[gradsusr] Grads computation speed

[Jonas Kaufmann]

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