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
Features
FastSwing (version 1.3x only)
FastSwing is an HP feature which provides significant performance improvement for
Swing Applications on a Remote X-Server. In HP's SDK 1.4.x and later, the FastSwing
option is ignored because the Java™ 1.4 performance enhancements provide
out-of-the-box performance for both local and remote displays, equivalent to FastSwing.
To use this feature invoke java or appletviewer as follows:
/opt/java1.3/bin/java -Dhp.swing.useFastSwing=true MyApp
or
/opt/java1.3/bin/appletviewer -J-Dhp.swing.useFastSwing=true applet.html
Currently we recommend using this feature only for Remote displays as it has the
following caveat:
Double-buffered Swing Components cannot perform Graphics2D operations with the
FastSwing feature turned on. When doing so you will get the following exception:
java.lang.ClassCastException: sun.awt.motif.X11OffScreenImage at
BezierAnimationPanel.run(BezierAnimationPanel.java:223) at
java.lang.Thread.run(Unknown Source)
Non-blocking I/O Poll API (SDK 1.3 and 1.4, deprecated in 5.0)
com.hp.io.Poll supports a general mechanism for reporting I/O conditions associated
with a set of FileDescriptors and for waiting until one or more conditions becomes true.
Specified conditions include the ability to read or write data without blocking, and
error conditions. Use of com.hp.io.Poll dramatically reduces the number of threads
required to support large numbers of clients in large server-side Java™ applications.
IPv6 support (Internet Protocol version 6) - SDK 1.4.2.x and later
IPv6 is a set of Internet Protocol specifications designed to provide enhancements over
the capabilities of the existing IPv4 service in terms of scalability, security, mobility,
ease-of-configuration, and real-time traffic handling.
For more information about IPv6, see Oracle's Networking IPv6 User Guide for J2SDK/JRE
1.4 at http://download.oracle.com/javase/1.4.2/docs/guide/net/ipv6_guide/
HP-UX 11i v1 (11.11), 11i v2 (11.23), and 11i v3 (11.31) support dual protocol stacks
IPv4 and IPv6. IPv6 is not currently supported on HP-UX 11.0 or 11.22 (11i v1.5). To
support IPv6, HP-UX 11i v1 (11.11) requires HP-UX patches; HP-UX 11i v2 (11.23) and
11i v3 (11.31) do not. See the following table for IPv6 support information.
Features 29