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
recommend that you perform sizing tests before deployment with a realistic load, while
monitoring with the -Xverbosegc option and a tool like GlancePlus.
• For more on the -Xverbosegc option, see Chapter 2 (page 8).
• For more information on GlancePlus, see http://www.openview.hp.com/products/
gplus/.
• For more information on performance tuning Java™ on HP-UX, see the Performance
Tuning website.
Expanding heap size in native applications on PA-RISC HP-UX 11.11 and
later releases
If you embed libjvm in a native 32-bit application and wish to use a large Java™ heap,
you need to ensure that enough private data space is enabled. You can expand your
available memory space from 1GB to around 1.7GB on HP-UX 11.11 and later releases
by using HP-UX's EXEC_MAGIC; link your executable with "-N". On HP-UX 11.11, you
may need to install HP-UX patch PHKL_35564 (or its superseded patch) to get a larger
Java™ heap. Releases after 11.11 do not require any patches for this feature. Use the
commands shown below to get the larger Java™ heap.
• For Java™ heap greater than 1500MB:
chatr +q3p enable <executable name>
• For Java™ heap greater than 2400MB:
chatr +q3p enable +q4p enable <executable name>
Expanding heap size in native applications on Integrity HP-UX 11.23 and
later releases
If you embed libjvm in a native 32-bit application and wish to use a large Java™ heap,
you need to ensure that enough private data space is enabled. You can expand your
available memory space from 1GB to around 1.7GB on HP-UX 11.23 and later releases
by using HP-UX's EXEC_MAGIC; link your executable with "-N".
For Java™ heap greater than 1500MB:
chatr +as mpas <executable name>;
Expanding heap size in HP-UX PA-RISC
NOTE: The numbers provided in this section are approximate and might change from
release to release.
Hotspot supports heaps larger than 3GB on HP-UX PA-RISC. In theory, a process can
have 3.8GB address space. However, the address space available as java heap is smaller
than 3.8GB due to reserved address space for primordial stack, other private segment
Expanding heap size in native applications on PA-RISC HP-UX 11.11 and later releases 67