Dear Developers,
>From the online documentation, both superlu and hypre have some gpu
functionalities. Can we use these gpu features through PETSc's interface?
Thank you.
Best,
Xiangdong
ctionality through PETSc?
Thank you.
Xiangdong
On Wed, Jan 15, 2020 at 2:22 PM Matthew Knepley wrote:
> On Wed, Jan 15, 2020 at 1:48 PM Xiangdong wrote:
>
>> In the ViennaCL manual
>> http://viennacl.sourceforge.net/doc/manual-algorithms.html
>>
>> It did expose t
LAIJMatrix *mat = (ViennaCLAIJMatrix*)gpustruct->mat;
ilu->CHOWILUVIENNACL = new
viennacl::linalg::chow_patel_ilu_precond
>(*mat, ilu_tag);
The default is used. Is it possible to expose these two parameters so that
user can change it through option keys?
Thank you.
Xiangdong
On Wed, Jan 15,
chowiluviennacl, but found
default factorization does not produce the exact factorization for
tridiagonal system. Can we tight the drop off tolerance so that it can work
as LU for tridiagonal system?
Thank you.
Xiangdong
On Wed, Jan 15, 2020 at 9:41 AM Matthew Knepley wrote:
> On Wed, Jan
dropping off tolerance like the
standard ilu?
Thank you.
Best,
Xiangdong
On Tue, Jan 14, 2020 at 10:05 PM Matthew Knepley wrote:
> On Tue, Jan 14, 2020 at 9:56 PM Xiangdong wrote:
>
>> Dear Developers,
>>
>> I have a quick question about the chowiluviennacl. When I tried to
I am using it correctly. Does chowiluviennacl work
for np>1?
In addition, are there option keys for the chowiluviennacl one can try?
Thank you.
Best,
Xiangdong
Thanks for pointing the function MatXAIJSetPreallocation() out. I followed
your suggestions and tried it on my problem:
preallocate the matrix with XAIJ, set its values by
MatSetValuesBlockedLocal, and use this matrix with aijcusparse.
It works!
Thank you.
Xiangdong
On Tue, Oct 29, 2019 at 8
Can anyone comment on the PETSc's GPU version of Block CSR, say
BAIJCUSPARSE? Does it make sense to have such format on GPU? Is it under
development?
Thank you.
Xiangdong
On Wed, Oct 23, 2019 at 11:36 AM Xiangdong wrote:
> Hello everyone,
>
> I am wondering whether the
neral
matrix A, I do not know the number of rows before calling MatLoad, how can
I specify the distribution of the matrix?
Thank you.
Best,
Xiangdong
On Thu, Jul 26, 2018 at 11:48 AM, Smith, Barry F.
wrote:
>
>
> > On Jul 26, 2018, at 10:34 AM, Xiangdong wrote:
> >
> > Hello everyone,
> >
> > I have a question about get the sub matrix Aodd from a MPIBAIJ matrix A.
> For example, if the bs=2 and the
"Index
set does not match blocks". It seems that MatCreateSubMatrix can only
provide the whole block, instead of just a specific component of that block.
Can you give me some suggestions on extracting the submatrix corresponding
to a specific component?
Thank you.
Best,
Xiangdong
Hello everyone,
If I solve a few matrices with same sparsity pattern by using
hypre_boomeramg pc, can I reuse the coarsening setup information?
Thank you.
Best,
Xiangdong
actor of 2?
Thank you.
Xiangdong
Below is my test code:
int main(int argc, char **argv)
{
PetscErrorCode ierr;
PetscInitialize(&argc, &argv, PETSC_NULL, PETSC_NULL);
int Nx=6, Ny=4, Nz=1;
DM da;
ierr = DMDACreate2d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,
DMDA_
type. DMCreateRestriction not
implemented for this type."
Can you help me get around this?
Another simple question, where can I find the explanation/meaning of
DMDA_Q0 and DMDA_Q1?
Below is my test example.
Thank you.
Best,
Xiangdong
#include
int main(int argc, char **argv)
{
PetscErro
/pipermail/petsc-users/2014-May/021520.html
Best,
Xiangdong
On Tue, Apr 17, 2018 at 5:24 PM, Smith, Barry F. wrote:
>
>Where are you call SNESGetSolution() from? Inside a SNES monitor
> routine, a SNES convergence test routine, a SNESLineSearchPostCheck()
> routine?
>
>
t the vector x returned from SNESGetSolution is locked read
only, Is it true?
If I want do some post processing by modifying the x after each nonlinear
iteration, how can I get the solution and modify it?
Thank you.
Best,
Xiangdong
On Tue, Apr 17, 2018 at 11:33 AM, Xiangdong wrote:
> Hello e
scLogFlops
<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Profiling/PetscLogFlops.html#PetscLogFlops>(n);
33: return(0); 34: }
Can w and x really be same vector in the VecPointwiseMax? Thanks.
Best,
Xiangdong
Hello everyone,
The latest Hypre has GPU capability. Can I use hypre GPU feature through
PETSc? If it is possible, what configuration changes should I make in PETSc?
Thank you.
Best,
Xiangdong
red in mdiag or
a->idiag+bs2*mbs. What is the purpose of storing this mdiag as an extra
copy of diagonal block? When will this mdiag be used?
Thank you.
Best,
Xiangdong
if (!a->idiag) {
38: PetscMalloc1(2*bs2*mbs,&a->idiag);
39: PetscLogObjectMemory((PetscObject)A,
MPIBAIJ consist of
one or two SeqBAIJ?
Can you show me a similar example of writing a method for MPIBAIJ based on
the SeqBAIJ method? The MatInvertBlockDiagonal is not similar, as that
method only involves the diagonal part A and without the off-diagonal part
B.
Thank you.
Xiangdong
On Wed, Feb 14
Thanks a lot, Barry! I see that you had implemented the bs=3 special case.
I will play with these codes and add at least bs=2 case and try to get it
working for parallel baij. I will let you know the update.
Thank you.
Xiangdong
On Wed, Feb 14, 2018 at 2:57 PM, Smith, Barry F. wrote:
>
>
Thanks.
Xiangdong
On Wed, Feb 14, 2018 at 9:49 AM, Smith, Barry F. wrote:
>
> Hmm, I never had this idea presented to me, I have no way to know if it
> is particularly good or bad. So essentially you transform the matrix
> "decoupling the physics alone the diagonal" an
Yes, the preconditioner is like a multi-stage pccomposite preconditioner.
In one stage, I just precondition a subset of matrix corresponding to
certain physical unknowns. To get a better decoupled submatrix, I need to
apply that operation.
Thanks.
Xiangdong
On Wed, Feb 14, 2018 at 9:39 AM
special preconditioners for the extracted/decoupled
matrix. The motivation is that after the transformation, one can get a
better decoupled matrix to preserve the properties of the unknowns.
Thanks.
Xiangdong
On Tue, Feb 13, 2018 at 6:27 PM, Smith, Barry F. wrote:
>
> In general you pr
have any suggestion on compute invdiag(A)*A for mpibaij matrix?
Thanks for your help.
Best,
Xiangdong
ELL format?
http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html
Thank you.
Xiangdong
On Mon, Nov 13, 2017 at 11:32 AM, Zhang, Hong wrote:
> Most operations in PETSc would not benefit much from vectorization since
> they are memory-bounded. But this does not discourage yo
Hello everyone,
Can someone comment on the vectorization of PETSc? For example, for the
MatMult function, will it perform better or run faster if it is compiled
with avx2 or avx512?
Thank you.
Best,
Xiangdong
Hi Barry,
Can you point me the documentation for understanding these iteration
patterns? Thanks a lot.
Best,
Xiangdong
On Fri, Sep 29, 2017 at 11:24 AM, Barry Smith wrote:
>
> They are all different iteration patterns. They definitely should
> present different residual results
&
,
Xiangdong
mpirun -np 1 ./extest -ksp_monitor -pc_type none
0 KSP Residual norm 1.414213562373e+00
1 KSP Residual norm 6.324555320337e-01
2 KSP Residual norm 3.779644730092e-01
3 KSP Residual norm 2.581988897472e-01
4 KSP Residual norm 1.906925178491e-01
5 KSP Residual norm
by
MatCreateVecs. I am using petsc 3.7.6 fortran api.
If I create the same B in non-block format, it works fine without the extra
vecset. It seems that I cannot reuse the allocation of vec y for block
matrix without a reset.
Is there any clue to explain this behavior?
Thank you.
Best,
Xiangdong
Hello everyone,
For the same sparse matrix, will the storage format (baij or aij) have a
noticeable performance effect on MatMult give the baij may have a better
locality?
Thank you.
Best,
Xiangdong
Hi Barry,
Thanks for your response. So these extra allocated memory is just a waste
of memory, but no harm for other mat related computation. Is it correct?
Thank you.
Xiangdong
On Fri, Aug 4, 2017 at 4:52 PM, Barry Smith wrote:
>
> > On Aug 4, 2017, at 2:52 PM, Xiangdo
unused memory cause?
Thank you.
Best,
Xiangdong
On Thu, Jun 8, 2017 at 3:17 PM, Hong wrote:
> Xiangdong:
> MatCreateMPIBAIJWithArrays() is obviously buggy, and not been tested.
>
>
>> 1) In the remark of the function MatCreateMPIBAIJWithArrays, it says " bs -
>> the block size, only a block size of 1 is supported
am
thinking of created two petsc baij matrix (M1baij and M2baij) by
calling MatCreateMPIBAIJWithArrays
twice and then call MATAXPY to get the sum M=M1baij + M2baij. Is there a
better way to do it?
Thank you.
Best,
Xiangdong
Thanks, Matt. For a cell in DMDA 3d with global id (ix,iy,iz), what is the
global row id of that cell corresponding to the matrix generated by
DMCreateMatrix? It is not always ix + iy*Nx + iz*Ny*Nx for
different da_processors_xyz, is it? How can I obtain that global row id?
Thanks.
Xiangdong
ed ex45 example, the diff file as well as the
run log.
Thanks for your help.
Best,
Xiangdong
diff --git a/ex45.c b/ex45.c
index b4bb565..6bcb074 100644
--- a/ex45.c
+++ b/ex45.c
@@ -117,8 +117,8 @@ PetscErrorCode ComputeMatrix(KSP ksp,Mat jac,Mat B,void
*ctx)
DM da;
PetscErrorCo
step. Any suggestions on this?
Thanks.
Best,
Xiangdong
On Fri, Jul 29, 2016 at 10:41 AM, Barry Smith wrote:
>
> > On Jul 27, 2016, at 4:42 PM, Xiangdong wrote:
> >
> > Hello everyone,
> >
> > I have a global dmda vector vg. On each processor, if I want to know the
> norm of local portion of vg, which functio
to call? like
*vg->ops->norm_local(vg,NORM_2, &normlocal)?
Thanks.
Best,
Xiangdong
preconditioned residual at a point different from
current solution, which function should I call?
Thanks.
Best,
Xiangdong
Sorry for the spam. I retyped the same command in front of my coworker, and
it just works.
Xiangdong
On Thu, Jun 30, 2016 at 1:50 PM, Xiangdong wrote:
> Hello everyone,
>
> I am trying to use totalview to debug my codes. For the same binary, in
> gdb, (gdb) p ((Vec_Seq*) v->
lue to fix this?
Thanks.
Xiangdong
this trap for nz=1?
Thanks.
Xiangdong
On Wed, Jun 29, 2016 at 11:23 AM, Xiangdong wrote:
> The code got trapped in a while loop when I switch to s=2.
>
> http://www.mcs.anl.gov/petsc/petsc-current/src/dm/impls/da/dadd.c.html
>
> In dadd.c line 85-96
> /* gone out of process
m not sure
this is the reason for the while loop trap.
Thanks.
Xiangdong
On Tue, Jun 28, 2016 at 5:16 PM, Barry Smith wrote:
>
> If you make the stencil width as wide at the overlap does the problem go
> away and you get expected convergence?
>
> > On Jun 28, 2016, at 3:48
information from cell 5 is not available on
processor 1.
Do you have any suggestion for the overlap case? Thank you.
Best,
Xiangdong
On Mon, Jun 27, 2016 at 4:21 PM, Barry Smith wrote:
>
> > On Jun 27, 2016, at 3:15 PM, Xiangdong wrote:
> >
> > Hello everyone,
> >
> >
quot;. The option
-pc_factor_nonzeros_along_diagonal does not fix this zero pivot issue.
Do you have any quick suggestions for me to try to fix this issue?
Thank you.
Best,
Xiangdong
DMDACreate2d(MPI_Comm comm,DMBoundaryType bx,DMBoundaryType
by,DMDAStencilType stencil_type, PetscInt M,PetscInt N,PetscInt m,PetscInt
n,PetscInt dof,PetscInt s,const PetscInt lx[],const PetscInt ly[],DM *da)
Thanks.
Xiangdong
On Fri, Jun 24, 2016 at 5:23 PM, Barry Smith wrote:
>
>
Hello everyone,
I have a quick question. What is the relationship between da_overlap and
the width parameter in dmdacreate2d?
>From the examples, it seems that width=1 works with da_overlap=4. Could you
please explain the relationship or point me to a reference page?
Thanks.
Xiangdong
aspin option.
In general, for the analytical Jacobian, should I put it into jac or jacpre
in the FormJaciban() function?
Thanks.
Best,
Xiangdong
On Mon, Jun 20, 2016 at 9:51 PM, Barry Smith wrote:
>
> Could you reproduce the error with a PETSc example or send us the code?
> If we
The snesview output says "SNES has not been set up so information may be
incomplete" as well as "Nonlinear Additive Schwarz: total subdomain blocks
= -2". Why are the total subdomain blocks negative?
Thanks.
Xiangdong
On Mon, Jun 20, 2016 at 1:49 PM, Xiangdong wrote:
&g
obian for me based on the information of old
Jacobian.
Do I need to provide something special to use the aspin?
Thanks.
Best,
Xiangdong
>
> Barry
>
> > On Jun 20, 2016, at 11:32 AM, Xiangdong wrote:
> >
> > Hello everyone,
> >
> > I am trying differe
evaluations=0
norm schedule ALWAYS
Thanks.
Xiangdong
On Mon, Jun 20, 2016 at 12:54 PM, Matthew Knepley wrote:
> Can you give us the output of -snes_view? It would help to see how you are
> setting everything up, or maybe
> run SNESView() before SNESSolve()?
>
>Matt
>
> On M
r messages are below.
Any hint for me to fix this? Thanks.
Best,
Xiangdong
[0]PETSC ERROR: - Error Message
--
[0]PETSC ERROR: No support for this operation for this object type
[0]PETSC ERROR: Mat type shell
[0]P
type: lu
PC has not been set up so information may be incomplete
LU: out-of-place factorization
tolerance for zero pivot 2.22045e-14
matrix ordering: natural
Thank you.
Best,
Xiangdong
What are you going to do with this matrix? Are you going to multiply this
matrix with another vector?
Xiangdong
On Wed, Feb 10, 2016 at 9:06 AM, wen zhao wrote:
> Hello
>
> I have another question about the multiplication of two vector with the
> form
>
> (x) * (x^T), whic
On Mon, Feb 8, 2016 at 6:45 PM, Jed Brown wrote:
> Xiangdong writes:
>
> > iii) since the time ratios of VecDot (2.5) and MatMult (1.5) are still
> > high, I rerun the program with ipm module. The IPM summary is here:
> >
> https://drive.google.com/file/d/0BxEfb1tas
On Mon, Feb 8, 2016 at 6:45 PM, Jed Brown wrote:
> Xiangdong writes:
>
> > iii) since the time ratios of VecDot (2.5) and MatMult (1.5) are still
> > high, I rerun the program with ipm module. The IPM summary is here:
> >
> https://drive.google.com/file/d/0BxEfb1tas
his related to the hardware and network (which
the users cannot control) or can I do something on my codes to improve?
Thank you.
Best,
Xiangdong
On Fri, Feb 5, 2016 at 10:34 PM, Barry Smith wrote:
>
> Make the same run with no IO and see if the numbers are much better and
> if the
If I want to know whether only rank 0 is slow (since it may has more io) or
actually a portion of cores are slow, what tools can I start with?
Thanks.
Xiangdong
On Fri, Feb 5, 2016 at 5:27 PM, Jed Brown wrote:
> Matthew Knepley writes:
> >> I attached the full summary. At the
On Fri, Feb 5, 2016 at 12:18 PM, Matthew Knepley wrote:
> On Fri, Feb 5, 2016 at 11:12 AM, Xiangdong wrote:
>
>> Hello everyone,
>>
>> When I looked at the log_summary, I found that flops ratio of VecDot is
>> 1.1, but the time ratio is 1.8. Also the flops ratio
it worth
looking into these imbalance issue? If yes, how do I know which procs are
causing the issue? What tools should I start with?
Thanks.
Xiangdong
Event
On Tue, Feb 2, 2016 at 3:11 PM, Satish Balay wrote:
> On Tue, 2 Feb 2016, Xiangdong wrote:
>
> > On Tue, Feb 2, 2016 at 2:27 PM, Satish Balay wrote:
> >
> > > On Tue, 2 Feb 2016, Barry Smith wrote:
> > >
> > > >
> > > > > On Feb
On Tue, Feb 2, 2016 at 2:27 PM, Satish Balay wrote:
> On Tue, 2 Feb 2016, Barry Smith wrote:
>
> >
> > > On Feb 2, 2016, at 9:21 AM, Xiangdong wrote:
> > >
> > > the package is untar and compiled in $PETSC_ARCH/externalpackages, but
> the original t
the package is untar and compiled in $PETSC_ARCH/externalpackages, but the
original tarball .tar file is deleted. Is it correct?
Xiangdong
On Tue, Feb 2, 2016 at 10:15 AM, Matthew Knepley wrote:
> On Tue, Feb 2, 2016 at 9:15 AM, Xiangdong wrote:
>
>> Not really. My question
Not really. My question is if I use download-pastix=1, which directory is
the tarball (package pastix_5.2.2.20.tar.bz2) downloaded into?
Thanks.
Xiangdong
On Tue, Feb 2, 2016 at 9:59 AM, Matthew Knepley wrote:
> On Tue, Feb 2, 2016 at 8:46 AM, Xiangdong wrote:
>
>> Hello everyone
connection and
install petsc there.
Thanks.
Xiangdong
On Mon, Feb 1, 2016 at 5:26 PM, Barry Smith wrote:
>
> > On Feb 1, 2016, at 2:16 PM, Barry Smith wrote:
> >
> >
> >> On Feb 1, 2016, at 1:46 PM, Xiangdong wrote:
> >>
> >> Hello everyone,
> >>
> >> I have a question on snes wit
It seems that TSAdaptChoose_Basic only uses the local truncation error to
predict the next time step. Do you also include the number of snes
iterations in computing the next time step in some adapt option?
Thanks.
Xiangdong
On Mon, Feb 1, 2016 at 4:52 PM, Jed Brown wrote:
> Xiangdong wri
dt_current,
namely, dt_next = dt_current*func(snesits, etc), which function/file should
I look into?
Thanks.
Xiangdong
On Mon, Feb 1, 2016 at 3:16 PM, Barry Smith wrote:
>
> > On Feb 1, 2016, at 1:46 PM, Xiangdong wrote:
> >
> > Hello everyone,
> >
> > I have a
linesearch_bt, but can converge with linesearch_basic (using
same initial guess). For the same problem, there are also some steps, at
which linearsearch_basic fails, but linesearch_bt converges. Is there a
general guide line to decide whether linesearch should be used?
Thanks.
Xiangdong
I am thinking to use parmetis to repartition the mesh (based on new updated
weights for vertices), and use some functions (maybe DMPlexMigrate) to
redistribute the data. I will look into Matt's paper to see whether it is
possible.
Thanks.
Xiangdong
On Thu, Jan 28, 2016 at 2:41 PM, Ma
What functions/tools can I use for dynamic migration in DMPlex framework?
Can you also name some external mesh management systems? Thanks.
Xiangdong
On Thu, Jan 28, 2016 at 12:21 PM, Barry Smith wrote:
>
> > On Jan 28, 2016, at 11:11 AM, Xiangdong wrote:
> >
> > Yes, it
partition to another partition? I am wondering whether there are
some functions or libraries help me manage this redistribution.
Thanks.
Xiangdong
On Thu, Jan 28, 2016 at 12:20 AM, Jed Brown wrote:
> Xiangdong writes:
>
> > I have a question on dynamic load balance in petsc. I start
-partition the mesh
and continue the simulation?
Thanks.
Xiangdong
Hello everyone,
Instead of using the standard atol, rtol, stol etc, can user define a new
stopping criterion for snes? For example, if I want to use a specialized
norm as my snes stopping criteria, which functions should I call to pass
this information?
Thank you.
Best,
Xiangdong
Each time I call my Jacobian function, it generates the Jacoiban matrix
from scratch by inserting entries. The result of this assembling process
gives the same nonzero pattern as in the previous iteration. Can SNES/KSP
track this too?
Thanks.
Xiangdong
On Wed, Sep 9, 2015 at 5:01 PM, Barry
.
Xiangdong
time, how can I define a
struct with dof doubles?
Thank you.
Best,
Xiangdong
Is there any reason that AD is not supported in PETSc? Is it because the
ADIFOR/ADIC library itself?
Thank you.
Xiangdong
On Wed, Oct 1, 2014 at 4:09 PM, Barry Smith wrote:
>
>
> Sorry that functionality is no longer in PETSc.
>
>
> On Oct 1, 2014, at 2:51 PM, Xiangdong
Hello everyone,
Could you please point me to examples of using automatic differentiation
for Jacobian calculation in PETSc? Chapter 9 of the manual briefly talked
about adifor, but seems not quite complete.
Thank you.
Xiangdong
the network between the nodes. Could these factors cause these different
behaviors?
Thank you.
Best,
Xiangdong
simply replacing -log_summary with -log_view ::ascii_info_detail does not
produce anything. (Sams as -log_view ascii:filename:ascii_info_detail.)
Where does it dump the log? Is this the feature of new petsc? I am using
petsc-3.4.3.
Thanks.
Xiangdong
On Fri, Aug 22, 2014 at 2:53 PM, Barry Smith
Hello everyone,
In the PETSc log_summary, it outputs the Max flops, the ratio of Max/Min
flops. If it is far from 1.0, I would like to know the distributions of
flops among all the procs. How can I obtain the flops performed on each
proc?
Thank you.
Best,
Xiangdong
A's entries to
build another DMDA matrices B, what is the best way to retrieve A's
entries? Is it possible to use grid indexing?
Thank you.
Best,
Xiangdong
gle field.
Thank you.
Best,
Xiangdong
On Fri, May 2, 2014 at 4:10 PM, Matthew Knepley wrote:
> On Fri, May 2, 2014 at 12:53 PM, Xiangdong wrote:
>>
>> On Thu, May 1, 2014 at 10:21 PM, Barry Smith wrote:
>>
>>>
>>> On May 1, 2014, at 9:12 PM, Xiangdong wrote:
>>>
>>&
On Thu, May 1, 2014 at 10:21 PM, Barry Smith wrote:
>
> On May 1, 2014, at 9:12 PM, Xiangdong wrote:
>
> > I came up with a simple example to demonstrate this "eliminating row"
> behavior. It happens when the solution x to the linearized equation Ax=b
nonlinear equations, it is likely that the solution of the
linearized equation is out of bound, but then we can reset the out-of-bound
solution to be lower or upper bound instead of eliminating the variables
(the rows). Any suggestions on doing this in petsc?
Thank you.
Best,
Xiangdong
P.S. If we
e correct vector of residue.
Are the orders of function calls correct?
Thank you.
Xiangdong
On Thu, May 1, 2014 at 1:58 PM, Barry Smith wrote:
>
> On May 1, 2014, at 10:32 AM, Xiangdong wrote:
>
> > Under what condition, SNESGetFunctionNorm() will output different
> r
. Eliminating these rows would give
wrong solutions.
Thank you.
Xiangdong
On Tue, Apr 29, 2014 at 3:12 PM, Matthew Knepley wrote:
> On Tue, Apr 29, 2014 at 2:09 PM, Xiangdong wrote:
>
>> It turns out to a be a bug in my FormFunctionLocal(DMDALocalInfo
>> *info,PetscScalar *
:
The snes_fd, snes_fd_color and my own Jacobian work fine separately, but
-snes_type test complains the same error message Que mentioned before.
Thanks.
Xiangdong
On Tue, Apr 15, 2014 at 12:31 PM, Barry Smith wrote:
>
> On Apr 15, 2014, at 11:09 AM, Peter Brune
array of vecx_local_array, copy the x to
vecx_local_array, scatter to global vecx and output vecx. Is there a quick
way to restore the array x to a vector and output?
Thank you.
Best,
Xiangdong
On Mon, Apr 28, 2014 at 10:28 PM, Barry Smith wrote:
>
> On Apr 28, 2014, at 3:23 PM, Xia
Hello everyone,
When I run snes program, it outputs "SNES Function norm 1.23456789e+10". It
seems that this norm is different from residue norm (even if solving
F(x)=0) and also differ from norm of the Jacobian. What is the definition
of this "SNES Function Norm"?
Thank you.
Best,
Xiangdong
tsc-current/docs/manualpages/SNES/SNESComputeFunction.html
Thanks.
Xiangdong
On Wed, Apr 9, 2014 at 2:15 PM, Barry Smith wrote:
>
> SNESFunction is not a function. What do you think it is suppose to
> compute? You provide a function for evaluating the nonlinear function with
>
On Wed, Apr 9, 2014 at 11:40 AM, Matthew Knepley wrote:
> On Wed, Apr 9, 2014 at 10:38 AM, Xiangdong wrote:
>
>> Hello everyone,
>>
>> When add this line to src/ex3.c
>>
>> SNESFunction(snes,x,fval,&ctx);
>>
>> The compiler complains that
Thank you.
Xiangdong
ter>0 fixed the matrix unassemble problem.
Thanks a lot for mentioning the -mat_view options.
Xiangdong
>
>BTW: there is a lot of built in viewing of PETSc matrices you can do
> without writing your own monitor. For example in the master development of
> PETSc yo
till crashes by reporting
argument out of range in MatSetValues_SeqAIJ() or MatSetValues_MPIAIJ().
Any suggestions?
Thank you.
Xiangdong
On Fri, Apr 4, 2014 at 5:15 PM, Xiangdong wrote:
>
>
>
> On Fri, Apr 4, 2014 at 5:02 PM, Peter Brune wrote:
>
>>
>>
>>
>> On Fri, Apr 4, 2014 at 3:57 PM, Xiangdong wrote:
>>
>>> Hello everyone,
>>>
>>> If we use -snes_
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