[petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
Shatanawi, Sawsan Muhammad
sawsan.shatanawi at wsu.edu
Sat May 18 18:29:14 CDT 2024
Hello everyone,
Thank you all for your feedback, it helped me a lot.
I read the PETSc document and examples related to the Jacobian and modified my code.
Now I am getting errors related to the memory access. I tried to debug but couldn't find out how to fix it.
sshatanawi/SawSim: Sawsan's Simulation (SawSim) is a groundwater dynamics scheme to be integrated into Noah MP land surface model (github.com)<https://urldefense.us/v3/__https://github.com/sshatanawi/SawSim__;!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWC_nYtfgA$ > is the link to the code in the GitHub, I would appreciate it if you could have a look at it and guide me how to fix it.
I believe the problem is in the memory of LHS and res_vector because they are new vectors I created.
Thank you in advance for your help, I really appreciate it
Bests,
Sawsan
________________________________
From: Matthew Knepley <knepley at gmail.com>
Sent: Saturday, May 11, 2024 1:56 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu>
Cc: Barry Smith <bsmith at petsc.dev>; petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
On Fri, May 10, 2024 at 6:30 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Good afternoon, I have tried SNESComputeJacobianDefaultColor(), but the arguments needed are confusing me. Would you please have a look at my code and the error messages I am getting? I didn't understand what the nonzero values of the sparse
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Good afternoon,
I have tried SNESComputeJacobianDefaultColor(), but the arguments needed are confusing me.
Would you please have a look at my code and the error messages I am getting?
I didn't understand what the nonzero values of the sparse Jacobian would be.
1) You are not checking any of the return values from PETSc calls. Look at the PETSc Fortran examples.
You should wrap all PETSc calls in PetscCall() or PetscCallA().
2) You are not intended to directly call SNESComputeJacobianDefaultColor(). PETSc will do this automatically if you do not set of Jacobian function.
3) As Barry points out, coloring will not work unless we understand the nonzero structure of your Jacobian. This can happen by either:
a) Using a DM: This is the easiest. Find the type that matches your grid, or
b) Preallocating your Jacobian: Here you give the nonzero structure of your Jacobian, but not the values.
Currently you do not do this. Instead you just give the size, not the nonzero structure (columns for
each row).
Thanks,
Matt
Thank you for your patience and help
Bests,
Sawsan
________________________________
From: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>
Sent: Thursday, May 9, 2024 12:05 PM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
On May 9, 2024, at 2:52 PM, Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
This Message Is From an External Sender
This message came from outside your organization.
Hello everyone,
Thank you for your responses and feedback,
I checked PFLOTRAN and found that it is a model to simulate groundwater flow, contaminant transport, and other subsurface processes.
my goal is not to simulate the groundwater flow, my goal is to develop a code from scratch to simulate the groundwater flow with specific conditions, and then integrate this code with land surface models.
Later, the simulation of this code will be on a large scale.
I want PETSc to calculate the Jacobian because the system is large and has complex nonlinear behavior, and I don’t risk calculating the derivative by myself.
My A-Matrix has parts of source terms that depend on the flow fields, and independent parts will be in the RHS vector.
With coloring SNESComputeJacobianDefaultColor() PETSc can compute Jacobian's pretty efficiently. You do not to provide the residual function and you need to provide the nonzero pattern of the sparse Jacobian; that is what residual components f_i are coupled to what input variables in the array x_i. This information comes from your PDE and discretization and appears implicitly in your residual function.
Barry
I hope I have answered your questions, and I apologize that I wasn’t clear from the beginning, I was trying to keep my descriptions brief.
Bests,
Sawsan
________________________________
From: Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>
Sent: Tuesday, May 7, 2024 5:17 PM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
On Tue, May 7, 2024 at 2:23 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
This Message Is From an External Sender
This message came from outside your organization.
Hello everyone,
I hope this email finds you well.
My Name is Sawsan Shatanawi, and I was developing a Fortran code for simulating groundwater flow in a 3D system with nonlinear behavior. I solved the nonlinear system using the PCG solver and Picard iteration, but I did not get good results although I checked my matrix and RHS and everything, I decided to change my solver to Newton Rapson method.
I checked PETSc documents but I have a few questions:
1) My groundwater system is time-dependent, so should I use TS only instead of SNES?
You could use TS, but it is not necessary. You could use SNES and your own timestepping. THe advantage of TS is that you can try many different timesteppers without recoding (just like you can
try many different linear and nonlinear solvers).
2) My system has its deltaT, would using deltaT as dt affect my solver, or is it better to use TS-PETSc dt? Also, would using PETSc dt affect the simulation of the groundwater system
It sounds like your dt comes from your timestepper. If you use TS, you would use the dt from that.
3) I want my Jacobian matrix to be calculated by PETSc automatically
PETSc can calculate a full Jacobian for smaller problems, or a finite-difference Jacobian for any problem (but this impacts the solver). It should be straightfoward to code up the analytic Jacobian. Is there a reason it would be a problem?
4) Do I need to define and calculate the residual vector?
Yes.
My A-Matrix contains coefficients and external sources and my RHS vector includes the boundary conditions
It is strange that your matrix would contain source terms. Do they depend on the flow fields?
Barry is right, you should consider PFlotran, and at least know why it would not work for your problem if you don't use it.
Thanks,
Matt
Please find the attached file contains a draft of my code
Thank you in advance for your time and help.
Best regards,
Sawsan
________________________________
From: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Sent: Tuesday, January 16, 2024 10:43 AM
To: Junchao Zhang <junchao.zhang at gmail.com<mailto:junchao.zhang at gmail.com>>
Cc: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>; Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>; Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
Hello all,
Thank you for your valuable help. I will do your recommendations and hope it will run without any issues.
Bests,
Sawsan
________________________________
From: Junchao Zhang <junchao.zhang at gmail.com<mailto:junchao.zhang at gmail.com>>
Sent: Friday, January 12, 2024 8:46 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>; Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>; Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
Hi, Sawsan,
First in test_main.F90, you need to call VecGetArrayF90(temp_solution, H_vector, ierr) and VecRestoreArrayF90 (temp_solution, H_vector, ierr) as Barry mentioned.
Secondly, in the loop of test_main.F90, it calls GW_solver(). Within it, it calls PetscInitialize()/PetscFinalize(). But without MPI being initialized, PetscInitialize()/PetscFinalize() can only be called once.
do timestep =2 , NTSP
call GW_boundary_conditions(timestep-1)
!print *,HNEW(1,1,1)
call GW_elevation()
! print *, GWTOP(2,2,2)
call GW_conductance()
! print *, CC(2,2,2)
call GW_recharge()
! print *, B_Rech(5,4)
call GW_pumping(timestep-1)
! print *, B_pump(2,2,2)
call GW_SW(timestep-1)
print *,B_RIVER (2,2,2)
call GW_solver(timestep-1,N)
call GW_deallocate_loop()
end do
A solution is to delete PetscInitialize()/PetscFinalize() in GW_solver_try.F90 and move it to test_main.F90, outside the do loop.
diff --git a/test_main.F90 b/test_main.F90
index b5997c55..107bd3ee 100644
--- a/test_main.F90
+++ b/test_main.F90
@@ -1,5 +1,6 @@
program test_GW
+#include <petsc/finclude/petsc.h>
use petsc
use GW_constants
use GW_param_by_user
@@ -8,6 +9,9 @@ program test_GW
implicit none
integer :: N
integer :: timestep
+ PetscErrorCode ierr
+
+ call PetscInitialize(ierr)
call GW_domain(N)
!print *, "N=",N
!print *, DELTAT
@@ -37,4 +41,5 @@ program test_GW
end do
print *, HNEW(NCOL,3,2)
call GW_deallocate ()
+ call PetscFinalize(ierr)
end program test_GW
With that, the MPI error will be fixed. The code could run to gw_deallocate () before abort. There are other memory errors. You can install/use valgrind to fix them. Run it with valgrind ./GW.exe and look through the output
Thanks.
--Junchao Zhang
On Thu, Jan 11, 2024 at 10:49 PM Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>> wrote:
Hello,
Thank you all for your help.
I have changed VecGetArray to VecGetArrayF90, and the location of destory call. but I want to make sure that VecGet ArrayF90 is to make a new array( vector) that I can use in the rest of my Fortran code?
when I run it and debugged it, I got
5.2000000E-03
50.00000
10.00000
0.0000000E+00
PETSC: Attaching gdb to /weka/data/lab/richey/sawsan/GW_CODE/code2024/SS_GWM/./GW.exe of pid 33065 on display :0.0 on machine sn16
Unable to start debugger in xterm: No such file or directory
0.0000000E+00
Attempting to use an MPI routine after finalizing MPICH
srun: error: sn16: task 0: Exited with exit code 1
[sawsan.shatanawi at login-p2n02 SS_GWM]$ gdb ./GW/exe
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-100.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://urldefense.us/v3/__http://gnu.org/licenses/gpl.html__;!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWANrABHFg$ <https://urldefense.com/v3/__http://gnu.org/licenses/gpl.html__;!!JmPEgBY0HMszNaDT!o4qS1zaFLg2L8PlawWJVyYsJpnwYHuL6SIIZsmzTO98RCzbP26HwTi_0-ipCS_D2SBG0X4gtEnM13-nbzFEFKvtraKaM$>>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<https://urldefense.us/v3/__http://www.gnu.org/software/gdb/bugs/__;!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWC80DO_Ag$ <https://urldefense.com/v3/__http://www.gnu.org/software/gdb/bugs/__;!!JmPEgBY0HMszNaDT!o4qS1zaFLg2L8PlawWJVyYsJpnwYHuL6SIIZsmzTO98RCzbP26HwTi_0-ipCS_D2SBG0X4gtEnM13-nbzFEFKjO8jNfs$>>...
./GW/exe: No such file or directory.
(gdb) run
Starting program:
No executable file specified.
Use the "file" or "exec-file" command.
(gdb) bt
No stack.
(gdb)
If the highlighted line is the error, I don't know why when I write gdb , it does not show me the location of error
The code : sshatanawi/SS_GWM (github.com)<https://urldefense.com/v3/__https://github.com/sshatanawi/SS_GWM__;!!JmPEgBY0HMszNaDT!o4qS1zaFLg2L8PlawWJVyYsJpnwYHuL6SIIZsmzTO98RCzbP26HwTi_0-ipCS_D2SBG0X4gtEnM13-nbzFEFKp8i33ur$>
I really appreciate your helps
Sawsan
________________________________
From: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>
Sent: Wednesday, January 10, 2024 5:35 PM
To: Junchao Zhang <junchao.zhang at gmail.com<mailto:junchao.zhang at gmail.com>>
Cc: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>; Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
On Jan 10, 2024, at 6:49 PM, Junchao Zhang <junchao.zhang at gmail.com<mailto:junchao.zhang at gmail.com>> wrote:
Hi, Sawsan,
I could build your code and I also could gdb it.
$ gdb ./GW.exe
...
$ Thread 1 "GW.exe" received signal SIGSEGV, Segmentation fault.
0x00007ffff1e6d44f in vecgetarray_ (x=0x7fffffffa718, fa=0x0, ia=0x7fffffffa75c, ierr=0x0) at /scratch/jczhang/petsc/src/vec/vec/interface/ftn-custom/zvectorf.c:257
257 *ierr = VecGetArray(*x, &lx);
(gdb) bt
#0 0x00007ffff1e6d44f in vecgetarray_ (x=0x7fffffffa718, fa=0x0, ia=0x7fffffffa75c, ierr=0x0) at /scratch/jczhang/petsc/src/vec/vec/interface/ftn-custom/zvectorf.c:257
#1 0x000000000040b6e3 in gw_solver (t_s=1.40129846e-45, n=300) at GW_solver_try.F90:169
#2 0x000000000040c6a8 in test_gw () at test_main.F90:35
ierr=0x0 caused the segfault. See https://urldefense.us/v3/__https://petsc.org/release/manualpages/Vec/VecGetArray/*vecgetarray__;Iw!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWBtdqieFA$ <https://urldefense.com/v3/__https://petsc.org/release/manualpages/Vec/VecGetArray/*vecgetarray__;Iw!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZ9Km12jA$>, you should use VecGetArrayF90 instead.
BTW, Barry, the code https://urldefense.us/v3/__https://github.com/sshatanawi/SS_GWM/blob/main/GW_solver_try.F90*L169__;Iw!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWBYM08cBw$ <https://urldefense.com/v3/__https://github.com/sshatanawi/SS_GWM/blob/main/GW_solver_try.F90*L169__;Iw!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZh2eAi4o$> has "call VecGetArray(temp_solution, H_vector, ierr)". I don't find petsc Fortran examples doing VecGetArray. Do we still support it?
This is not the correct calling sequence for VecGetArray() from Fortran.
Regardless, definitely should not be writing any new code that uses VecGetArray() from Fortran. Should use VecGetArrayF90().
--Junchao Zhang
On Wed, Jan 10, 2024 at 2:38 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello all,
I hope you are doing well.
Generally, I use gdb <the name of my exe.file> to debug the code.
I got the attached error message.
I have tried to add the flag -start_in_debugger in the make file, but it didn't work, so it seems I was doing it in the wrong way
This is the link for the whole code: sshatanawi/SS_GWM (github.com)<https://urldefense.com/v3/__https://github.com/sshatanawi/SS_GWM__;!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZ1Veab3M$>
[https://urldefense.us/v3/__https://opengraph.githubassets.com/9eb6cd14baf12f04848ed209b6f502415eb531bdd7b3a5f9696af68663b870c0/sshatanawi/SS_GWM__;!!G_uCfscf7eWS!dytCOR2bN1sL_Mje4qGaOf_Aq9RPC4e0HSx7PRurwI9TU9luzRIcP2sPv9AwO7jvdbPOxwEnKa21nCxcVF28kGo5HWCf6xSywA$ ]<https://urldefense.com/v3/__https://github.com/sshatanawi/SS_GWM__;!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZ1Veab3M$>
GitHub - sshatanawi/SS_GWM<https://urldefense.com/v3/__https://github.com/sshatanawi/SS_GWM__;!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZ1Veab3M$>
Contribute to sshatanawi/SS_GWM development by creating an account on GitHub.
github.com<https://urldefense.com/v3/__http://github.com/__;!!JmPEgBY0HMszNaDT!tqBApprMfYxwNz4Zvnk8coNE5AeWjA9wSdAM7QJcIIVP1z0VDsVIalo4Sew2b0fW3bZtTAbPh-h0MUsZ8rcrPiA$>
You can read the description of the code in " Model Desprciption.pdf"
the compiling file is makefile_f90 where you can find the linked code files
I really appreciate your help
Bests,
Sawsan
________________________________
From: Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>
Sent: Friday, January 5, 2024 4:53 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
This is a segv. As Matt said, you need to use a debugger for this or add print statements to narrow down the place where this happens.
You will need to learn how to use debuggers to do your project so you might as well start now.
If you have a machine with a GUI debugger that is easier but command line debuggers are good to learn anyway.
I tend to run debuggers directly (eg, lldb ./a.out -- program-args ...) and use a GUI debugger (eg, Totalview or DDT) if available.
Mark
On Wed, Dec 20, 2023 at 10:02 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello Matthew,
Thank you for your help. I am sorry that I keep coming back with my error messages, but I reached a point that I don't know how to fix them, and I don't understand them easily.
The list of errors is getting shorter, now I am getting the attached error messages
Thank you again,
Sawsan
________________________________
From: Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>
Sent: Wednesday, December 20, 2023 6:54 PM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
On Wed, Dec 20, 2023 at 9:49 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello Barry,
Thank you a lot for your help, Now I am getting the attached error message.
Do not destroy the PC from KSPGetPC()
THanks,
Matt
Bests,
Sawsan
________________________________
From: Barry Smith <bsmith at petsc.dev<mailto:bsmith at petsc.dev>>
Sent: Wednesday, December 20, 2023 6:32 PM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>; petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
Instead of
call PCCreate(PETSC_COMM_WORLD, pc, ierr)
call PCSetType(pc, PCILU,ierr) ! Choose a preconditioner type (ILU)
call KSPSetPC(ksp, pc,ierr) ! Associate the preconditioner with the KSP solver
do
call KSPGetPC(ksp,pc,ierr)
call PCSetType(pc, PCILU,ierr)
Do not call KSPSetUp(). It will be taken care of automatically during the solve
On Dec 20, 2023, at 8:52 PM, Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello,
I don't think that I set preallocation values when I created the matrix, would you please have look at my code. It is just the petsc related part from my code.
I was able to fix some of the error messages. Now I have a new set of error messages related to the KSP solver (attached)
I appreciate your help
Sawsan
________________________________
From: Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>
Sent: Wednesday, December 20, 2023 6:44 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
Did you set preallocation values when you created the matrix?
Don't do that.
On Wed, Dec 20, 2023 at 9:36 AM Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>> wrote:
Hello,
I am trying to create a sparse matrix( which is as I believe a zero matrix) then adding some nonzero elements to it over a loop, then assembling it
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________________________________
From: Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>>
Sent: Wednesday, December 20, 2023 2:48 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi at wsu.edu<mailto:sawsan.shatanawi at wsu.edu>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
[EXTERNAL EMAIL]
I am guessing that you are creating a matrix, adding to it, finalizing it ("assembly"), and then adding to it again, which is fine, but you are adding new non-zeros to the sparsity pattern.
If this is what you want then you can tell the matrix to let you do that.
Otherwise you have a bug.
Mark
On Tue, Dec 19, 2023 at 9:50 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello everyone,
I hope this email finds you well.
My Name is Sawsan Shatanawi, and I am currently working on developing a Fortran code for simulating groundwater flow in a 3D system. The code involves solving a nonlinear system, and I have created the matrix to be solved using the PCG solver and Picard iteration. However, when I tried to assign it as a PETSc matrix I started getting a lot of error messages.
I am kindly asking if someone can help me, I would be happy to share my code with him/her.
Please find the attached file contains a list of errors I have gotten
Thank you in advance for your time and assistance.
Best regards,
Sawsan
<Matrix_RHS.F90><out.txt><solver.F90>
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--
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-- Norbert Wiener
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