Oracle Audio Technologies A86828-01 JServ Overview

JServ Overview

5-2 Oracle HTTP Server powered by Apache Performance Guide

JServ Overview

Apache JServ is made up of an Apache module called mod_jserv, which runs in the

httpd process, and a servlet engine, which runs in a Java process. mod_jserv, which

is implemented in C, functions as a dispatcher, routing each servlet request to a

JServ process for execution.

The servlet engine runs in its own JVM and is solely responsible for parsing the

request and generating a response. As Figure5–1 shows, multiple JServs can service

requests. The HTTP server process and the JServ process communicate using the

Apache JServ Protocol 1.2.

Figure 5–1 Apache JServ components

Contents

Main Page Contents Send Us Your Comments Preface 1 Performance Overview 2 Monitoring Your Web Server 3 Sizing and Configuration 4 Optimizing HTTP Server Performance 5 Optimizing Apache JServ Page Page Send Us Your Comments i Page Preface Audience Assumptions Conventions Oracle Services and Support Oracle Support Services Page Page Performance Overview Performance Terms What is Performance Tuning? Response Time System Throughput Wait Time Critical Resources Effects of Excessive Demand Adjustments to Relieve Problems Setting Performance Targets Setting User Expectations Evaluating Performance Performance Methodology Factors in Improving Performance Architecture Monitoring Your Web Server Monitoring Processor Use Using the sar Utility (AIX, HP-UX, Intel Solaris) Report CPU Utilization Using the top Utility Monitoring the Web Server Using the mod_status Utility your_domain.com Interpreting Server Status Information Customizing the Server Status display Logging Server Statistics to a File Page Monitoring JServ Processes Page Page Sizing and Configuration Sizing your Hardware and Resources Understanding Concurrent Users and User Population Understanding Concurrent Users and User Population Note: The MaxClients setting in your httpd.conf file limits the Table 31 Concurrent executing users Determining CPU Requirements Secure Sockets Layer Impact on CPU Requirements Determining Memory Requirements Memory for Non-HTTP Server Software and Operating System HTTP Server Memory Requirements JServ Memory Requirements Determining Java Heap Size Servlet and OracleJSP pages Memory Requirements Number of JServ Processes Page Page Optimizing HTTP Server Performance TCP Tuning TCP Tuning Table 42 Tuning HP-UX for Performance Benchmarking Table 43 Tru64 TCP/IP Tunables Linux Tunables Raising Network Limits on Linux Systems for 2.1.100 or greater Tuning a Running System Tuning the Default and Maximum Size Tuning at Compile Time Setting TCP parameters Increasing TCP Connection Table Access Speed Specifying Retention time for Connection Table entries Increasing the Handshake Queue Length Changing the Data Transmission Rate Changing the Data Transfer Window Size MaxClients SSL Session Caching Impact of Logging Access Logging HostNameLookups Error logging HTTP/1.1 Persistent Connections Shorter Response Times Reduction in Server Workload httpd Process Availability FIN_WAIT_2 Apache Versions Optimizing Apache JServ JServ Overview Optimizing Servlet Performance Loading Servlet Classes Pre-Loading with JSPs Automatic Class Reloading Load Balancing Configuring the JServ processes Modifying jserv.conf to distribute the load Distribution of JServ Requests Using Single Thread Model Servlets What is OracleJSP? OracleJSP Page Performance Tuning Impact of Session Management Developer Mode Buffering Enhancing OracleJSP Performance Caching database connections Page Index A C D E L M O P R T U W Z