Entity Beans, Stateful Session Beans | Sun Microsystems 820434310

EJB Performance Tuning

For example, enable threadpools named priority-1 and priority-2 to the <orb> element as follows:

<orb max-connections="1024"message-fragment-size="1024"use-thread-pool-ids="thread-pool-1,priority-1,priority-2">

3Include the threadpool ID in the use-thread-pool-idelement of the EJB component’s sun-ejb-jar.xmldeployment descriptor.

For example, the following sun-ejb-jar.xml deployment descriptor for an EJB component named “TheGreeter” is assigned to a thread pool named priority-2:

<sun-ejb-jar> <enterprise-beans>

<unique-id>1</unique-id> <ejb>

<ejb-name>TheGreeter</ejb-name> <jndi-name>greeter</jndi-name> <use-thread-pool-id>priority-1</use-thread-pool-id>

</ejb> </enterprise-beans>

</sun-ejb-jar>

4Restart the Application Server.

Tuning Tips for Specific Types of EJB Components

This section provides tips for tuning various specific types of EJB components:

■“Entity Beans” on page 42

■“Stateful Session Beans” on page 42

■“Stateless Session Beans” on page 43

■“Read-Only Entity Beans” on page 43

■“Pre-fetching Container Managed Relationship (CMR) Beans” on page 44

Entity Beans

Depending on the usage of a particular entity bean, one should tune max-cache-size so that beans that are used less (for example, an order that is created and never used after the transaction is over) are cached less, and beans that are used frequently (for example, an item in the inventory that gets referenced very often), are cached more in numbers.

Stateful Session Beans

When a stateful bean represents a user, a reasonable max-cache-size of beans is the expected number of concurrent users on the application server process. If this value is too low (in relation

42	Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 2009

Image 42

Sun Microsystems 820434310 manual Tuning Tips for Specific Types of EJB Components, Entity Beans, Stateful Session Beans

Contents

Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide Sun Microsystems, Inc Network Circle Santa Clara, CA 090304@21990 Contents Tuning the Enterprise Server 100 Tuning for High-Availability Figures Page Tables Page Examples Page Sun GlassFish Enterprise Server Documentation Set Table P-1Books in the Enterprise Server Documentation Set Default Paths and File Names Table P-2Default Paths and File Names Typographic Conventions Symbol ConventionsSymbol Conventions Table P-3Typographic Conventions Documentation, Support, and Training Third-Party Web Site ReferencesSun Welcomes Your Comments 1Performance Tuning Roadmap Process Overview Performance Tuning Sequence Performance Tuning Roadmap Understanding Operational Requirements Application Architecture Client-Side Presentation User Authentication and Authorization Security RequirementsEncryption Hardware Resources General Tuning Concepts Administration Capacity Planning 2Factors That Affect Performance User Expectations To Determine Capacity Further Information Java Programming Guidelines Avoid Serialization and DeserializationUse StringBuffer to Concatenate Strings Declare Methods as final Only If Necessary String str = testing str = str + abcAssign null to Variables That Are No Longer Needed Declare Constants as static final Declare Method Arguments final Java Server Page and Servlet TuningSynchronize Only When Necessary Use DataHandlers for Soap Attachments Avoid Shared Modified Class Variables Suggested Coding PracticesGeneral Guidelines Http Session Handling Configuration and Deployment Tips Disable Security ManagerOptimize SSL EJB Performance Tuning GoalsMonitoring EJB Components Following is a sample of the monitoring output Asadmin get -m monitorableObject Monitoring Individual EJB Components General Guidelines Use High Performance BeansUse Caching Use the Appropriate Stubs Using Local and Remote InterfacesCache and Pool Tuning Tips Remove Unneeded Stateful Session Beans Using Pass-By-Reference Semantics Prefer Local Interfaces Improving Performance of EJB Transactions Use the Least Expensive Transaction Attribute Using Special TechniquesConfigure Jdbc Resources as One-Phase Commit Resources Version Consistency Entity-mapping cmp-field-mapping Request Partitioning To enable request partitioningWhen new.VCVERSIONNUMBER = old.VCVERSIONNUMBER Declare Cmp-field-mapping consistency Tuning Tips for Specific Types of EJB Components Entity BeansStateful Session Beans Checkpoint only when needed Stateless Session BeansRead-Only Entity Beans Pre-fetching Container Managed Relationship CMR Beans Refresh period OrderTable.OrderID = OrderLineTable.OrderLineOrderID Encapsulate Business Logic in Entity EJB Components Jdbc and Database AccessUse Jdbc Directly Close Connections Use getConnection Tuning Message-Driven BeansAsadmin set server.mdb-container.max-pool-size = value Tune the Message-Driven Bean’s Pool Size Cache Bean-Specific Resources Limit Use of JMS Connections Tuning the Enterprise Server Deployment Settings Disable Dynamic Application Reloading Logger SettingsDisable Auto-deployment Use Pre-compiled JavaServer Pages Session Properties Session Timeout Web Container SettingsGeneral Settings Log Levels Disable Dynamic JSP Reloading Manager Properties Reap Interval Monitoring the EJB Container EJB Container SettingsTuning the EJB Container Overview of EJB Pooling and Caching Tuning the EJB Pool EJB Pool Settings Tuning the EJB Cache EJB Cache Settings Pool and Cache Settings for Individual EJB Components Commit Option Determining the best commit option Monitoring the Transaction Service Java Message Service SettingsTransaction Service Settings Viewing Monitoring Information Tuning the Transaction Service Disable Distributed Transaction LoggingAsadmin get -m serverInstance.transaction-service Recover On Restart Automatic Recovery Http Service SettingsMonitoring the Http Service Keypoint Interval Property name=statsProfilingEnabled value=false EnabledList --user admin --port DNS Cache Information dns Limit DNS Lookups to Asynchronous HitRatioCaching DNS Entries NameLookups File Cache Information file-cache Keep Alive keep-alive Connection Queue Tuning the Http ServiceAccess Log Request Processing Request Timeout Thread CountInitial Thread Count Keep Alive Buffer LengthMax Connections Http File Cache DNS Lookup EnabledHttp Protocol Time Out Max Age Max Files CountHash Init Size Small/Medium File Size and File Size Limit Tuning Http Listener Settings Network AddressAcceptor Threads How a Client Connects to the ORB ORB SettingsOverview Monitoring the ORB Connection Statistics Tuning the ORB3Tunable ORB Settings Thread Pools Tunable ORB Parameters ORB Thread Pool Parameters Using multiple connections Client ORB PropertiesControlling connections between client and server ORB Thread Pool Sizing Examining Iiop MessagesLoad Balancing Improving ORB Performance with Java Serialization To Enable Java Serialization Thread Pool SettingsTuning Thread Pools Unix /Linux only Using JSG for Application Clients Resources Jdbc Connection Pool SettingsTuning Jdbc Connection Pools Monitoring Jdbc Connection Pools Pool Size Settings Timeout Settings4Connection Pool Sizing Isolation Level Settings Connection Validation Settings Connector Connection Pool Settings Transaction Support Testpool Page Tuning the Java Runtime System Java Virtual Machine Settings Tuning the Garbage Collector Managing Memory and Garbage Collection Choosing the Garbage Collection Algorithm To use the CMS collectorAdditional Information Other Garbage Collector Settings Tracing Garbage Collection Tuning the Java Heap Guidelines for Java Heap Sizing1Maximum Address Space Per Process Heap Tuning Parameters Xmsvalue Xmxvalue Example 4-1Heap Configuration on Solaris Rebasing DLLs on WindowsSurvivor Ratio Sizing Enter this command rebase -b 0x6000000 *.dll To rebase the Application Server’s DLLs For more information on tuning the JVM, see Page Server Scaling Processors Memory Disk SpaceNetworking Tuning Parameters Sizing the Connection Hash Table Ndd -get /dev/tcp tcpconnhashNetstat -nP tcpwc -l Linux Configuration File Descriptor Setting Tuning for Solaris on File Descriptors on IP Stack Settings on IP Stack Settings File Descriptors Tuning for Linux platforms Virtual Memory Soft Nofile 65535 HardSession required /lib/security/pamlimits.so To tune the TCP/IP settings Disk I/O SettingsTCP/IP Settings Network Interface Tuning UltraSPARC T1-Based Systems Tuning Operating System and TCP Settings 2Tuning 64-bit Systems for Performance Benchmarking Disk Configuration Network ConfigurationStart Options 106 Tuning Hadb Disk UseCalculating Hadb Data Device Size Tuning Data Device Size Hadbm set TotalDatadeviceSizePerNode Beware last flush/fputs took too long Memory AllocationPlacing Hadb files on Physical Disks Vmstat -S Performance DataBufferPoolSizeNodeNo TotalSize FreeSize Usage 512 504 Tuning DataBufferPoolSize LogBufferSizeHadbm set DataBufferPoolSize Hadbm resourceinfo --logbuf Tuning LogBufferSizeInternalLogbufferSize Node No Avail Free Size Hadbm resourceinfo --nilogbuf Tuning InternalLogbufferSizeNumberOfLocks Hadbm set InternalLogbufferSize Tuning NumberOfLocks Calculating the number of locksSummary Load Balancer timeouts TimeoutsJdbc connection pool timeouts Node No Avail Free Waits 50000 Hadb timeouts Tuning the Enterprise Server for High-AvailabilityOperating System Configuration No space left on device Tuning Session Persistence Frequency Web-methodTime-based Session Session Persistence ScopeSession Size Modified-session Configuring the Jdbc Connection Pool Checkpointing Stateful Session Beans Configuring the Load Balancer Enabling the Health Checker Tuning for High-Availability 121 122 Index Index 125 Monitoring transaction service Session timeout 128