[petsc-users] race conditions in VecSetValue(s)

[Matthew Knepley]

On Mon, Aug 1, 2011 at 9:15 PM, Dominik Szczerba <szczerba.dominik at gmail.com
> wrote:

> >> Is there a some sort of queue/lock
> >
> >   No
> >
> >> or will a race condition result?
> >
> >  No.
> >
> >> It's not discussed in the documentation.
> >
> >   Yes it is :-)
>
> I did not notice it in the VecSetValue(s) man pages...
>
> >   If ADD_VALUES is used then the location will always get the correct
> sum.
> >
> >   If INSERT_VALUES is used then one of the values set will be used but it
> is not defined which one.
>
> Many thanks for the clarifications. Would the same be the case with
> MatSetValues and a distributed matrix?
>

Yes.

   Matt


> Regards,
> Dominik
>
> >
> >   Barry
> >
> >>
> >> Thanks for any clarification,
> >> Dominik
> >
> >
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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