[wrfems] A Slow Model Run

Cory Van Pelt cory.vanpelt at noaa.gov
Sun Sep 26 19:37:49 MDT 2010


Hi Jim,

I noticed you're using the RRTMG radiation schemes. Both of those are quite
computationally intensive, which is why I never use them. I use RRTM
longwave and Dudhia shortwave.

Cory



On Sun, Sep 26, 2010 at 5:29 PM, Jim Moser <Jim.Moser at noaa.gov> wrote:

> Ok...after a few more calculations...I've realized the grid is too big.
>
> Current model run has 145x150 gridpoints for a total of 21,750. This runs
> in 50 mins.
> Proposed new model has 395x403 gridpoints for a total of 158,790. Dividing
> 158,790
>  by 21,750 and multiplying by 50 mins I get a little over 6 hours.
>
> But...might there be other reasons that its taking so long.
>
> Jim
>
>
>
> Jim Moser wrote:
>
>> Well...I ran the ems_install.pl script about a month ago and it seemd to
>> go just fine.
>> So I have the 3.1 version of the wrf installed. I've worked on
>> configuration  files
>> for the last 2 days using the included guide(Thank You Bob!).
>>
>> Attempted our first run tonight just to see if it would fly. All seemed to
>> go fairly well.
>> After almost 2 hours of computation on our 16 cpu modelling box I checked
>> the output
>> using the tail command as suggested.
>>
>> After 1 hr and 51 mins of computation time it had completed 3 hrs (thats
>> right 3 hrs) of the model
>> run. The listing showed a basic timestep of 8.6 sec with every sixth
>> timestep taking 20-40 secs.
>> To begin with this is a fairly big ARW grid. It goes from CHI to MSY and
>> AVL to FSM. Resolution
>> is 3 km. Maybe I've bitten off more than I can chew here. At any rate I'm
>> attaching the run_info.txt
>> file for a more accurate description.
>>
>> If anyone has any ideas about where to start checking...please speak up!
>>
>> ------------------------------------------------------------------------
>>
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>>
>
>
> --
> -----------------------
> Jim Moser
> WFO Nashville
> Warngen Focal Point
> ----------------------
>
> "The urge to save humanity is almost always only a false-face for the urge
> to rule it."  H. L. Mencken
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