[petsc-users] Question about NASM initialization

[Takahashi, Tadanaga]

I am following up from the last inquiry. I read the source code nasm.c
<https://petsc.org/release/src/snes/impls/nasm/nasm.c.html> and it looks
like sub-snes iteration is being initialized with a scatter call from the
previous solution. In other words, if I use Newton's method for the local
solver, then in each NASM iteration the Newton's method uses the previous
local solution as the initial guess. Can anyone confirm this?

On Sun, Apr 2, 2023 at 6:14 PM Takahashi, Tadanaga <tt73 at njit.edu> wrote:

> Hello PETSc devs,
>
> I am using SNES NASM with Newton LS on the sub-SNES. I was wondering how
> the sub-SNES chooses the initial guess during each NASM iteration. Is it
> using the previously computed solution or is it restarting from zero?
>
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