performance

[Brent A McDaniel <gte328r@xxxxxxxxxxxxxxxxxxxxx>]

Ferret Users,

I'm wondering if there's a way to increase performance on the current
calculation that I'm doing.  I opened up the ncep daily data files from
1957-1999 and am calculating the climatology for them.  Here's my
procedure for that:

yes? set memory/size=100
 Cached data cleared from memory
yes? set data "/usr/local/ferret/extra/air.des"
yes? DEFINE
AXIS/T=0:365.2425/EDGES/NPOINTS=365/T0=1-JAN-0001/UNITS=DAYS/MODULO tdaily
yes? let dailyclim=air[GT=tdaily@mod]
yes? REPEAT/l=1:365 save/file="/data/ncep/dailyclim.nc"/append dailyclim

I started this friday afternoon and currently at noon on sunday it's
working on it's 9th day (l=9).  If linear interpolation works for how long
it'll take, I'm looking at ~10 days to finish the year.  This seems like
an awfully long time as I've run averaging calculations (not using
ferret) on the same data with the same machine that took around 6 hours if
memory serves correctly.
If this helps, p3 800mhz running linux with 512megs of ram.  Basically
ferret and X are the only things currently running on the machine.

Thanks in advance,

Brent


-- 
Brent A. McDaniel

Dept of Earth and Atmospheric Sciences
Georgia Institute of Technology
Atlanta, Ga.  USA