Ruchir Choudhry [
http://community.jboss.org/people/ruchirc] replied to the discussion
"Memory consumption 1h after JBoss start"
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Apprecite your suggestions,
It all depends how you want to do it, JVM parameters gives a lot of flexibility to you and
there is no one size fits all.
Moreover my intent was to help the team get some idea, and not to cut copy the exact
thought, Diffrent app requires different type of setup.
We ran series of test "Load, noise, bursting, endurace" with multiple
appications on single Jboss EAP4.3 with different veriosn of JDK. Results came best with
the setup we have explained.
We used -XX:MaxTenuringThreshold=0 because it
promotes all objects allocated by the application in the young generation, which survive
a single GC cycle, directly to the old generation without copying them around between
the survivor spaces in the young generation. This setting, when used with CMS collector
in the old generation helps in two ways.
* The young generation GC does not have to waste its time copying the 10-20% long lived
objects multiple times between the survivor spaces, only to finally promote them to the
old generation.
* Additionally, most of the collection and cleaning work of these objects can be done
"concurrently" in the old generation. This behavior leads to additional
reduction in GC sequential overhead.
http://java.sun.com/developer/technicalArticles/Programming/turbo/
http://java.sun.com/developer/technicalArticles/Programming/turbo/
This setup was also good based on our test scenarios.
I guess you are bringing some good points, we will use this in next series of test.Keep
giving new Ideas :)
Respectfully,
Ruchir Choudhry
;)
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