EAServer Performance Tuning Techniques

Use operating system tools and utilities to monitor and gather information about process and resource utilization.

Microsoft Windows platforms:

You should always stress test an application before putting it into production. A variety of stress testing tools are available, to help you simulate a load to test if the application will scale and perform at acceptable levels. Some of the tools are available free of cost. For example, OpenSTA is free from http://www.opensta.org/

A whitepaper is available that points out the fundamentals involved in an application server benchmark, and outlines the results for EAServer tests for the nile.com benchmark.

  Section 12: PowerDynamo

This section includes suggestions for those sites that use PowerDynamo.

Category Performance Considerations More Information Achieving Optimum Performance with PowerDynamo How to optimize performance using caching, scheduling, load balancing, minimizing use of expensive methods and properties, and more Chapter 10 of the PowerDynamo User's Guide Tracing Ensure both the EAServer property com.sybase.jaguar.server.dynamo.trace and PowerDynamo trace configuration setting are set to false. "Repository Properties Reference" in EAServer System Administration Guide, and "Changing Dynamo configuration settings" in the PowerDynamo User's Guide Data Source configuration If you are connecting to a database server on the same machine as the Web server, do not select Client as the Agent. This would result in the local connection being made through the network, which would cause a decline in performance. "Setting up the Adaptive Server Anywhere database server for PowerDynamo" in the PowerDynamo User's Guide Text substitution Rather than text substitution, significant performance improvements can result in some circumstances using host variables in a SQL statement, since it can be executed repeatedly without being reparsed "Text substitution and host variables" in the PowerDynamo User's Guide Connection pool settings Configure the connection pool minimum, maximum, and timeout for optimum results "Managing the connection pool" in the PowerDynamo User's Guide Temporary connections Avoid using temporary connections, since they do not utilize pooling. "Working with connections" in the PowerDynamo User's Guide Script and Template properties If a script or template does not require any connections to a database to complete execution, specifying <no connection> in the definition, so that no connection object is created during the execution of the document. "Using <no connection>" in the PowerDynamo User's Guide Performance Monitor On NT, use the performance monitor for feedback on utilization and processing of caches, queries, scripts, and requests "Using the Performance Monitor" in the PowerDynamo User's Guide Java Class Cache To improve performance, information about the methods and properties of Java classes is cached. "Configuring Dynamo to use Java" in the PowerDynamo User's Guide Java class storage Java classes can be accessed from within a database or within the file system. If you do not need the Java classes stored in the database (for replication or other reasons), you should store them in the file system for performance reasons. "Using Java in a PowerDynamo script" in the PowerDynamo User's Guide XML Document Nodes It is generally more efficient to use explicit objects instead of the generic node interface to XML documents. "The object interface to XML documents" in the PowerDynamo User's Guide XML Document parsing Parsing large documents with toDOMDocument can be expensive. Design your site so this occurs as infrequently as possible. You can avoid unnecessary parsing of the document by attaching the DOMDocument object to the session object. "Creating the DOMDocument object" in the PowerDynamo User's Guide

Section 13: Localization

Category Performance Considerations More Information Global Sort component The Global Sort component, which provides high performance sorting of small to medium length lists and supports multiple alphabets and sort orders. This feature is documented in Using Global Sort. Using Global Sort XML conversion The XML conversion module (XCM) tool is a high-performance EAServer component development tool that provides encoding verification and character set conversion for XML data. Using the XCM Tool describes how to use this feature. Using the XCM Tool

Section 14 -- Development Environment

Category Performance Considerations More Information Deployment and code generation

EAServer 4.0 introduces Java-to-IDL and IDL-to-Java code generation optimizations. These optimizations can increase your productivity when you deploy Java based applications with complicated component class hierarchies and when you generate Java stubs for these applications. The J2EE EAR importer, EJB JAR importer, and the Java code generator have been enhanced to allow you to specify a code generation strategy as follows:

• Full - Always generates Java or IDL types for every interface and type.
• Incremental - Compares IDL and Java timestamps to determine whether new versions must be generated. Java timestamps are maintained in a database in the EAServer repository.
• Optimistic - Similar to Incremental, except that the check for changed types in each IDL module or Java package ends if the first comparison indicates no change.

Additional Information

It is important to review performance information for the languages, operating systems, databases, protocols, etc you are working with.

Here are a few sample links to get you started.

Java Related:

• Java Developer Connection: java.sun.com/developer/onlineTraining/Programming/JDCBook/perfTech.html">Advanced Programming for the Java 2 Platform Chapter 8: Performance Techniques
• Java Developer Connection: java.sun.com/docs/books/performance/">JAVA PLATFORM PERFORMANCE STRATEGIES AND TACTICS
  
• JavaWorld: Design for performance. Part 1: Interfaces matter, Part 2: Reduce object creation, Part 3: Remote interfaces
• JavaWorld: Java performance programming, Part 1: Smart object-management saves the day

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