> > Has anybody timed NetCDF v2.x compared to NetCDF v3.x? For both
> > read & write. Is the difference large enough to justify
> > recompiling?
>
> On what platform? We haven't done actual timings on them, but Sun
> and SGI times don't seem to have changed for us (and were small to
> begin with). Cray vector times, however, are _way_ down -- by better
> than a factor of 10.
Our most recent tests of 2.4.2 vs 3.3 on our Cray T90 show a reduction
in CP time of about 40% for writes and 20% for reads. More important,
perhaps, is the "fix" for the pre-fill option, which used to consume
more than 100x the CP time of the actual data write.
I am not sure why Carlie is getting a factor of 10 speedup on his Cray.
Optimization differences?
John P. Sheldon
(jps@xxxxxxxx)
Geophysical Fluid Dynamics Laboratory/NOAA
Princeton University/Forrestal Campus/Rte. 1
P.O. Box 308
Princeton, NJ, USA 08542
(609) 987-5053 office
(609) 987-5063 fax
