DNS Cache Information dns, Enabled | Sun Microsystems 820434310

HTTP Service Settings

With asadmin, use the following command to list the monitoring parameters available:

list --user admin --port 4848

-mserver-instance-name.http-service.*

where server-instance-nameis the name of the server instance.

Use the following command to get the values:

get --user admin --port 4848 -m server.http-service.parameter-name.*

where parameter-nameis the name of the parameter to monitor.

Statistics collection is enabled by default. Disable it by adding the following property to domain.xml and restart the server:

<property name="statsProfilingEnabled" value="false" />

Disabling statistics collection will increase performance.

You can also view monitoring statistics with the Admin Console. The information is divided into the following categories:

■“DNS Cache Information (dns)” on page 61

■“File Cache Information (file-cache)” on page 63

■“Keep Alive (keep-alive)” on page 63

DNS Cache Information (dns)

The DNS cache caches IP addresses and DNS names. Your server’s DNS cache is disabled by default. In the DNS Statistics for Process ID All page under Monitor in the web-based Administration interface the following statistics are displayed:

Enabled

If the DNS cache is disabled, the rest of this section is not displayed.

By default, the DNS cache is off. Enable DNS caching with the Admin Console by setting the DNS value to “Perform DNS lookups on clients accessing the server”.

CacheEntries (CurrentCacheEntries / MaxCacheEntries)

The number of current cache entries and the maximum number of cache entries. A single cache entry represents a single IP address or DNS name lookup. Make the cache as large as the maximum number of clients that access your web site concurrently. Note that setting the cache size too high is a waste of memory and degrades performance.

Set the maximum size of the DNS cache by entering or changing the value in the Size of DNS Cache field of the Performance Tuning page.

Chapter 3 • Tuning the Enterprise Server

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Sun Microsystems 820434310 manual DNS Cache Information dns, Enabled, CacheEntries CurrentCacheEntries / MaxCacheEntries

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 Symbol Conventions Symbol ConventionsTypographic Conventions Table P-3Typographic 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 Assign null to Variables That Are No Longer Needed String str = testing str = str + abcDeclare Methods as final Only If Necessary Declare Constants as static final Synchronize Only When Necessary Java Server Page and Servlet TuningDeclare Method Arguments final Use DataHandlers for Soap Attachments General Guidelines Suggested Coding PracticesAvoid Shared Modified Class Variables Http Session Handling 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 Cache and Pool Tuning Tips Using Local and Remote InterfacesUse the Appropriate Stubs Remove Unneeded Stateful Session Beans Prefer Local Interfaces Using Pass-By-Reference Semantics Improving Performance of EJB Transactions Configure Jdbc Resources as One-Phase Commit Resources Using Special TechniquesUse the Least Expensive Transaction Attribute Version Consistency Entity-mapping cmp-field-mapping When new.VCVERSIONNUMBER = old.VCVERSIONNUMBER Declare To enable request partitioningRequest Partitioning Cmp-field-mapping consistency 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 Use Jdbc Directly Jdbc and Database AccessEncapsulate Business Logic in Entity EJB Components Close Connections Asadmin set server.mdb-container.max-pool-size = value Tuning Message-Driven BeansUse getConnection Tune the Message-Driven Bean’s Pool Size Limit Use of JMS Connections Cache Bean-Specific Resources Deployment Settings Tuning the Enterprise Server Disable Auto-deployment Logger SettingsDisable Dynamic Application Reloading Use Pre-compiled JavaServer Pages General Settings Web Container SettingsSession Properties Session Timeout Log Levels Manager Properties Reap Interval Disable Dynamic JSP Reloading Tuning the EJB Container EJB Container SettingsMonitoring the EJB Container Overview of EJB Pooling and Caching 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 Transaction Service Settings Java Message Service SettingsMonitoring the Transaction Service Viewing Monitoring Information Disable Distributed Transaction Logging Tuning the Transaction ServiceAsadmin get -m serverInstance.transaction-service Monitoring the Http Service Http Service SettingsRecover On Restart Automatic Recovery Keypoint Interval List --user admin --port EnabledProperty name=statsProfilingEnabled value=false DNS Cache Information dns Caching DNS Entries HitRatioLimit DNS Lookups to Asynchronous NameLookups Keep Alive keep-alive File Cache Information file-cache Access Log Tuning the Http ServiceConnection Queue Request Processing Thread Count Request TimeoutInitial Thread Count Buffer Length Keep AliveMax Connections Http Protocol DNS Lookup EnabledHttp File Cache Time Out Hash Init Size Max Files CountMax Age Small/Medium File Size and File Size Limit Network Address Tuning Http Listener SettingsAcceptor Threads Overview ORB SettingsHow a Client Connects to the ORB Monitoring the ORB 3Tunable ORB Settings Tuning the ORBConnection Statistics Thread Pools 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 Tuning Thread Pools Unix /Linux only Thread Pool SettingsTo Enable Java Serialization Using JSG for Application Clients Tuning Jdbc Connection Pools Jdbc Connection Pool SettingsResources Monitoring Jdbc Connection Pools 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 TCP/IP Settings Disk I/O SettingsTo tune the TCP/IP settings Network Interface 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 Placing Hadb files on Physical Disks Memory AllocationBeware last flush/fputs took too long Vmstat -S DataBufferPoolSize PerformanceNodeNo TotalSize FreeSize Usage 512 504 LogBufferSize Tuning DataBufferPoolSizeHadbm set DataBufferPoolSize InternalLogbufferSize Tuning LogBufferSizeHadbm resourceinfo --logbuf Node No Avail Free Size NumberOfLocks Tuning InternalLogbufferSizeHadbm resourceinfo --nilogbuf Hadbm set InternalLogbufferSize Calculating the number of locks Tuning NumberOfLocksSummary Jdbc connection pool timeouts TimeoutsLoad Balancer timeouts Node No Avail Free Waits 50000 Operating System Configuration Tuning the Enterprise Server for High-AvailabilityHadb timeouts No space left on device Web-method Tuning Session Persistence FrequencyTime-based Session Size Session Persistence ScopeSession Modified-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