Migrating Java Applications to HP-UX

ManualsBrandsHP ManualsSoftwareHP-UX Java Software

August 2010

Technical white paper

Table of Contents

Introduction ...................................................................................................................................3

Essential Tools on HP-UX for Java Applications..................................................................................... 3

HPjconfig...................................................................................................................................3

Java Out-of-Box (JavaOOB)...........................................................................................................4

HPjmeter.................................................................................................................................... 4

Collecting Profile Data for HPjmeter ............................................................................................5

Collecting Garbage Collection Data for HPjmeter.......................................................................... 7

GlancePlus (glance or gpm) .......................................................................................................... 8

gpm (GUI mode)...................................................................................................................... 9

Glance Screen Mode .............................................................................................................10

Glance Adviser Mode ............................................................................................................ 10

Other Tools .............................................................................................................................. 11

Configuring Patches and Kernel Parameters for Java on HP-UX ............................................................ 11

Running HPjconfig in GUI mode (default)...................................................................................... 12

Running HPjconfig in non-GUI mode............................................................................................. 14

Key Factors Affecting Performance................................................................................................... 14

Java Heap Size and Garbage Collection Behavior..........................................................................15

Garbage Collection in HP's Hotspot JVM ................................................................................... 15

JVM Heap and GC Parameters ................................................................................................ 16

Default GC Policies and Heap Settings on HP-UX ........................................................................ 17

Migrating from Solaris............................................................................................................ 17

Migrating from IBM/AIX ......................................................................................................... 18

Confirm Garbage Collection Behavior using HPjmeter.................................................................. 19

Thread Behavior and Lock Contention........................................................................................... 24

Detecting Lock Contention in Your Application............................................................................ 24

Reducing Lock Contention in Your Application ............................................................................ 28

Deployment of Java Instances and Processor Usage......................................................................... 30

Other Factors ...........................................................................................................................35

OS Scheduler........................................................................................................................ 35

Hyper-threading .................................................................................................................... 35

Other Java Options................................................................................................................ 35

System Components............................................................................................................... 36

Memory Footprint of Migrated Java Application................................................................................. 36

Java Process Memory Footprint.................................................................................................... 36

Tools to Examine Java Process Memory Footprint ............................................................................ 37

Threads in the Java Process.........................................................................................................38

Reducing Starting Footprint .........................................................................................................38

For More Information..................................................................................................................... 40

Call to Action............................................................................................................................... 40

Summary of content (40 pages)

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Migrating Java Applications to HP-UX August 2010 Technical white paper Table of Contents Introduction ................................................................................................................................... 3 Essential Tools on HP-UX for Java Applications..................................................................................... 3 HPjconfig...................................................................................................................................
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Introduction HP offers a full range of Java technology products on HP-UX 11i systems. We provide solutions to develop or deploy Java applications with the best performance on HP PA-RISC 11i v1(11.11), 11i v2 (11.23), 11i v3 (11.31), and HP Itanium 11i v2 (11.23) and 11iv3 (11.31). This document provides guidance on how to easily migrate your existing java applications from other platforms to HP-UX.
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Java Out-of-Box (JavaOOB) Java Out-of-Box (JavaOOB) is a stand-alone bundle intended for large server-side Java applications. Upon installation, it will install startup (RC) scripts, modify kernel parameters, and if necessary, rebuild the kernel and reboot the system. These modifications provide better "Out-of-the-Box" behavior for Java. JavaOOB may have already been installed on your HP-UX system, in which case, the kernel parameters will have already been updated for Java.
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o o o o o o o • Graphic display of profiling data Threads histogram and lock contention metrics CPU/clock time metrics for Java methods Call graphs with call count, CPU, or clock time Per-thread display of time spent in nine different states Per-thread or per-process display of metrics Reference trees for heap analysis In-depth garbage collection analysis: o o o o Graphical display of Java heap usage and garbage collector behavior over time Details of GC type, GC frequency, GC duration, object creation r
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java_.eprof NOTE: If you are running JDK 1.5.0.04 or later, the command-line option is not required to capture eprof data. Instead, you can toggle eprof data gathering on and off by sending signals to the currently running Java VM. One log file is produced per sample period; the name for the log file is java_.eprof. The SIGUSR2 signal toggles the recording of eprof data. Use the following process to gather eprof data for specific periods: • • Send SIGUSR2 to the Java VM process.
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over each category in the cascading menu to reveal the relevant metrics for that category. The following screen shows the available metrics for the threads/locks category: Figure 2 HPjmeter — Threads/Locks Metrics Collecting Garbage Collection Data for HPjmeter The following steps summarize how to collect and view garbage collection data from your application. When running Java on HP-UX: 1. Add the -Xverbosegc option to the Java command line. $ java -Xverbosegc:file= ....
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4. Click File—>Open File to browse for and open the data file. 5. A GC viewer screen opens and displays a set of tabs containing metric data. The following figure shows the Garbage Collection Summary Analysis screen: Figure 3 HPjmeter Garbage Collection Summary Analysis Screen When running Java on non-HP-UX platforms: 1. Collect GC data using -Xloggc option. $ java -Xloggc:filename ... 2. For more detailed GC output, add -XX:+PrintGCDetails or -XX:+PrintHeapAtGC $ java ...
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(Your OE may already come with GlancePlus installed.) This section provides brief highlights on using glance/gpm to monitor Java applications. There are 3 ways to run glance or gpm: • • • gpm (GUI mode) glance screen mode glance advisor mode gpm (GUI mode) gpm is the graphical version of GlancePlus. It provides extensive information on all aspects of your system (CPU, memory, disk, and network activity) and detailed information about your processes and threads in your process.
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Detailed on-line help is provided on the Main Panel. Additional examples of using gpm are provided in the section “Key Factors Affecting Performance.” Glance Screen Mode If you only have a terminal window available and cannot invoke gpm, a screen mode of glance is available. But this can be fairly cumbersome to use, and the command letters are not particularly intuitive. gpm is far preferable.
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Here is an example of partial output from running the glance adviser script: GBLH: date time swap nfile cpu_tot cpu_sys cpu_usr run_q mem_virt mem_res pageout_rate pageout_rate_cum b ufcache_hit_pct disk_io net_in_pkt_rate net_in_err_rate net_out_pkt_rate net_out_err_rate GBL: 05/28/2010 13:33:00 16 1 50 5 46 0 7995mb 21.45 0 0 99.30 1.60 12471 0 13779 0 PH: proc_name pid cpu cpu_sys cpu_usr vss rss data_vss data_rss threads files io disk_io P: java 28818 323.60 27.30 296.
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Running HPjconfig in GUI mode (default) To run HPjconfig in GUI mode: 1. 2. 3. 4. cd to the directory where HPjconfig is installed. Set the DISPLAY variable. Set the path to java. To bring up the GUI with default log file name (for example: HPjconfig___.log): $ java -jar ./HPjconfig.jar To bring up the GUI with specified log file: $ java -jar ./HPjconfig.jar -logfile 5.
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Figure 6 HPjconfig — Application Tab Figure 7 HPjconfig — Patches Tab Figure 8 HPjconfig — Tunables Tab 13
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Running HPjconfig in non-GUI mode The following is the -help information for HPconfig: usage: HPjconfig [ options ] -gui HPjconfig [ options ]

Migrating Java Applications to HP-UX

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