HP-UX Programmer's Guide for Java 2
Table Of Contents
- Table of Contents
- 1 Introduction
- 2 HotSpot Technology Tools and Commands
- 3 Configuration for Java™ Support
- 4 Performance and Tuning
- 5 Measuring System Performance
- 6 Using Threads
- 7 Using Signals
- 8 Using Java™ 2 JNI on HP-UX
- 9 Expanding Memory
- Determine your requirements
- Memory layout under HP-UX 11.0 (PA-RISC only)
- Additional memory available under HP-UX 11i (PA-RISC only)
- Allocating physical memory and swap in the Java™ heap
- Useful key command-line options for allocating memory
- Application-dependent considerations using large heap size HP-UX 11i PA-RISC
- Expanding heap size in native applications on PA-RISC HP-UX 11.11 and later releases
- Expanding heap size in native applications on Integrity HP-UX 11.23 and later releases
- Expanding heap size in HP-UX PA-RISC
- Expanding heap size in HP-UX Integrity
- 10 Diagnosing Memory Leaks
- A JDK/JRE 6.0.n and 7.0.n Usage Notes
- Using Java 2 JNI on HP-UX
- Garbage collection
- Asian TrueType fonts and Asian locales
- Date/Time methods defaults
- Profiling
- Compatibility with previous releases
- Java Cryptography Extension (JCE) policy files
- Configuring the Java Runtime Plug-In
- CLASSPATH environment variable
- Java Web Start technology usage
- Upgrading from a previous Java Web Start version
- IPv6 support
- Allocation Site Statistics and Zero Preparation -Xverbosegc
- JDK 6.0.04 flags
- GC log-rotation support
- NUMA collector enhancements
- ThreadDumpPath support
- Garbage-First garbage collector (-XX:+UseG1GC)
- jmap, jinfo, and jstack tools included in JDK 6.0.03
- Additional Java Web Start documentation
- B JDK/JRE 5.0.n Usage Notes
- Using Java 2 JNI on HP-UX
- Garbage collectors: Parallel and Concurrent Mark Sweep
- Allocating physical memory and swap in the Java heap
- Asian TrueType fonts and Asian locales
- Date/Time methods defaults
- Profiling
- Closing a socket (PA-RISC only)
- Compatibility with previous releases
- Java Cryptography Extension (JCE) policy files
- Allocation Site Statistics and Zero Preparation -Xverbosegc
- IPv6 support on Java 5.0
- GC log-rotation support in 5.0
- ThreadDumpPath support in 5.0
- Dynamically loaded libraries in 5.0
- Performance improvement for String.intern()
- Configuring the Java Runtime Plug-In
- CLASSPATH environment variable
- Java Web Start technology usage
- C SDK/RTE 1.4.2.n Usage Notes
- Removing support for unwanted architectures in the JRE
- Support for dynamic thread local storage (TLS)
- Signal Chaining functionality
- Using Java 2 JNI on HP-UX
- HotSpot JVM options
- Garbage collectors: Parallel and Concurrent mark sweep
- Allocating physical memory and swap in the Java heap
- Asian TrueType fonts and Asian locales
- Date/Time methods defaults
- Profiling
- Closing a socket when accept or read is pending (PA-RISC) - new patch information!
- Compatibility with previous releases
- Runtime Plug-In usage and configuration
- GC log-rotation support
- ThreadDumpPath support
- D Additional Resources
- Index
Specifies the maximum amount of memory in bytes that the Java™ NIO library can
allocate for direct memory buffers. The default is 64 megabytes, which corresponds to
-XX:MaxDirectMemorySize=64m. The use of direct memory buffers can minimize
the copying cost when doing I/O operations.
-XX:MaxNewSize=<size>
Sets the maximum size of new generation (in bytes). The arguments can now be followed
by either 'k' or 'm' to specify KB or MB. For 1.2, specify KB only. Not supported in 1.3.
-XX:MaxPermSize=<size>
Sets the maximum size of permanent generation (in bytes). Append the letter k or K
to indicate kilobytes, or m or M to indicate megabytes. For example,
-XX:MaxPermSize=32m specifies a value of 32MBytes for MaxPermSize (Note that
in SDK 1.2.2, this option took an integer that specified a value in kbytes only).
Default: 64MB
-XX:PermSize=<size>
Specifies the initial size, in bytes, of the Permanent Space memory allocation pool. This
value must be a multiple of 1024 greater than 1MB. Append the letter k or K to indicate
kilobytes, or m or M to indicate megabytes.
-XX:PermSize=6291456
Examples:
-XX:PermSize=6144k
-XX:PermSize=6m
-XX:PermSize=16m (1.4 and later)
Default:
-XX:NewSize=<size>
Sets the default size, in bytes, of new generation. Append the letter k or K to indicate
kilobytes, or m or M to indicate megabytes. (For 1.2, specify KB only). Not supported
in 1.3.
-XX:NewSizeThreadIncrease=<size>
Sets the additional size, in bytes, added to desired new generation size per non-daemon
thread. (Note that in SDK 1.2.2, this option took an integer that specified a value in
kbytes only).
-XX:-NoHandoff (version 1.3 and later)
XX:-NoHandoff works in conjunction with the new functionality added in HP-UX
11.11 HP-UX patch PHCO_25226. In HP-UX 11.22 and later, this option has less impact
than for HP-UX 11.11.
-XX:PrefetchCopyIntervalInBytes=n
Prefetch n bytes ahead for scavenge copy destination area. The default is 0. The ideal
value may vary depending on the processor.
24 HotSpot Technology Tools and Commands