Hi all,
I posted this issue on stackoverflow
<https://stackoverflow.com/questions/74114071/geoserver-bottleneck-when-writing-response-image>
but it was recommended to me to ask rather here:
I've come across a bottleneck that occurs when writing the final png file
from a WMS request. I'm rendering a geotiff (tiled, LZW compressed, with
external overviews, 90 MB file), reprojecting the layer from native CRS to
EPSG:4326. When requesting an image of the same size in native CRS, the
request takes around 100 ms, when reprojected, the request takes on average
around 7000 ms.
I had a look in logs with GEOSERVER_DEVELOPER_LOGGING options and both
requests (native/reprojected) are taking similar amount of time except when
writing the final png output image, where the request for reprojected image
gets stucked:
2022-10-18 14:12:02,059 DEBUG [org.geoserver.wms.map] - Writing png image
...
2022-10-18 14:12:09,139 DEBUG [org.geoserver.wms.map] - Writing png image
... done!
Using these log messages, I was able to look up following function in java:
public void formatImageOutputStream(
RenderedImage image, OutputStream outStream, WMSMapContent
mapContent)
As I'm not sure what this function does, could anyone advise me where to
look next? The server is a virtual machine with Windows Server running in
HyperV, multiple cores and plenty of memory allocated to java. The issue
seems to be affecting all layers, however same rasters and layers are
working fine in other Geoserver instances that I run on physical machines.
I understand this might not be a Geoserver issue but I would still love to
hear your suggestions on where I could investigate.
Thanks a lot.
Geoserver version: 2.20.2 Container: Tomcat 9.0 (jre1.8.0_321)
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