VecGetArray() is defined to always look out of bounds - so if you use a compiler flag to check for out of bound error - you will always get this error. Alternative is to use VecGetArrayF90() - and to use this correctly - you should include petscvec.h90 Satish On Fri, 14 Jan 2011, Ormiston, Scott J. wrote:

We have been trying to use scatter to collect the entries of a PETSc solution vector into an ordinary sequential vector. We need this for our own post-processing and other calculations.

We were able to get ex15f.F to create and solve a matrix. Then we added code from ex30f.F and we were able to get it to work. When we put the code into our own mainline, it fails with the run-time error message:

0: Subscript out of range for array xx_v (main-petsc.f95: 1649) subscript=261373973, lower bound=1, upper bound=1, dimension=1 -------------------------------------------------------------------------- mpiexec has exited due to process rank 0 with PID 23105 on node mecfd01 exiting without calling "finalize". This may have caused other processes in the application to be terminated by signals sent by mpiexec (as reported here). --------------------------------------------------------------------------

Any ideas of what might be wrong? We believe the link libraries are the same between the two make files, and we just inserted the working example 15/30 code into our existing, working mainline.

For reference, an excerpt of the key code segments and the full relevent output are appended.

Scott Ormiston =========================CODE EXCERPT=============================== !... REAL*8 sol(NILU) !NILU is the length of the solution vector ! #include "finclude/petscsys.h" #include "finclude/petscvec.h" #include "finclude/petscmat.h" #include "finclude/petscpc.h" #include "finclude/petscksp.h" #include "finclude/petscis.h"

#define xx_a(ib) xx_v(xx_i + (ib)) PetscOffset xx_i PetscScalar xx_v(1)

#include "finclude/petscvec.h90" PetscScalar, pointer :: xp_v(:) Vec seqV VecScatter scat1 IS fromis, tois PetscInt from(12), to(12)

Vec Vx,Vb,Vu Mat A PC pc KSP ksp PetscScalar PSv,one,neg_one double precision norm,tol PetscErrorCode ierr PetscInt PETSCi,PETSCj,II,JJ,Istart PetscInt Iend,m,n,i1,its,five PetscMPIInt rank PetscTruth user_defined_pc,Pflg

external SampleShellPCSetUp, SampleShellPCApply, SampleShellPCDestroy

! Common block to store data for user-provided preconditioner common /myshellpc/ diag Vec diag ! call PetscInitialize(PETSC_NULL_CHARACTER,ierr)

! ex15f.F code ... ! call KSPSolve(ksp,Vb,Vx,ierr) ! !####################################################### !-- put the solution from parallel vector vx into sol(*) do i=1,m*n from(i)=i-1 to(i) =i-1 end do

call VecCreateSeq(PETSC_COMM_SELF,m*n,seqV,ierr) call VecSet(seqV,neg_one,ierr) if (rank.eq.0) then print *, "seqV OLD" call VecView(seqV,PETSC_VIEWER_STDOUT_SELF,ierr) end if

call ISCreateGeneral(PETSC_COMM_SELF,m*n,from,fromis,ierr) call ISCreateGeneral(PETSC_COMM_SELF,m*n,to,tois,ierr)

call VecScatterCreate(Vx,fromis,seqV,tois,scat1,ierr)

call ISDestroy(fromis,ierr) call ISDestroy(tois,ierr)

call VecScatterBegin(scat1,Vx,seqV,INSERT_VALUES,SCATTER_FORWARD,ierr) call VecScatterEnd(scat1,Vx,seqV,INSERT_VALUES,SCATTER_FORWARD,ierr)

if (rank.eq.0) then print *, "seqV NEW" call VecView(seqV,PETSC_VIEWER_STDOUT_SELF,ierr) ! !------*.F version of VecGetArray call VecGetArray(seqV,xx_v,xx_i,ierr) write(6,*) 'after VecGetArray' write(6,*) 'n=',n, ' m=',m do PETSCi=1,m*n xx_a(PETSCi) = 100.0*PETSCi sol(i) = xx_a(i) + 1.55 sol(i) = xx_v( xx_i + (i)) end do call VecRestoreArray(seqV,xx_v,xx_i,ierr) ! !------*.f95 version of VecGetArray call VecGetArrayF90(seqV,xp_v,ierr) print*,ierr do i=1,m*n sol(i)= xp_v(i) - 5.0 xp_v(i) = 100.0*i end do call VecRestoreArrayF90(seqV,xp_v,ierr) print*,'the f95 version of test solution vector is:' do i=1,m*n print*,sol(i) end do end if !... ! Free work space. All PETSc objects should be destroyed when they ! are no longer needed.

call KSPDestroy(ksp,ierr) call VecDestroy(Vu,ierr) call VecDestroy(Vx,ierr) call VecDestroy(Vb,ierr) call MatDestroy(A,ierr)

! Always call PetscFinalize() before exiting a program. ! call PetscFinalize(ierr)

=========================OUTPUT===================================== KSP Object: type: gmres GMRES: restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement GMRES: happy breakdown tolerance 1e-30 maximum iterations=10000, initial guess is zero tolerances: relative=1e-07, absolute=1e-50, divergence=10000 left preconditioning using PRECONDITIONED norm type for convergence test PC Object: type: jacobi linear system matrix = precond matrix: Matrix Object: type=seqaij, rows=12, cols=12 total: nonzeros=46, allocated nonzeros=60 not using I-node routines seqV OLD -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 seqV NEW 1 1 1 1 1 1 1 1 1 1 1 1 after VecGetArray n= 4 m= 3 0: Subscript out of range for array xx_v (main-petsc.f95: 1649) subscript=261373973, lower bound=1, upper bound=1, dimension=1 -------------------------------------------------------------------------- mpiexec has exited due to process rank 0 with PID 23105 on node mecfd01 exiting without calling "finalize". This may have caused other processes in the application to be terminated by signals sent by mpiexec (as reported here). --------------------------------------------------------------------------