[petsc-users] question

[Justin Chang]

Sorry forgot to hit reply all

On Monday, October 24, 2016, Justin Chang <jychang48 at gmail.com> wrote:

> It depends on your SNES solver. A SNES iteration could involve more than
> one function evaluation (e.g., line searching). Also, -snes_monitor may say
> 3 iterations whereas -snes_view might indicate 4 function evaluations which
> could suggest that the first call was for computing the initial residual.
>
> On Mon, Oct 24, 2016 at 2:22 PM, Gideon Simpson <gideon.simpson at gmail.com
> <javascript:_e(%7B%7D,'cvml','gideon.simpson at gmail.com');>> wrote:
>
>> I notice that if I use -snes_view,
>>
>> I see lines like:
>>   total number of linear solver iterations=20
>>   total number of function evaluations=5
>> Just to clarify, the number of "function evaluations" corresponds to the
>> number of Newton (or Newton like) steps, and the total "number of linear
>> solver iterations” is the total number of iterations needed to solve the
>> linear problem at each Newton iteration.  Is that correct?  So in the
>> above, there are 5 steps of Newton and a total of 20 iterations of the
>> linear solver across all 5 Newton steps.
>>
>> -gideon
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20161024/e71e8a77/attachment.html>