GEOS-Chem performance

On this page we will post information about GEOS-Chem performance and timing results.

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, compiled with IFORT 11.1.069 with GEOS-5 and in 4x5 resolution. 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):

• IFORT 11 vs. IFORT 10
• IFORT 10 vs. IFORT 9

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

Timing results from 1-month benchmarks

Please see our GEOS-Chem supported platforms and compilers page for a user-submitted list of timing results from GEOS-Chem 1-month benchmark simulation. Several platform/compiler combinations are listed on this page.

--Bob Y. 10:57, 15 April 2010 (EDT)