[gdal-dev] Q: on gdalwarp of ecw file

[Stephen Woodbridge]

Here are some performance numbers in a presentation by Frank:
http://www.fosslc.org/drupal/content/tuning-gdal-raster-performance

I found this very informative.

-Steve W

On 12/18/2012 7:27 AM, Jan Hartmann wrote:
> Thanks Jukka, I always wanted to learn Finnish :-). Almost as difficult
> as Dutch.
>
> Cheers,
>
> Jan
>
> On 12/18/2012 01:16 PM, Jukka Rahkonen wrote:
>> Here is a fresh table comparing resampling methods and cgi vs. fast-cgi with
>> Mapserver and with raster map data.
>> http://latuviitta.org/Apps4Finland-2012/documents/Taustakartta_WMS_kapasiteetti.html
>>
>> Titles are in Finnish but you can make it with this lexicon
>> näytteitä=samples
>> vasteaika=response time
>> keskiarvo=mean
>> kuvaa/sek=images per second (800x600 pixels)
>>
>> Thus you can get either 17.3 images per second or 63.7 from the same source data
>> just be changing Mapserver/GDAL options. Naturally the quality is not the same
>> which is another prove for considering the whole system instead of optimizing a
>> single piece of it.  By the way, numbers show that "cgi slow-fast-cgi fast" is
>> not the whole truth either. If there is lot of computing with bilinear or
>> average resampling the difference in speed is nominal and cgi is much more
>> stable - look at then maximum response time field.
>>
>> -Jukka-
>>
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>
>
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