On Dec 23, 2011, at 8:36 PM, Dave Nystrom wrote:
> Mark F. Adams writes:
>> It sounds like you have a symmetric positive definite systems like du/dt -
>> div(alpha(x) grad)u. The du/dt term makes the systems easier to solve.
>> I'm guessing your hard system does not have this mass term and so is
Mark F. Adams writes:
> It sounds like you have a symmetric positive definite systems like du/dt -
> div(alpha(x) grad)u. The du/dt term makes the systems easier to solve.
> I'm guessing your hard system does not have this mass term and so is
> purely elliptic. Multigrid is well suited for th
k
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ISs, but
> the user shouldn't get a Mat back in their callback because they are being
> asked to perform a nonlinear operation that does not use a Mat.
>
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menters 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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dard
coloring G-S, so you can think of it in that way. If you did dumb coloring
then you would need to use this new primitive on each color, and you need a
graph to do the coloring.
Mark
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sed for non-symetric operators we could simplify the
algorithm a bit and get rid of this ...
Mark
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;
I think the number of colors is pretty much hopeless if you use a stable
Stokes element like Q2-P1disc.
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can build the ISs,
but the user shouldn't get a Mat back in their callback because they are
being asked to perform a nonlinear operation that does not use a Mat.
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their experiments
> is infinitely more interesting than any results to which their experiments
> lead.
> -- Norbert Wiener
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nted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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h code can we reuse
between the matrix-based implementation and the nonlinear implementation?
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se I've tried. Is there any hope of doing nonlinear G-S where the user
can provide something moderately simple?
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e 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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MIS and MOOSE wants parallel coloring, both of which involve moving
> integer data over the scatter context.
>
> What other implementations are currently non-scalable? Do we need other
> primitives, or would two-way integer operations over the MPIXAIJ scatter and
> via an IS be suf
On Thu, 22 Dec 2011, Dave Nystrom wrote:
> Jed Brown writes:
> > On Thu, Dec 22, 2011 at 22:18, Dave Nystrom
> wrote:
> >
> > > --with-gnu-compilers=0 --with-vendor-compilers=pgi
> >
> > --with-vendor-compilers=portland
> So, should I specify each of the compiler environment variables th
e like, here's something that perhaps we want to put in PETSc,
what rich communication pattern does it use, such that, if provided, the
implementation would be simple?
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On 22 December 2011 13:57, Matthew Knepley wrote:
> On Thu, Dec 22, 2011 at 10:32 AM, Lisandro Dalcin
> wrote:
>>
>> On 22 December 2011 12:19, Matthew Knepley wrote:
>> > On Thu, Dec 22, 2011 at 9:11 AM, Chekuri S. Choudary
>> > wrote:
>> >>
>> >>
>> >>
>> >> I am building an RPM for petsc-3.
ranted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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Do you mean
CC = /path/to/pgcc
p.s. I am almost certainly leaving my current position at the end of the year;
could my petsc-dev email address be changed to
tcortese at illinoisalumni.org
Thanks,
-Tom Cortese
From: petsc-dev-bounces at mcs.anl.gov [pets
t?
>
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agonstics, often takes significant effort to build
code) and don't offer much if anything in performance. In contrast, Intel
compilers usually don't require much effort to try.
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