SDK/RTE 1.4.2.09 for Debian Linux on Intel Itanium Processors Release Notes

[%T %B->%A(%C), %D]

• %T is "GC:" when the garbage collection is a scavenge, and "Full GC:" when it's a

full garbage collection. A scavenge collects live objects from the New Generation

only, whereas a full garbage collection collects objects from all spaces in the Java

heap.

• %B is the size of Java heap used before garbage collection, in KB.

• %A is the size after garbage collection, in KB.

• %C is the current capacity of the entire Java heap, in KB.

• %D is the duration of the collection in seconds.

-X

Prints out a brief usage message describing the non-standard options.

-Xbatch

Disables background compilation. If compilation of a large method is taking a long

time, the performance engine will revert to interpreting the method. It will compile

the method as a background task, running the method in interpreter mode until the

background compilation is finished. The -Xbatch flag disables background compilation

so that compilation of all methods proceeds as a foreground task until completed,

regardless of how long the compilation takes. This flag is provided for users who desire

more deterministic behavior of method compilation for purposes such as benchmarking.

-Xbootclasspath:<bootclasspath>

Specifies a colon-separated list of directories, JAR archives, and ZIP archives to search

for boot class files. The specified boot class libraries will be used instead of the boot

class files in the jre/lib/rt.jar archive normally used by the Java 2 software.

-Xprof

Profiles the running program, and sends profiling data to standard output. This option

is provided as a utility that is useful in program development and is not intended to

be be used in production systems.

-XheapInitialSizes

Displys the default value for the Java Heap.

-Xoptgc

The optimistic garbage collection flag. Improves garbage collection performance of

applications with mostly short-lived objects. A server-side application that creates

many short-lived objects for each transaction is likely to benefit greatly with -Xoptgc.

However this flag should be used with caution. It is not recommended for applications

that build up objects quickly during the run time that are not short-lived.