Hi Rini,
that log is actually from GeoWebCache, so a proper performance comparison
should be done
by hitting a non yet populated tile cache and force GWC to popupate it...
like a seeding operation
for example.
That said, the JAI "crop" operation is actually doing nothing, it's just
making the image look smaller
to the callers by changing its origin, width and height (thus metadata),
so I don't see how a native extension can make any difference. From the
javadoc of CropOpImage:
* <p> Tiles that are completely inside or intersect the cropped region
* (this image's bounds) are simply forwarded from the source. Do NOT
* create a child raster even if a tile is not contained in this image's
* bounds. Tiles that are outside the croppped region result in a
* <code>null</code> return.
My guess is that the comment actually relates to an issue in the Java JPEG
encoder that fails
to encode properly shifted images (ones with origin not 0,0). However this
should have been
fixed in the meantime.
Simone, do you remember any better?
To see if the code still has any merit, one should try to remove the
BufferedImage extraction code here
and see if that actually makes any difference:
https://github.com/GeoWebCache/geowebcache/blob/master/geowebcache/core/src/main/java/org/geowebcache/layer/MetaTile.java#L319
It is also to be noted that GeoServer is using its own metatile subclass,
with entirely different code, it would be nice to just push back
the override, but I'm not 100% sure it's possible (due to dependencies that
might be available in GeoServer, but not in GeoWebCache):
https://github.com/geoserver/geoserver/blob/master/src/gwc/src/main/java/org/geoserver/gwc/layer/GeoServerMetaTile.java#L162
But yeah, in the context of GeoServer that warning is just noise, since the
code depending on that variable is not even executed.
Cheers
Andrea
On Wed, Oct 12, 2016 at 8:07 AM, <rini.angre...@csiro.au> wrote:
> Hi list,
>
>
>
> We notice a warning about Native JAI not being installed in the log files.
> I did a simple WMS GetMap performance comparison with and without native
> JAI, and they seem to be pretty much the same. Does anyone know if/how
> native JAI affect performance?
>
>
>
> WARN [layer.MetaTile] - ********* Native JAI is not installed, meta tile
> cropping may be slow ********
>
>
>
> Thanks
>
> Rini
>
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