NonStop Server for Java Programmer's Reference (NSJ 4.0+)

Table Of Contents

collection technique does not perform well as the default collector when the phases of the collection cannot

run concurrently with the application thread. This garbage collector, therefore, is disabled in NonStop Server

for Java 4.

The following java command options that specify a concurrent low-pause collector are not valid for

NonStop Server for Java 4:

-XX:+UseConcMarkSweepGC

Specifies using the concurrent mark-sweep garbage collector. If you specify this option,

the Java VM exits with the error: -XX:+UseConcMarkSweepGC option is not

supported on this platform.

-Xconcgc

Enables a concurrent mark-sweep garbage collector. This option is disabled. If you

specify this option, the Java VM exits with the error: -Xconcgc option is not supported

on this platform.

Incremental Low-Pause Collector

By careful bookkeeping, the incremental (also called train) low-pause collector collects just a portion of the

tenured generation at each minor collection. The collector tries to spread the large pause of a major collection

over many minor collections. In overall throughput, this collector is slower than the default tenured

generation collector.

To use the incremental low-pause collector, specify the following java command option:

-Xincgc

Specifies using the incremental low-pause garbage collector.

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NonStop Server for Java Programmer's Reference (526238-001)