Questions on a few Java6 -XX options

[Alexander Livitz]

BTW, even -XX:+UseCompressedStrings is published as valid flag, the 1.6.0-21 JVM on Solaris SPARC 64bit fails to start with it. Anybody knows why? Is it a known bug?

Thanks,
Alexander

From: hotspot-gc-use-bounces at openjdk.java.net [mailto:hotspot-gc-use-bounces at openjdk.java.net] On Behalf Of Michael Finocchiaro
Sent: Monday, December 20, 2010 5:23 AM
To: hotspot-gc-use at openjdk.java.net
Subject: Questions on a few Java6 -XX options

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<mailto:michael.finocchiaro at gmail.com>
Mobile Telephone: +33 6 85 46 07 62
MSN: le_fino at hotmail.com<mailto:le_fino at hotmail.com>
Twitter: le_fino
Blog: http://mfinocchiaro.wordpress.com
Bookmarks: http://del.icio.us/michael.finocchiaro
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.openjdk.java.net/pipermail/hotspot-gc-use/attachments/20101220/41d7153e/attachment.html