HP-UX 11i Java™ JDK/JRE Version 7.0.09 Release Notes

conjunction with-XX:GCLogLimits, the GC log file would fail to rotate correctly in
accordance with the parameters provided to the -XX:GCLogLimits option. This was
a temporary issue and has been fixed in JDK/JRE 7.0.04.
G1 Garbage Collector and -Xverbosegc
Starting in JDK/JRE 7.0.04, the -Xverbosegc option supports the G1 garbage collector.
To produce Xverbosegc output for G1, use the options:
-XX:+UseG1GC -Xverbosegc
To see an explanation of the produced fields, use the command:
java -Xverbosegc:help.
The Xverbosegc output, containing G1 specific fields, can be viewed in HPjmeter 4.3
or later.
Change in loading of .hotspot_compiler and .hotspotrc files
Starting in JDK/JRE 7.0.02, the default implicit loading of the .hotspot_compiler
and .hotspotrc file from the current working directory has changed. These files are
no longer loaded by default. For existing deployments that rely on .hotspot_compiler
(for example, to exclude a method from hotspot compilation), and .hotspotrc, an
unsupported behavioral option is provided to simulate the old loading behavior. The
following command-line options support old behavior:
• -XX:Flags=.hotspotrc
reverts to old behavior for .hotspotrc.
• -XX:CompileCommandFile=.hotspot_compiler
reverts to old behavior for the .hotspot_compiler.
NOTE: The implicit loading of .hotspot_compiler from the directory where libjvm
resides remains unchanged.
Change in default for UseParallelOldGC option
Before JDK/JRE 7.0.02, the UseParallelOldGC option was off by default. Beginning
in JDK 7.0.02, UseParallelOldGC is automatically turned on when UseParallelGC
is on. And because UseParallelGC is on by default, UseParallelOldGC will also
be on.
UseParallelOldGC can improve the performance of applications where a large
percentage of GC time is spent doing Full GCs. For applications where very little time
is spent in Full GCs, there is negligable performance benefit.
UseParallelOldGC incurs a small increase in java process memory footprint.
To disable UseParallelOldGC, use the following option:
-XX:-UseParallelOldGC
Usage documentation 17