[gradsusr] Grads computation speed

[Michael Fiorino]

Jonas, you need to tell us the version of grads...  so the old data is
binary and the new data grib? ciao mike

On 5/21/10 11:42 AM, Jonas Kaufmann wrote:
> Hello,
>
> I just ran into a problem regarding Grads computation speed. I have
> set up a WRF model over Europe and extract surface parameters for
> about 4-5000 points in the model for 72 timesteps. Now I tried another
> WRF version which produces different output files, and the computation
> speed for my Grads tasks for the new model is much much slower than
> before. You can find the first lines of my control files below.
>
> Using my old model, I could run my complete Grads tasks in about 90
> minutes. Using the new setup, this takes forever to complete (had to
> skip this as it took too long, think it should be around 180 minutes
> or so), of course on the same machine. The main difference must be in
> the Gribfiles I am using.
>
> Can anyone explain why this might be happening? Which Gribfile
> settings (version, projection etc.) are the best usable ones for
> Grads? And finally: how can I improve computation speed for my new
> model?
>
> Thank you for your answer!
>
> Best regards,
> Jonas Kaufmann
>
>
> Old model:
> options  byteswapped
> pdef  161 146 lcc  47.300    9.800   81.000   73.500  47.30000
> 47.30000    9.80000  21000.000  21000.000
> xdef  626 linear  -19.84533   0.09459461
> ydef  324 linear   31.13766   0.09459461
> zdef   27 linear 1 1
> tdef   88 linear 21Z26MAY2009      60MN
> VARS   14
>
> New model:
> dtype grib 255
> pdef 265 211 lccr 31.202000 -10.532000 1 1 47.515000 47.515000
> 10.025000 14684 14768
> xdef 265 linear -10.532000 0.156066529170106
> ydef 211 linear 31.202000 0.134254545454545
> tdef 1 linear 00Z24may2010 1mo
> zdef 1 linear 1 1
> vars 16
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