The error message has [0]PETSC ERROR: New nonzero at (61,124) caused a malloc [0]PETSC ERROR: New nonzero at (124,186) caused a malloc You can check your code to see if you allocated spots for these nonzeros.
--Junchao Zhang On Tue, Apr 23, 2019 at 8:57 PM Maahi Talukder via petsc-users <[email protected]<mailto:[email protected]>> wrote: Dear All, I am trying to preallocate the no of nonzeros in my matrix using the parameter 'nnz'. Here 'row' is the parameter 'nnz'. The part of the code that does that is the following- .......................................................................................................................................................................................... Do j = 2,xmax-1 Do i = 2,ymax-1 a = (ymax-2)*(j-2)+i-1-1 If(j.eq.2 .and. i .ge. 3 .and. i .le. (ymax-2))then row(a) = 6 else if (j.eq.(xmax-1) .and. i.ge.3 .and. i .le. (ymax-2)) then row(a) = 6 else if(i.eq.2 .and. j.ge.3 .and. j.le.(xmax-2))then row(a) = 6 else if(i.eq.(ymax-1) .and. j.ge.3 .and. j.le.(xmax-2)) then row(a) = 6 else if(i.eq.2 .and. j.eq.2) then row(a) = 4 else if (i.eq.2 .and. j .eq. (xmax-1)) then row(a)= 4 else if (i.eq.(ymax-1) .and. j .eq. 2) then row(a) = 4 else if (i .eq. (ymax-1) .and. j .eq. (xmax-1)) then row(a) = 4 else row(a) = 9 end if end do end do call MatCreateSeqAIJ(PETSC_COMM_SELF,N,N,ze,row,Mp,ierr) ................................................................................................................................................................................................. But I get the following error message : [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [0]PETSC ERROR: Argument out of range [0]PETSC ERROR: New nonzero at (61,124) caused a malloc Use MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE) to turn off this check [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting. [0]PETSC ERROR: Petsc Release Version 3.10.2, unknown [0]PETSC ERROR: ./Test5 on a arch-opt named CB272PP-THINK1 by maahi Tue Apr 23 21:39:26 2019 [0]PETSC ERROR: Configure options --with-debugging=0 --download-fblaslapack=1 PETSC_ARCH=arch-opt [0]PETSC ERROR: #1 MatSetValues_SeqAIJ() line 481 in /home/maahi/petsc/src/mat/impls/aij/seq/aij.c [0]PETSC ERROR: #2 MatSetValues() line 1349 in /home/maahi/petsc/src/mat/interface/matrix.c [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [0]PETSC ERROR: Argument out of range [0]PETSC ERROR: New nonzero at (124,186) caused a malloc Use MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE) to turn off this check [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting. [0]PETSC ERROR: Petsc Release Version 3.10.2, unknown [0]PETSC ERROR: ./Test5 on a arch-opt named CB272PP-THINK1 by maahi Tue Apr 23 21:39:26 2019 [0]PETSC ERROR: Configure options --with-debugging=0 --download-fblaslapack=1 PETSC_ARCH=arch-opt [0]PETSC ERROR: #3 MatSetValues_SeqAIJ() line 481 in /home/maahi/petsc/src/mat/impls/aij/seq/aij.c [0]PETSC ERROR: #4 MatSetValues() line 1349 in /home/maahi/petsc/src/mat/interface/matrix.c [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- ................................................................................................................................................................................. But instead of using 'nnz', if I put a upper bound for 'nz', the code works fine. Any idea what went wrong? Thanks, Maahi Talukder
