Questions on a few Java6 -XX options

[Michael Finocchiaro]

Hi everyone,
Just wondering why on the "official" list of -XX options here:
http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html
why -XX:+UseCompressedOops is not listed? I noticed a few bug reports...is
this option safe for production use?
Also, are there some performance numbers to +UseStringCache,
-XX:+UseCompressedStrings and/or -XX:+OptimizeStringConcat? Any white papers
I could study?
I thought that -Xmn was preferred over -XX:NewSize / -XX:MaxNewSize because
of the fact that -XX:NewRatio gets over-ridden by lots of other options
including -XX:SurvivorRatio and +UseConcMarkSweepGC...
Thanks in advance,
Fino

Michael Finocchiaro
michael.finocchiaro at gmail.com
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