[petsc-users] eps_target malloc issue

[Barry Smith]

  We need the entire error message. A matrix is being formed that wasn’t fully preallocated for so you need to determine which matrix and make sure either 1) it gets fully preallocated or 2) MatSetOption(mat, MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE) is called on the matrix

  Barry

On Jul 26, 2014, at 10:34 AM, jifeng zhao <jifengzhao2015 at u.northwestern.edu> wrote:

> Hello all,
> 
> I am trying to use ex7 to solve series of generalized problem. The running commands are:
> 
> ./ex7 -f1 petsc_stiff19.dat -f2 petsc_mass19.dat -mat_type sbaij -eps_gen_hermitian -eps_type krylovschur -eps_smallest_magnitude. -eps_monitor_conv -st_k    sp_type bcgs -st_pc_type bjacobi -st_sub_pc_type icc -st_ksp_rtol 1.e-4 -eps_tol 1.e-4 -eps_nev 40 -st_type sinvert
> 
> It works fine, but when my problem contains zero eigenvalue, it fails to converge.
> 
> Supposedly, I should use eps_target -0.1 instead of eps_smallest_magnitude. However if eps_target is used, I run into a memory issue:
> 
> PETSC ERROR: --------------------- Error Message ------------------------------------
> PETSC ERROR: Argument out of range!
> PETSC ERROR: New nonzero at (0,6) caused a malloc!
> PETSC ERROR: ------------------------------------------------------------------------
> 
> Does anybody know how to solve this? Thanks! 
> 
> Jifeng Zhao
> PhD candidate at Northwestern University, US
> Theoretical and Applied Mechanics Program