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Dear petsc team, I implemented a matrix-free jacobian, and it can run sequentially. But running parallel I got the pc error like this (running with mpirun -np 2, only error from rank1 is presented here) [1]PETSC ERROR: ---------------------
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<meta charset="UTF-8"></head><body><pre style="font-family: sans-serif; font-size: 100%; white-space: pre-wrap; word-wrap: break-word">Dear petsc team,
I implemented a matrix-free jacobian, and it can run sequentially. But
running parallel I got the pc error like this (running with mpirun -np
2, only error from rank1 is presented here)
[1]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[1]PETSC ERROR: Nonconforming object sizes
[1]PETSC ERROR: Preconditioner number of local rows 81 does not equal
input vector size 162
[1]PETSC ERROR: See <a href="https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ahmistzr4wD3TJ0OvI0JWxB9aVSIbP78Jcs2X_6KMb4LdoR8drLB_DkHvaguhrca22RgFer0PlyUrtdfCA$">https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!ahmistzr4wD3TJ0OvI0JWxB9aVSIbP78Jcs2X_6KMb4LdoR8drLB_DkHvaguhrca22RgFer0PlyUrtdfCA$</a> for trouble shooting.
[1]PETSC ERROR: Petsc Release Version 3.17.3, Jun 29, 2022
[1]PETSC ERROR: /home/yi/workspace/DAMASK_yi/bin/DAMASK_grid on a
arch-linux-c-opt named carbon-x1 by yi Sun Mar 10 12:01:46 2024
[1]PETSC ERROR: Configure options --download-fftw --download-hdf5
--with-hdf5-fortran-bindings --download-fblaslapack --download-chaco
--download-hypre --download-metis --download-mumps --download-parmetis
--download-scalapack --download-suitesparse --download-superlu
--download-superlu_dist --download-triangle --download-zlib
--download-cmake --with-cxx-dialect=C++11 --with-c2html=0
--with-debugging=0 --with-ssl=0 --with-x=0 COPTFLAGS=-O3 CXXOPTFLAGS=-O3
FOPTFLAGS=-O3
[1]PETSC ERROR: #1 PCApply() at
/home/yi/App/petsc-3.17.3/src/ksp/pc/interface/precon.c:424
[1]PETSC ERROR: #2 KSP_PCApply() at
/home/yi/App/petsc-3.17.3/include/petsc/private/kspimpl.h:376
[1]PETSC ERROR: #3 KSPInitialResidual() at
/home/yi/App/petsc-3.17.3/src/ksp/ksp/interface/itres.c:64
[1]PETSC ERROR: #4 KSPSolve_GMRES() at
/home/yi/App/petsc-3.17.3/src/ksp/ksp/impls/gmres/gmres.c:242
[1]PETSC ERROR: #5 KSPSolve_Private() at
/home/yi/App/petsc-3.17.3/src/ksp/ksp/interface/itfunc.c:902
[1]PETSC ERROR: #6 KSPSolve() at
/home/yi/App/petsc-3.17.3/src/ksp/ksp/interface/itfunc.c:1078
[1]PETSC ERROR: #7 SNESSolve_NEWTONLS() at
/home/yi/App/petsc-3.17.3/src/snes/impls/ls/ls.c:222
[1]PETSC ERROR: #8 SNESSolve() at
/home/yi/App/petsc-3.17.3/src/snes/interface/snes.c:4756
[1]PETSC ERROR: #9 User provided function() at User file:0
However, from snes matrix-free documentation
(<a href="https://urldefense.us/v3/__https://petsc.org/release/manual/snes/*matrix-free-methods__;Iw!!G_uCfscf7eWS!ahmistzr4wD3TJ0OvI0JWxB9aVSIbP78Jcs2X_6KMb4LdoR8drLB_DkHvaguhrca22RgFer0Ply6ZbywOw$">https://urldefense.us/v3/__https://petsc.org/release/manual/snes/*matrix-free-methods__;Iw!!G_uCfscf7eWS!ahmistzr4wD3TJ0OvI0JWxB9aVSIbP78Jcs2X_6KMb4LdoR8drLB_DkHvaguhrca22RgFer0Ply6ZbywOw$</a>), it is said
matrix-free is used with pcnone. So I assume it would not apply
preconditioner, but it did use preconditioning probably the same as my
matrix-free shell matrix. Here is how i initialize my shell matrix and
the corresponding customized multiplication.
call MatCreateShell(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,&
int(9*product(cells(1:2))*cells3,pPETSCINT),&
int(9*product(cells(1:2))*cells3,pPETSCINT),&
F_PETSc,Jac_PETSc,err_PETSc)
call MatShellSetOperation(Jac_PETSc,MATOP_MULT,GK_op,err_PETSc)
call SNESSetDM(SNES_mech,DM_mech,err_PETSc)
call
SNESSetJacobian(SNES_mech,Jac_PETSc,Jac_PETSc,PETSC_NULL_FUNCTION,0,err_PETSc)
call SNESGetKSP(SNES_mech,ksp,err_PETSc)
call PCSetType(pc,PCNONE,err_PETSc)
And my GK_op is like
subroutine GK_op(Jac,dF_global,output_local,err_PETSc)
DM :: dm_local
Vec :: dF_global, dF_local, output_local
Mat :: Jac
PetscErrorCode :: err_PETSc
real(pREAL), pointer,dimension(:,:,:,:) :: dF_scal, output_scal
real(pREAL), dimension(3,3,cells(1),cells(2),cells3) :: &
dF
real(pREAL), dimension(3,3,cells(1),cells(2),cells3) :: &
output
call SNESGetDM(SNES_mech,dm_local,err_PETSc)
call DMGetLocalVector(dm_local,dF_local,err_PETSc)
call
DMGlobalToLocalBegin(dm_local,dF_global,INSERT_VALUES,dF_local,err_PETSc)
call
DMGlobalToLocalEnd(dm_local,dF_global,INSERT_VALUES,dF_local,err_PETSc)
call DMDAVecGetArrayReadF90(dm_local,dF_local,dF_scal,err_PETSc)
dF = reshape(dF_scal, [3,3,cells(1),cells(2),cells3])
.......
call DMDAVecRestoreArrayF90(dm_local,output_local,output_scal,err_PETSc)
CHKERRQ(err_PETSc)
call DMDAVecRestoreArrayF90(dm_local,dF_local,dF_scal,err_PETSc)
CHKERRQ(err_PETSc)
end subroutine GK_op
I checked my cells3, it corresponds to my local size, and it seems the
local size of dF_local is ok.
I am a bit lost here to find the reason for the preconditioner bug.
Could you help me on this? Thanks.
Best regards,
Yi
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