Sun Microsystems 820434310 instruction

Further Information

Further Information

For more information on tuning the JVM, see:

■Java HotSpot VM Options

■Frequently Asked Questions About the Java HotSpot Virtual Machine

■Performance Documentation for the Java HotSpot VM

■Java performance web page

■Monitoring and Management for the Java Platform (J2SE 5.0)

■The jvmstat monitoring utility

Chapter 4 • Tuning the Java Runtime System

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Sun Microsystems 820434310 manual For more information on tuning the JVM, see

Contents

Sun Microsystems, Inc Network Circle Santa Clara, CA Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide 090304@21990 Contents Tuning the Enterprise Server 100 Tuning for High-Availability Figures Page Tables Page Examples Page Table P-1Books in the Enterprise Server Documentation Set Sun GlassFish Enterprise Server Documentation Set Table P-2Default Paths and File Names Default Paths and File Names Table P-3Typographic Conventions Symbol ConventionsSymbol Conventions Typographic Conventions Third-Party Web Site References Documentation, Support, and TrainingSun Welcomes Your Comments Process Overview 1Performance Tuning Roadmap Performance Tuning Roadmap Performance Tuning Sequence Application Architecture Understanding Operational Requirements Client-Side Presentation Security Requirements User Authentication and AuthorizationEncryption Hardware Resources Administration General Tuning Concepts 2Factors That Affect Performance Capacity Planning To Determine Capacity User Expectations Further Information Avoid Serialization and Deserialization Java Programming GuidelinesUse StringBuffer to Concatenate Strings Declare Constants as static final String str = testing str = str + abcAssign null to Variables That Are No Longer Needed Declare Methods as final Only If Necessary Use DataHandlers for Soap Attachments Java Server Page and Servlet TuningSynchronize Only When Necessary Declare Method Arguments final Http Session Handling Suggested Coding PracticesGeneral Guidelines Avoid Shared Modified Class Variables Disable Security Manager Configuration and Deployment TipsOptimize SSL Goals EJB Performance TuningMonitoring EJB Components Following is a sample of the monitoring output Monitoring Individual EJB Components Asadmin get -m monitorableObject Use High Performance Beans General GuidelinesUse Caching Remove Unneeded Stateful Session Beans Using Local and Remote InterfacesCache and Pool Tuning Tips Use the Appropriate Stubs Prefer Local Interfaces Using Pass-By-Reference Semantics Improving Performance of EJB Transactions Version Consistency Using Special TechniquesConfigure Jdbc Resources as One-Phase Commit Resources Use the Least Expensive Transaction Attribute Entity-mapping cmp-field-mapping Cmp-field-mapping consistency To enable request partitioningWhen new.VCVERSIONNUMBER = old.VCVERSIONNUMBER Declare Request Partitioning Entity Beans Tuning Tips for Specific Types of EJB ComponentsStateful Session Beans Stateless Session Beans Checkpoint only when neededRead-Only Entity Beans Refresh period Pre-fetching Container Managed Relationship CMR Beans OrderTable.OrderID = OrderLineTable.OrderLineOrderID Close Connections Jdbc and Database AccessUse Jdbc Directly Encapsulate Business Logic in Entity EJB Components Tune the Message-Driven Bean’s Pool Size Tuning Message-Driven BeansAsadmin set server.mdb-container.max-pool-size = value Use getConnection Limit Use of JMS Connections Cache Bean-Specific Resources Deployment Settings Tuning the Enterprise Server Use Pre-compiled JavaServer Pages Logger SettingsDisable Auto-deployment Disable Dynamic Application Reloading Log Levels Web Container SettingsGeneral Settings Session Properties Session Timeout Manager Properties Reap Interval Disable Dynamic JSP Reloading Overview of EJB Pooling and Caching EJB Container SettingsTuning the EJB Container Monitoring the EJB Container EJB Pool Settings Tuning the EJB Pool EJB Cache Settings Tuning the EJB Cache Pool and Cache Settings for Individual EJB Components Determining the best commit option Commit Option Viewing Monitoring Information Java Message Service SettingsTransaction Service Settings Monitoring the Transaction Service Disable Distributed Transaction Logging Tuning the Transaction ServiceAsadmin get -m serverInstance.transaction-service Keypoint Interval Http Service SettingsMonitoring the Http Service Recover On Restart Automatic Recovery DNS Cache Information dns EnabledList --user admin --port Property name=statsProfilingEnabled value=false NameLookups HitRatioCaching DNS Entries Limit DNS Lookups to Asynchronous Keep Alive keep-alive File Cache Information file-cache Request Processing Tuning the Http ServiceAccess Log Connection Queue Thread Count Request TimeoutInitial Thread Count Buffer Length Keep AliveMax Connections Time Out DNS Lookup EnabledHttp Protocol Http File Cache Small/Medium File Size and File Size Limit Max Files CountHash Init Size Max Age Network Address Tuning Http Listener SettingsAcceptor Threads Monitoring the ORB ORB SettingsOverview How a Client Connects to the ORB Thread Pools Tuning the ORB3Tunable ORB Settings Connection Statistics ORB Thread Pool Parameters Tunable ORB Parameters Client ORB Properties Using multiple connectionsControlling connections between client and server ORB Examining Iiop Messages Thread Pool SizingLoad Balancing Improving ORB Performance with Java Serialization Using JSG for Application Clients Thread Pool SettingsTuning Thread Pools Unix /Linux only To Enable Java Serialization Monitoring Jdbc Connection Pools Jdbc Connection Pool SettingsTuning Jdbc Connection Pools Resources Timeout Settings Pool Size Settings4Connection Pool Sizing Connection Validation Settings Isolation Level Settings Transaction Support Connector Connection Pool Settings Testpool Page Java Virtual Machine Settings Tuning the Java Runtime System Managing Memory and Garbage Collection Tuning the Garbage Collector To use the CMS collector Choosing the Garbage Collection AlgorithmAdditional Information Tracing Garbage Collection Other Garbage Collector Settings Guidelines for Java Heap Sizing Tuning the Java Heap1Maximum Address Space Per Process Xmsvalue Xmxvalue Heap Tuning Parameters Rebasing DLLs on Windows Example 4-1Heap Configuration on SolarisSurvivor Ratio Sizing To rebase the Application Server’s DLLs Enter this command rebase -b 0x6000000 *.dll For more information on tuning the JVM, see Page Processors Server Scaling Disk Space MemoryNetworking Tuning Parameters Ndd -get /dev/tcp tcpconnhash Sizing the Connection Hash TableNetstat -nP tcpwc -l File Descriptor Setting Linux Configuration File Descriptors on IP Stack Settings on Tuning for Solaris on File Descriptors IP Stack Settings Tuning for Linux platforms Soft Nofile 65535 Hard Virtual MemorySession required /lib/security/pamlimits.so Network Interface Disk I/O SettingsTCP/IP Settings To tune the TCP/IP settings Tuning Operating System and TCP Settings Tuning UltraSPARC T1-Based Systems 2Tuning 64-bit Systems for Performance Benchmarking Network Configuration Disk ConfigurationStart Options 106 Disk Use Tuning HadbCalculating Hadb Data Device Size Hadbm set TotalDatadeviceSizePerNode Tuning Data Device Size Vmstat -S Memory AllocationPlacing Hadb files on Physical Disks Beware last flush/fputs took too long DataBufferPoolSize PerformanceNodeNo TotalSize FreeSize Usage 512 504 LogBufferSize Tuning DataBufferPoolSizeHadbm set DataBufferPoolSize Node No Avail Free Size Tuning LogBufferSizeInternalLogbufferSize Hadbm resourceinfo --logbuf Hadbm set InternalLogbufferSize Tuning InternalLogbufferSizeNumberOfLocks Hadbm resourceinfo --nilogbuf Calculating the number of locks Tuning NumberOfLocksSummary Node No Avail Free Waits 50000 TimeoutsJdbc connection pool timeouts Load Balancer timeouts No space left on device Tuning the Enterprise Server for High-AvailabilityOperating System Configuration Hadb timeouts Web-method Tuning Session Persistence FrequencyTime-based Modified-session Session Persistence ScopeSession Size Session Checkpointing Stateful Session Beans Configuring the Jdbc Connection Pool Enabling the Health Checker Configuring the Load Balancer Tuning for High-Availability 121 122 Index Index 125 Monitoring transaction service Session timeout 128