Hi,
I'm running a Jmeter test that send some WMS requests to Geoserver to
investigate a performance issue we encounter while deploying our app. I can see
that the time to respond is really slowing down for more than 5 users.
Looking at the threads usage using JVisualVM, I've found that the number of
threads used by the ImageMosaicReader was not adjusted to reach the
maximumPoolSize.
I've done some tests by increasing the corePoolSize value to a higher value
and, in my case, the average time to process a WMS request is faster.
An average of 2852ms with corePoolSize=8 threads compare to 3885ms with
corePoolSixe=4 with 15 users doing 10 calls each.
We're running Geoserver 2.0.2 on a 2 Quad-Core server with 32GB RAM, so our
server can handle more threads.
Unfortunately, the corePoolSize and maximumPoolSize value are hard coded in the
ImageMosaicReader class and since the ThreadPoolExecutor is using a
LinkedBlockingQueue, the maximumPoolSize is not used. In other word, the number
of useful threads is 4:
public final class ImageMosaicReader extends AbstractGridCoverage2DReader
implements GridCoverageReader {
/** Logger. */
private final static Logger LOGGER =
org.geotools.util.logging.Logging.getLogger(ImageMosaicReader.class);
final static ExecutorService multiThreadedLoader= new
ThreadPoolExecutor(4,8,30,TimeUnit.SECONDS,new LinkedBlockingQueue<Runnable>());
Is there a particular reason to have those values hard coded?
Is there any chance that a future version includes a way to customize those
values either by the Geoserver UI or a properties file?
And in the mean time, is there another possible workaround other than
recompiling the gt-imagemosaic jar.
Thank you
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