[petsc-users] How rto use multigrid?

[Jed Brown]

Yes, it's faster to understand this error message than to have
"mysteriously slow performance".

** Preallocation routines now automatically set
MAT_NEW_NONZERO_ALLOCATION_ERR, if you intentionally preallocate less than
necessary then use
MatSetOption(mat,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE) to disable the
error generation.
*
http://www.mcs.anl.gov/petsc/documentation/changes/33.html

On Thu, Nov 1, 2012 at 8:57 AM, w_ang_temp <w_ang_temp at 163.com> wrote:

> Do you mean that the two versions have a different in this point? If I use
> the new version, I have to
> make some modifications on my codes?
>
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