Hi List,
Doing some performance testing (WMS GetMap) on a GeoServer (2.7.2) with
PostGreSQL (9.5.2) using JMeter, we're getting some odd slowdowns. It seems
that for a short while (up to a few minutes) GeoServer massively slows down in
responding to requests; the "max" times shoot up from a few seconds to about
60-70 seconds! We've had this across several environments with PostGres, but
the same tests on Oracle have never exhibited this.
The issue isn't on the PostGres end - the slowest query there during the
tests takes about 4 seconds, there's no queuing and the resource usage on its
(separate to GeoServer) box is negligible.
If I make the same request to GeoServer directly when not part of this
testing, it only takes a second or two, so there's nothing obviously wrong with
the requests either. The problem is also proving difficult to replicate
reliably.
The connections to PG are via Tomcat using a JNDI pool.
Has anyone encountered this sort of behaviour before or have any inkling as
to the cause?
Thanks,
Jonathan
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