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<div class="moz-cite-prefix">Hi Matt,<br>
<br>
That's right. The FormMassTimeStep() is inside the FormFunction()
and I call the FormFunction() in this way:
SNESSetFunction(user->snes, algebra->f, FormFunction,
(void*)user). How can I know the X is read-only or not? <br>
<br>
If I do not use the SNESSolve, that is I use the explicit method
with the same function FormMassTimeStep(), this error disappeared.
So it seems that the SNESSolve locked the vector X. <br>
<br>
Best regards,<br>
Rongliang<br>
<br>
<pre class="moz-signature" cols="72">
</pre>
On 04/02/2016 07:59 PM, Matthew Knepley wrote:<br>
</div>
<blockquote
cite="mid:CAMYG4Gn8Ps9_-juTYoZOE=4vo9x+sZ3P5SO2PDE8JD_D5bD6Yw@mail.gmail.com"
type="cite">
<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
moz-do-not-send="true" 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">
<div bgcolor="#FFFFFF" text="#000000">
<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>
</div>
<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
moz-do-not-send="true"
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 moz-do-not-send="true"
href="mailto:rl.chen@siat.ac.cn"
target="_blank">rl.chen@siat.ac.cn</a><br>
Phone: <a moz-do-not-send="true"
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 moz-do-not-send="true"
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
moz-do-not-send="true"
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
moz-do-not-send="true"
href="mailto:petsc-users@mcs.anl.gov"
target="_blank">petsc-users@mcs.anl.gov</a>>,
"<a moz-do-not-send="true"
href="mailto:rongliang.chan@gmail.com"
target="_blank">rongliang.chan@gmail.com</a>"<br>
<<a moz-do-not-send="true"
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
moz-do-not-send="true"
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>
</blockquote>
<br>
</blockquote>
<br>
<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
<br>
</div>
</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>
</div>
</div>
</blockquote>
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