Hi,
We have been using PETSc’s block version of the AIJ matrix format to implement
fully coupled multiphysics problems using finite elements.
Are there specific advantages to moving toward DMPlex for finite element-based
coupled multi-physics implementation? Can you still access Hypre? Does the
Hello,
I would like to make the following hypre call
HYPRE_AMSSetBetaPoissonMatrix(ams, NULL);
So it does look like ams_beta_is_zero has to be true
https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/pc/impls/hypre/hypre.c?ref_type=heads*L325__;Iw!!G_uCfscf7eWS!bi4rdSrr
petscErr = PCHYPRESetDiscreteGradient(pc, par_G);
// Set vertex coordinates
petscErr = PCHYPRESetEdgeConstantVectors(pc, par_xvec, par_yvec, par_zvec);
From: Matthew Knepley
Date: Monday, 9 September 2024 at 21:11
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: Stefano Zampini , petsc-users@
,HC)
Cc: Stefano Zampini , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Hypre AMS usage
On Mon, Sep 9, 2024 at 3:38 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I didn’t know how to check the pc type but adding
petscErr = PCSetType(pc,
ate: Monday, 9 September 2024 at 19:46
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: Stefano Zampini , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Hypre AMS usage
On Mon, Sep 9, 2024 at 2:18 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Calli
Zampini , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Hypre AMS usage
On Mon, Sep 9, 2024 at 1:21 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hi Stefano,
Thank you. That was helpful. I tried the following:
petscErr = PetscOptionsSe
n (STFC,DL,HC)
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
Cc: petsc-users@mcs.anl.gov<mailto:petsc-users@mcs.anl.gov>
mailto:petsc-users@mcs.anl.gov>>
Subject: Re: [petsc-users] Hypre AMS usage
On Fri, Sep 6, 2024 at 11:37 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-user
:37 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hello,
I am trying to use the Hypre AMS preconditioner for the first time.
I am following the example problem from Hypre
https://urldefense.us/v3/__https://github.com/hypre-spac
Hello,
I am trying to use the Hypre AMS preconditioner for the first time.
I am following the example problem from Hypre
https://urldefense.us/v3/__https://github.com/hypre-space/hypre/blob/3caa81955eb8d1b4e35d9b450e27cf6d07b50f6e/src/examples/ex15.c*L954__;Iw!!G_uCfscf7eWS!biuCOXkV-qD-e8iTXiwaD9
properly for both x and y
in y = Ax when A is not square.
On Sep 5, 2024, at 5:20 PM, Karthikeyan Chockalingam - STFC UKRI via
petsc-users wrote:
Hello,
I am unsure why the program crashes even while running the code serially
petscErr = MatCreate(mesh.comm().get(), &par_G);
pets
Hello,
I am unsure why the program crashes even while running the code serially
petscErr = MatCreate(mesh.comm().get(), &par_G);
petscErr = MatSetType(par_G, MATMPIAIJ);
petscErr = MatSetSizes(par_G, local_num_rows, local_num_cols,
total_num_rows, total_num_cols);
PetscInt d_nz = 2;
Hello,
When PETSc is installed with GPU support, will it run only on GPUs or can it be
run on CPUs (without GPUs)? Currently, PETSc crashes when run on CPUs.
Thank you.
Best regards,
Karthik.
--
Karthik Chockalingam, Ph.D.
Senior Research Software Engineer
High Performance Systems Engineering
-users] Coupled system of equations on unstructured mesh
On Sat, Sep 23, 2023 at 6:00 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I just would like to clarify a couple of things.
1)The M and N, in MatCreateBIJ, refer to the actual number of globa
Sun, Sep 10, 2023 at 5:00 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I get it.
Q1) In other words when using MatSetValuesBlocked, for bs = 2, I could pass all
64 entrees of the element matrix row-oriented by setting m = n = 4 (along wit
Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I don’t see an option to give block size.
https://petsc.org/release/manualpages/Mat/MatCreateAIJ/
https://petsc.org/release/manualpages/Mat/MatSetBlockSize/
Thanks,
Matt
Many thanks,
Karthik.
system of equations on unstructured mesh
On Sun, Sep 10, 2023 at 3:01 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I will solve the coupled problem in a non-linear fashion using SNES, so I will
have one residual for each variable R(u1) and R(u2) a
gards,
Karthik.
From: Matthew Knepley
Date: Sunday, 10 September 2023 at 19:03
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Coupled system of equations on unstructured mesh
On Sun, Sep 10, 2023 at 1:48 PM Karthikeyan Chockalingam - STFC UKRI via
Hello,
I have so far solved scalar field problems using finite elements on a given
(unstructured) mesh. I made use of MATMPIAIJ to create matrixes,
MatCreateVecs(A, &b, &x) to create vectors, and MatZeroRowsColumnsIS to set
boundary conditions.
Now, I would like to solve a coupled system of eq
.
From: Matthew Knepley
Date: Thursday, 7 September 2023 at 14:32
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: Stefano Zampini , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Non-linear solve: DIVERGED_LINE_SEARCH
On Thu, Sep 7, 2023 at 9:28 AM Karthikeyan Chockalingam - STFC UKRI
Zampini , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Non-linear solve: DIVERGED_LINE_SEARCH
On Thu, Sep 7, 2023 at 8:49 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
I just noticed that the line search diverges even for the linear P
accuracy do you want?
Il giorno gio 7 set 2023 alle ore 13:08 Karthikeyan Chockalingam - STFC UKRI
via petsc-users mailto:petsc-users@mcs.anl.gov>> ha
scritto:
Hello,
The non-linear solution diverged. The final solution seems right and I believe
the Jacobian is correct (not 100% certain).
I
Chockalingam - STFC UKRI
via petsc-users mailto:petsc-users@mcs.anl.gov>> ha
scritto:
Hello,
The non-linear solution diverged. The final solution seems right and I believe
the Jacobian is correct (not 100% certain).
I am not sure if I doing something wrong in the solver setting.
0 SNES Functio
Hello,
The non-linear solution diverged. The final solution seems right and I believe
the Jacobian is correct (not 100% certain).
I am not sure if I doing something wrong in the solver setting.
0 SNES Function norm 3.890991210938e-03
0 KSP Residual norm 9.037762538598e+00
1 KSP Res
exist.
On Jul 18, 2023, at 12:03 PM, Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thank you, Barry. I am using the MPIAIJ format for a Finite Element
application. So, I am trying to understand what is implemented in DMDA to
eliminate th
nate extra ones
On Jul 18, 2023, at 11:51 AM, Karthikeyan Chockalingam - STFC UKRI via
petsc-users wrote:
Yes, I clearly understand I need to eliminate one set of periodic nodes. I was
hoping to use x = P x’ to eliminate one set. It is a kind of mapping.
Sorry, I am not sure if it is the Loc
-users@mcs.anl.gov<mailto:petsc-users@mcs.anl.gov>
mailto:petsc-users@mcs.anl.gov>>
Subject: Re: [petsc-users] periodic boundary conditions
On Tue, Jul 18, 2023 at 9:02 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hello,
This i
: [petsc-users] periodic boundary conditions
On Tue, Jul 18, 2023 at 9:02 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hello,
This is exactly not a PETSc question. I am solving a Poisson equation using
finite elements. I would like to impose
Hello,
This is exactly not a PETSc question. I am solving a Poisson equation using
finite elements. I would like to impose PBC. I am thinking of using the
Lagrange multiplier method to impose them as constraints. Or do you think I
could take an alternative approach?
Thank you for your help.
K
Hello,
I would like to perform the following operation
[P^T A P] x’ = P^T f
Where P is a rectangular matrix and A is a square matrix. All the matrixes are
constructed using MPIAIJ.
Should I be concerned about the parallel partitioning of the matrix P and A?
Or can I just go ahead and use Mat
users@mcs.anl.gov
Subject: Re: [petsc-users] Node numbering in parallel partitioned mesh
On Tue, May 2, 2023 at 8:25 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hello,
This is not exactly a PETSc question. I have a parallel partitioned fini
Hello,
This is not exactly a PETSc question. I have a parallel partitioned finite
element mesh. What are the steps involved in having a contiguous but unique set
of node numbering from one partition to the next? There are nodes which are
shared between different partitions. Moreover, this parti
: [petsc-users] Setting up a matrix for Lagrange multiplier
On Mon, Apr 24, 2023 at 1:37 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Great to know there is an example now.
Yes, -pc_fieldsplit_defect_saddle_point worked.
But I would like to unde
k.
From: Matthew Knepley
Date: Monday, 24 April 2023 at 17:57
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Setting up a matrix for Lagrange multiplier
On Mon, Apr 24, 2023 at 10:22 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin.
ue, Apr 18, 2023 at 5:24 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hello,
I'm solving a problem using the Lagrange multiplier, the matrix has the form
K = [A P^T
P 0]
I am familiar with constructing K using MATMPIAIJ. However, I wou
From: petsc-users on behalf of Matthew
Knepley
Sent: Thursday, April 20, 2023 5:37 AM
To: Karthikeyan Chockalingam - STFC UKRI
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] question about MatSetLocalToGlobalMapping
On Thu, Apr 20, 2023 at 6:13 AM Karthikeyan Chockalingam - STFC UKRI
col_mapping);
for (i=0; i
Date: Thursday, 20 April 2023 at 11:37
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] question about MatSetLocalToGlobalMapping
On Thu, Apr 20, 2023 at 6:13 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users
Hello,
I created a new thread, thought would it be more appropriate (and is a
continuation of my previous post). I want to construct the below K matrix
(which is composed of submatrices)
K = [A P^T
P 0]
Where K is of type MatMPIAIJ. I first constructed the top left [A] using
MatSetVa
eyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thank you for your response. I spend some time understanding how
MatSetValuesLocal and ISLocalToGlobalMappingCreate work.
You can look at SNES ex28 where we do this with DMCOMPOSITE.
Q1) Will the matrix K
: Matthew Knepley
Date: Tuesday, 18 April 2023 at 11:08
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Setting up a matrix for Lagrange multiplier
On Tue, Apr 18, 2023 at 5:24 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users
Hello,
I'm solving a problem using the Lagrange multiplier, the matrix has the form
K = [A P^T
P 0]
I am familiar with constructing K using MATMPIAIJ. However, I would like to
know if had [A], can I augment it with [P], [P^T] and [0] of type MATMPIAIJ?
Likewise for vectors as well.
C
Hi,
I am trying to solve the below parabolic system for a constant time interval dt
(M + dt * K) x = M * x^(old)
Where,
M – Mass matrix
K – Stiffness matrix
A = M + dt * K (remains constant)
I apply the boundary condition using MatZeroRowsColumns. For homogenous
boundary conditions, I notice
ierr = PetscOptionsSetValue(NULL,"-redistribute_pc_hypre_type",
"boomeramg");
Many thanks,
Karthik.
From: Barry Smith
Date: Tuesday, 7 February 2023 at 19:52
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Eliminating rows
!
Karthik.
From: Matthew Knepley
Date: Monday, 6 February 2023 at 21:52
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: Barry Smith , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Eliminating rows and columns which are zeros
On Mon, Feb 6, 2023 at 4:45 PM Karthikeyan Chockalingam - STFC UKRI
.
Barry
On Feb 4, 2023, at 12:06 PM, Karthikeyan Chockalingam - STFC UKRI
wrote:
Thank you very much for offering to debug.
I built PETSc along with AMReX, so I tried to extract the PETSc code alone
which would reproduce the same error on the smallest sized problem possible.
I have atta
problem with a simple code I can debug the
problem and fix it.
Barry
On Feb 3, 2023, at 6:42 PM, Karthikeyan Chockalingam - STFC UKRI
wrote:
I updated the main branch to the below commit but the same problem persists.
[0]PETSC ERROR: Petsc Development GIT revision: v3.18.4-529-g995ec06f92 GIT
required that a row exist
before we zeroed it but now we allow the row to initially have no entries and
still be zeroed.
Barry
On Feb 3, 2023, at 1:04 PM, Karthikeyan Chockalingam - STFC UKRI
wrote:
Thank you. The entire error output was an attachment in my previous email. I am
pasting here for
@mcs.anl.gov
Subject: Re: [petsc-users] Eliminating rows and columns which are zeros
On Fri, Feb 3, 2023 at 1:05 PM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Thank you. The entire error output was an attachment in my previous email. I am
pasting he
, 2023, at 11:41 AM, Karthikeyan Chockalingam - STFC UKRI
wrote:
Hello Barry,
I would like to better understand pc_type redistribute usage.
I am plan to use pc_type redistribute in the context of adaptive mesh
refinement on a structured grid in 2D. My base mesh (level 0) is indexed from 0
to N
contain correct values for ALL the locations
including the (zeroed out rows). You use case is exactly what redistribute it
for.
Barry
On Jan 10, 2023, at 11:25 AM, Karthikeyan Chockalingam - STFC UKRI
wrote:
Thank you Barry. This is great!
I plan to solve using ‘-pc_type redistribute’ after
-pc_type redistribute
It does everything for you. Note that if the right hand side for any of the
"zero" rows is nonzero then the system is inconsistent and the system does not
have a solution.
Barry
On Jan 10, 2023, at 10:30 AM, Karthikeyan Chockalingam - STFC UKRI via
p
Hello,
I am assembling a MATIJ of size N, where a very large number of rows (and
corresponding columns), are zeros. I would like to potentially eliminate them
before the solve.
For instance say N=7
0 0 0 0 0 0 0
0 1 -1 0 0 0 0
0 -1 2 0 0 0 -1
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0
l index of the
nonzero for each nonzero in Q, i=0:n.
Do some sort of vec-scatter-to-all with R to get what you want.
Does that work?
Mark
On Fri, Dec 9, 2022 at 3:25 PM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
That is where I am stu
e n, then set R[i] = global index of the
nonzero for each nonzero in Q, i=0:n.
Do some sort of vec-scatter-to-all with R to get what you want.
Does that work?
Mark
On Fri, Dec 9, 2022 at 3:25 PM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
T
, 2022, at 2:28 PM, Karthikeyan Chockalingam - STFC UKRI via
petsc-users wrote:
Hi,
I want to take the union of a set of sequential vectors, each living in a
different processor.
Say,
Vec_Seq1 = {2,5,7}
Vec_Seq2 = {5,8,10,11}
Vec_Seq3 = {5,2,12}.
Finally, get the union of all them Vec
Hi,
I want to take the union of a set of sequential vectors, each living in a
different processor.
Say,
Vec_Seq1 = {2,5,7}
Vec_Seq2 = {5,8,10,11}
Vec_Seq3 = {5,2,12}.
Finally, get the union of all them Vec = {2,5,7,8,10,11,12}.
I initially wanted to create a parallel vector and insert the (seq
Hello,
I have system matrix which is symmetric and thought I could make use of
MatCreateSBAIJ. I don’t understand how to set the blocksize bs. I believe it
has taken into account, when having multiple components/dofs per node.
(i) Currently, I have only one scalar field to solve so
ation of block Jacobi, so these results look fine to me, at least up to
this point.
Mark
On Thu, Nov 17, 2022 at 9:37 AM Karthikeyan Chockalingam - STFC UKRI via
petsc-users mailto:petsc-users@mcs.anl.gov>> wrote:
Hi Matt and Hong,
Thank you for your response.
I made the following changes
Thank you. It worked!
Best,
Karthik.
From: Pierre Jolivet
Date: Friday, 18 November 2022 at 13:56
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] PetscOptionsSetValue syntax
On 18 Nov 2022, at 2:47 PM, Karthikeyan Chockalingam - STFC UKRI
: Pierre Jolivet
Date: Friday, 18 November 2022 at 13:36
To: Chockalingam, Karthikeyan (STFC,DL,HC)
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] PetscOptionsSetValue syntax
On 18 Nov 2022, at 2:32 PM, Karthikeyan Chockalingam - STFC UKRI via
petsc-users wrote:
Hello,
I would like
Hello,
I would like to move from code to using options.
KSP ksp;
PCpc;
KSPCreate(PETSC_COMM_WORLD, &ksp);
KSPSetOperators(ksp, A, A);
I tried using PetscOptionsSetValue as below
ierr = PetscOptionsSetValue(NULL,"-ksp_type", "cg"); CHKERRQ(ierr);
ie
DL,HC)
Cc: Zhang, Hong , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Different solution while running in parallel
On Thu, Nov 17, 2022 at 11:13 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hi Matt,
I tested two sizes manually for the Po
consistent RHS.
Thanks,
Matt
On Thu, Nov 17, 2022 at 9:37 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hi Matt and Hong,
Thank you for your response.
I made the following changes, to get the desired output
PetscReal norm; /* n
users@mcs.anl.gov>> wrote:
Karhik,
Can you find out the condition number of your matrix?
Also, run using
-ksp_view -ksp_monitor_true_residual -ksp_converged_reason
and send the two outputs.
Thanks,
Matt
Hong
From: petsc-users
mailto:petsc-users-b
Also, run using
-ksp_view -ksp_monitor_true_residual -ksp_converged_reason
and send the two outputs.
Thanks,
Matt
Hong
From: petsc-users
mailto:petsc-users-boun...@mcs.anl.gov>> on
behalf of Karthikeyan Chockalingam - STFC UKRI via petsc-use
Hello,
I tried to solve a (FE discretized) Poisson equation using PCLU. For some
reason I am getting different solutions while running the problem on one and
two cores. I have attached the output file (out.txt) from both the runs. I am
printing A, b and x from both the runs – while A and
Hello,
Is there a way one can use AmgX multigrid via PETSc?
Kind regards,
Karthik.
This email and any attachments are intended solely for the use of the named
recipients. If you are not the intended recipient you must not use, disclose,
copy or distribute this email or any of its attachments a
t this
point.
Mark
Mark
On Tue, Dec 14, 2021 at 2:42 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I tried adding the -mat_block_size 3 but I still get the same error message.
Thanks,
Karthik.
From: Mark Adams mailto:mfad...@lbl.gov>>
Date
s] Unstructured mesh
Try adding -mat_block_size 3
On Mon, Dec 13, 2021 at 11:57 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I tried to run the problem using -pc_type hypre but it errored out:
./ex56 -cells 4,4,2 -max_conv_its 1 -lx 1. -alph
kills them.
--
From: Mark Adams
Date: Monday, 13 December 2021 at 13:58
To: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: Matthew Knepley , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Mon, Dec 13, 2021 at 8:35 AM Karthikeyan Chockalingam - STFC UKRI
keyan (STFC,DL,HC)"
Cc: Mark Adams , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Mon, Dec 13, 2021 at 9:40 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
@Mark Adams<mailto:mfad...
quot;Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: Matthew Knepley , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Mon, Dec 13, 2021 at 8:35 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thanks Ma
nstructured mesh
On Mon, Dec 13, 2021 at 7:15 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thank you. I was able to confirm both the below options produced the same mesh
./ex56 -cells 2,2,1 -max_conv_its 2
./ex56 -cells 4,4,2 -max_conv_it
arthik.
From: Mark Adams
Date: Sunday, 12 December 2021 at 23:00
To: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: Matthew Knepley , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Sun, Dec 12, 2021 at 3:19 PM Karthikeyan Chockalingam - STFC UKRI
ma
ers@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Fri, Dec 10, 2021 at 1:11 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thank you that worked. I have attached the output of the run
./ex56 -cells 2,2,1 -max_co
: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Fri, Dec 10, 2021 at 10:49 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thank you for your response.
I tried
: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Fri, Dec 10, 2021 at 7:42 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hi Matt,
I intend to perform
day, 2 December 2021 at 10:57
To: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] Unstructured mesh
On Thu, Dec 2, 2021 at 3:33 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hel
Hello,
I am able to successfully run hypre on gpus but the problem seems to
consumption a lot of memory. I ran ksp/ksp/tutorial/ex45 on a grid of 320 x
320 x 320 using 6 gpus by the following options
mpirun -n 6 ./ex45 -da_grid_x 320 -da_grid_y 320 -da_grid_z 320 -dm_mat_type
hypre -dm_vec_t
Hello,
Are there example tutorials on unstructured mesh in ksp? Can some of them run
on gpus?
Kind regards,
Karthik.
This email and any attachments are intended solely for the use of the named
recipients. If you are not the intended recipient you must not use, disclose,
copy or distribute thi
Hello,
I would like to understand why more memory is consumed by -pc_type gamg
compared to -pc_type mg for the same problem size
ksp/ksp/tutorial: ./ex45 -da_grid_x 368 -da_grid_x 368 -da_grid_x 368 -ksp_type
cg
-pc_type mg
Maximum (over computational time) process memory:total 1.9399
On Mon, Nov 22, 2021 at 10:20 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thanks Stefano,
I just did a clean build with no problems. Can you try a clean build of main?
Thanks,
Matt
I have another build without the --download-hypre-commi
ypre on gpus
On Mon, Nov 22, 2021 at 10:20 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thanks Stefano,
I just did a clean build with no problems. Can you try a clean build of main?
Thanks,
Matt
I have another build without the --do
v"
Subject: Re: [petsc-users] hypre on gpus
You don't need to specify the HYPRE commit. Remove
--download-hypre-commit=origin/hypre_petsc from the configuration options
Il giorno lun 22 nov 2021 alle ore 17:29 Matthew Knepley
mailto:knep...@gmail.com>> ha scritto:
On Mon,
.
On Fri, Nov 19, 2021 at 10:47 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hello,
I tried to solve a 3D Poisson (ksp/tutorial/ex45) using -pc_type hypre on gpus
./ex45 -da_grid_x 128 -da_grid_y 128 -da_grid_z 128 -dm_mat_type hypre
-dm
Thank you very much that worked!
Best,
Karthik.
On 15/11/2021, 10:50, "Jose E. Roman" wrote:
-start_in_debugger -debug_terminal "/path/to/xterm -e"
> El 15 nov 2021, a las 11:06, Karthikeyan Chockalingam - STFC UKRI
escribió:
>
> Thank you f
nov 2021, a las 9:55, Karthikeyan Chockalingam - STFC UKRI
escribió:
>
> Hello,
>
> I am running PETSc 3.16.0 on a cluster compiled in debug mode using the
flag -start_in_debugger. But I getting following error message:
>
> Unable to start debugger i
Hello,
I am running PETSc 3.16.0 on a cluster compiled in debug mode using the flag
-start_in_debugger. But I getting following error message:
Unable to start debugger in xterm. No such file or directory.
I think the program is searching in the wrong path, probably under /usr/bin but
xterm is
Hello,
I used the flags -memory_view -malloc_log to ran a problem on the same size
on 32 cores and 64 cores.
I understand what is total, max and min memory usage of the problem is. However
I don’t understand the difference between Maximum and Current process memory?
I also curious to unders
2:24 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hello,
I hope, I am framing the question currently.
Are only distributed arrays (DMDA) of -vec_type and -mat_type only supported by
CUDA?
I don't understand this question. Currently, CUDA
Hello,
I hope, I am framing the question currently.
Are only distributed arrays (DMDA) of -vec_type and -mat_type only supported by
CUDA?
I am reading the petsc user manual in section 2.4 distributed arrays are
introduced but at the start of chapter two there are other vector and matrix
types
Dear all,
I would like to confirm if I have successfully build petsc with hypre gpu.
I have attached my build python script file.
Please let me know if I have it right?
Kind regards,
Karthik.
This email and any attachments are intended solely for the use of the named
recipients. If you are not
v"
Subject: Re: [petsc-users] hypre on gpus
Did you use -dm_mat_type hypre on the GPU case ?
On Fri, Oct 8, 2021 at 12:19 PM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
I tried a different exercise ran the same problem on two cpu core
: Friday, 8 October 2021 at 16:36
To: "Chockalingam, Karthikeyan (STFC,DL,HC)"
Cc: "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] hypre on gpus
On Fri, Oct 8, 2021 at 10:29 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
: Re: [petsc-users] hypre on gpus
Hypre does not record its flops with PETSc's timers.
Configure with and without CUDA and see if the timings change in PCApply.
Hypre does not dynamically switch between CUDA and CPU solves at this time, but
you want to use -dm_mat_type hypre.
Mark
On Fri, Oc
i, Oct 8, 2021 at 6:59 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hello,
I am trying to run ex45 (in KSP tutorial) using hypre on gpus. I have attached
the python configuration file and -log_view output from running the below
command option
Hello,
I am trying to run ex45 (in KSP tutorial) using hypre on gpus. I have attached
the python configuration file and -log_view output from running the below
command options
mpirun -n 2 ./ex45 -log_view -da_grid_x 169 -da_grid_y 169 -da_grid_z 169
-dm_mat_type mpiaijcusparse -dm_vec_type mp
Matthew Knepley , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] (percent time in this phase)
On Oct 5, 2021, at 12:28 PM, Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thanks Barry.
Please find the attached screen shoot (flame
ingam, Karthikeyan (STFC,DL,HC)"
Cc: Matthew Knepley , "petsc-users@mcs.anl.gov"
Subject: Re: [petsc-users] (percent time in this phase)
On Oct 5, 2021, at 12:28 PM, Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Thanks Barry.
ject: Re: [petsc-users] (percent time in this phase)
PCSetUpOnBlocks() calls KSPSetUp() on each block which calls PCSetUp() on
each block. This is why you are getting the confusing logging results. So the "
extra" KSPSetUp() is the one on the blocks.
On Oct 5, 2021,
t 3, 2021 at 5:43 AM Karthikeyan Chockalingam - STFC UKRI
mailto:karthikeyan.chockalin...@stfc.ac.uk>>
wrote:
Hi Matt,
Thank you. The flamegraph tool is helpful.
Please find the attached screen shoot and foo.txt which generated that graph
(using https://www.speedscope.app).
I find the following ca
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