EXTREME slowdown

[Arlindo da Silva]

On Feb 16, 2008 8:51 AM, Stefan Gofferje <gradsusers at gofferje.homelinux.org>
wrote:

> Hi folks,
>
> I want to draw some temperature & windchill graph with gradsdods. The
> whole thing runs on an Athlon XP2000+ as a test machine.
> For testing, I sdfopen the file by hand and after loading,


Which "file"? Is this by any chance a internally compressed HDF-4 or GRIB-2?
Some formats implement compression on a layer by layer basis. So, even if
you need a single horizontal point you have to read the whole xy slice,
decompress it, and then take your single point. So, these compression
techniques are not optimized for single point access.

--
Arlindo da Silva
dasilva at alum.mit.edu
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