GEOS-Chem performance

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Revision as of 14:51, 15 April 2010 by Bmy (Talk | contribs) (New page: == Adding additional tracers == '''''[mailto:ccarouge@seas.harvard.edu Claire Carouge] wrote:''''' :I ran an ensemble of 5 identical runs for 43 and 54 tracers with [[GEOS-Chem v8-02-04]...)

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Adding additional tracers

Claire Carouge wrote:

I ran an ensemble of 5 identical runs for 43 and 54 tracers with GEOS-Chem v8-02-04. For each set of tracers, I've run with everything turned on and then again with the chemistry turned off.
Here are the times (simulation length: 4 days):
# of tracers Avg total time (s) Avg chemistry time (s) Avg transport time (s)
54 (SOA chemistry) 760.27 457.93 302.34
43 (no SOA chemistry) 709.92 427.55 282.37
Diff 54-43 tracers +50.35 +30.38 +19.97
So it gives an increase of 7% for transport, chemistry and total time when adding 11 tracers. The additional time for transport is then not linear, but a linear estimate (1% additional time per additional tracer) can give a high estimate of the additional time.
The additional time in chemistry is very dependent on the type of tracer you add (aerosol, gas tracer with modifications to globchem.dat....) so the 7% increase in time is probably very particular to the SOA tracers.

--Bob Y. 10:51, 15 April 2010 (EDT)

Intel Fortran Compiler

Please see the following links for some timing comparisons between the various versions of the Intel Fortran Compiler (aka "IFORT" compiler):

--Bob Y. 10:51, 15 April 2010 (EDT)