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

Stephen Woodbridge woodbri at swoodbridge.com
Tue Dec 18 06:24:35 PST 2012


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-
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>



More information about the gdal-dev mailing list