[Dart-users] Update to DART beta release

Nancy Collins nancy at ucar.edu
Mon Nov 11 09:14:47 MST 2013


hi all,

this morning i have updated the beta version of the Lanai release
to include the MPAS atmosphere, MPAS ocean, and the WRF models.

if you are interested in testing this code, please send a note to
dart at ucar dot edu and tell us you want the beta.  we will send you
the link to check out the code from our subversion repository.

if you have already checked out a version of the beta code you can
do an 'svn update' to get the latest version of the proposed release code.

if you are trying to reproduce results from the Kodiak version of DART
(or a previous development branch or trunk version), when you compare
your results to runs from code using the beta there are a few things
to keep in mind:

1) if you are using the intel compiler, make sure you add '-fp-model 
precise'
to your FFLAGS.  for intel chips which allow concurrent numerical 
computations,
they no longer guarantee that you'll get bitwise-identical results 
unless you
add this compile-time flag.  it has a slight performance penalty, so if 
you're
just doing a qualitative comparison you can leave it off.

2) for the WRF model_mod, if you are comparing results to a version compiled
with a model_mod checked out before 5 july 2012 (svn version 5773), you will
see minor bitwise differences with different processor counts because of 
a bug
(fixed on 5 july 2012) in the wrf get_close_obs() routine.

as always, if you have questions or feedback, please email dart at ucar 
dot edu.

thanks,
nancy





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