[petsc-dev] default SNES rtol for single precision builds

[Lisandro Dalcin]

On 19 September 2011 14:58, Matthew Knepley <knepley at gmail.com> wrote:
> On Mon, Sep 19, 2011 at 12:27 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
>>
>> After debugging a failing petsc4py testcase using single precision
>> builds, I realized the default SNES relative tolerance is 1e-8. What
>> should we do?
>
> In single, you can reach 1e-8, you just take more iterates since it looks
> like
> iterative refinement. I say we leave the tolerance where it is and make our
> tests smarter.
>    Matt
>

Well, this is a stupid testcase solving du/dt + u*u = 0 with TS. SNES
failed at line search.


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Lisandro Dalcin
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