NonStop Server for Java 5.1 Tools Reference Pages

for Java 5.1application is run as a Pathway server, you can enable this option to alert Pathmon to restart the server

after the NonStop Server for Java 5.1 application dies.

-XX:GuaranteeFreeHeapSizeAfterGC=<number>

Prevents excessive garbage collection (GC) activity in Java applications that have not been tuned well with respect

to GC. If the application uses almost all of the memory heap and the Java virtual machine is unable to collect much

garbage, excessive GC activity might occur to satisfy the demand for allocation of new objects. This activity may

result in a busy CPU in which the Java application is executing. To prevent this occurrence, use the

-XX:GuaranteeFreeHeapSizeAfterGC=<number> option, where <number> is specified in bytes,

kilobytes (k), or megabytes (m). After a GC, if the Java virtual machine cannot free the heap size more than the

value specified with the GuaranteeFreeHeapSizeAfterGC option, the Java virtual machine throws an

OutOfMemoryError.

-XX:+ForceStopableMode

Forces the Java process stop mode to 1 (stoppable) when a Java thread transitions to native state.

Under certain rare conditions, the Java Virtual Machine (JVM) can incorrectly be running in unstoppable mode,

which can result in a processor halt if the JVM process hits a trap or exception.

Normally, the process stop mode is set to unstoppable by privileged code when the code is run, and set back to

stoppable mode on exit to the calling routine. While Java itself does not run in

privileged mode when executing Java bytecodes, Java application code as well as the JVM can make calls to native

code or system APIs that run privileged code. If any of these privileged routines do not reset the stop mode on exit,

it can result in a processor halt if a trap occurs. Enable this flag to avoid a processor halt in case the stop mode has

been set incorrectly by privileged code. Some applications may see performance degradation when this flag is

enabled.

-XX:+UseC3

Runs the java application with the new java hotspot compiler backend (C3) for performance.