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Known Issues:
- On HP Integrity Itanium® servers, if the Aries option is set to -pa_os_cpu
globally, HP-UX Java incorrectly runs PA binaries instead of IA
binaries. This happens silently without any messages. The
performance degrades by 2-3 times. The problem is fixed for JDK
releases beginning with 5.0.14, but it is seen across previously
released JDKs.
- fileChannel.map is implemented using mmap on the underlying operating system. On HP Integrity Itanium® servers running HP-UX 11i, multiple mmap calls of overlapping regions of a single file with the MAP_SHARED flag specified in the mmap call, would result in an error. (See the mmap manpages for more details.)
To workaround this problem, -Xmpas:on can be used. For an mpas process, each call to mmap is independent of other mappings made by the same process.
java -d32 -Xmpas:on <java class>
java -d64 -Xmpas:on <java class>
This causes the mpas-enabled Java executable java_q4p to be run, which exists for both 32 and 64 bit. Using -Xmpas:on might have a slight negative performance impact.
-Xmpas is available on Java 5.0.00 (or later) and Java 1.4.2.06 (or later).
JDK, JRE, and Plug-In 5.0.x Release Notes:
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Java™ and all Java based trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries.
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