[Users] highest output frequency for CarpetIOBasic?

[Erik Schnetter]

Bernard

In Carpet, you specify how time iterations are counted via the
"max_refinement_levels". Whether these finest iterations exist depends
on how many levels you allocate. This ensures that each iteration
corresponds to the same dt.

The fact that your iteration step size is 2 doesn't matter. If you
want, you can reduce max_refinement_levels by one to change how
iterations are counted; the physics results should remain identical.

-erik

On Thu, Dec 1, 2011 at 11:00 AM, Kelly, Bernard J.
(GSFC-660.0)[UNIVERSITY OF MARYLAND BALTIMORE COUNTY]
<bernard.j.kelly at nasa.gov> wrote:
> Hi all.
>
> Something new (I think) and trivial, but is annoying me.
>
> For diagnostic purposes, I was running a Cactus/Carpet executable (ETK
> Maxwell) with CarpetIOBasic::output_1Devery = 1. To my surprise, the output
> happens every *two* timesteps. When I switch the parameter to 2, the same
> thing happens. So I get the following behaviour:
>
> parameter value  => actual output frequency
> -------------------------------------------------------------
> 1 => 2
> 2 => 2
> 4 => 4
> 8 => 8
>
> The grid has multiple refinement levels. I tried a smaller testsuite
> (perhaps one of the ML_BSSN tests, which are unigrid), and there
> "output_1Devery = 1" really did produce output every timestep.
>
> I know a proper report needs a sample parameter file for reproducibility,
> but before I get that (not logged into the right machine right now), perhaps
> someone could tell me why this -might- happen? The logic in the IOBasic
> thorn seems simple enough ...
>
> Thanks, Bernard
>
> -----------------------------------------------------------------------------
> Bernard Kelly -- CRESST Research Associate, NASA/GSFC
>
> Phone: +1 (301) 286-7243
> E-Mail: bernard.j.kelly at nasa.gov
> Web: http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&iphonebookid=13052
> -----------------------------------------------------------------------------
>
>
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/