I see this parameter in all kinds of places (forums, etc.) and the common answer it help highly concurrent servers. Still, I cannot find an official documentation from sun explaining what it does. Also, was it added in Java 6 or did it exist in Java 5?

(BTW, a good place for many hotspot VM parameters is this page)

Update: Java 5 does not boot with this parameter.

java concurrency jvm jvm-arguments
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