I am seeing a processing rate of about 8000 interpolated output points per hour.

Running r.surf.idw2 with 4 as number of reference points, much less than the default of 12.
However, if this makes any difference, the interpolation ratio is high, about 12.5/1.

The data being interpolated is USGS 1:24-25000 DEM data.
 
The system is running GRASS 5.0 b10 compiled on Redhat 6.2, on a AMD K6-2 400.

I didn't think the math for this function was very complex, 
being a type of weighted average, as I understand it, without any iterative components.

Am I wrong?

Is this performance normal?

I need to know because I intend to process over 100 files of this type, each with about 24,000,000 output points.
At this rate the task will take over three *years* on this system. 
It would take ~12 days to process a single file just to determine if the function is working correctly.

-TIA

-- 
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Carl Brown cbsled@ncia.net
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Microsoft: The company that made eMail dangerous.


