br>
--with-mpi-dir=/home/rlchen/soft/Program/mpich2-shared<br>
--with-debugging=1 --download-fblaslapack
--download-chaco<br>
[0]PETSC ERROR: #1 VecGetArray() line 1646 in<br>
/home/rlchen/soft/petsc-3.6.3/src/vec/vec/interface/rvector.c<br>
[0]PETSC ERROR: #2 DMLocalToGlobalBegin() line
1913 in<br>
/home/rlchen/soft/petsc-3.6.3/src/dm/interface/dm.c<br>
[0]PETSC ERROR: #3 FormMassTimeStepFunction() line
191 in<br>
/home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/SetupF<br>
unctions.c<br>
[0]PETSC ERROR: #4 FormFunction() line 46 in<br>
/home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/SetupF<br>
unctions.c<br>
[0]PETSC ERROR: #5 SNESComputeFunction() line 2067
in<br>
/home/rlchen/soft/petsc-3.6.3/src/snes/interface/snes.c<br>
[0]PETSC ERROR: #6 SNESSolve_NEWTONLS() line 184
in<br>
/home/rlchen/soft/petsc-3.6.3/src/snes/impls/ls/ls.c<br>
[0]PETSC ERROR: #7 SNESSolve() line 3906 in<br>
/home/rlchen/soft/petsc-3.6.3/src/snes/interface/snes.c<br>
[0]PETSC ERROR: #8 SolveTimeDependent() line 843
in<br>
/home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/Nwtun.<br>
c<br>
[0]PETSC ERROR: #9 main() line 452 in<br>
/home/rlchen/soft/3D_fluid/FiniteVolumeMethod/PETScCodes/codefor3.6/Nwtun.<br>
c<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div>
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