Oracle Audio Technologies A86828-01 HTTP/1.1

HTTP/1.1

Optimizing HTTP Server Performance 4-11

to log IP addresses. You can resolve IP addresses to host names off-line, with the

logresolve utility (found in the $ORACLE_HOME/Apache/Apache/bin/ directory).

For more information, s ee Dale Gaudet’s Apache Performance Notes at:

http://www.apache.org/docs/misc/perf-tuning.html

Error logging

The server notes unusual activity in an error log. The ErrorLog and LogLevel

directives identify the log file and the level of detail of the messages recorded. The

default level is warn. There was no difference in static page performance on a

loaded system between the warn, info, and debug levels.

For more information on the LogLevel directive, see:

http://www.apache.org/docs/mod/core.html#loglevel

HTTP/1.1

The Oracle HTTP server can use HTTP/1.1. Netscape Navigator 4.0 still uses

HTTP/1.0, with some 1.1 features, such as persistent connections. Internet Explorer

uses HTTP/1.1. The performance benefit of persistent connections comes from

reducing the overhead of repeatedly establishing and tearing down connections

(one per request). A persistent connection accepts multiple requests from a user.

For a small static page request, the connection latency can equal or exceed the

response latency (the time to fulfill the request after the connection is established),

so using persistent connections can result in major performance gains.

For more information about performance and the HTTP/1.1 protocol, see:

http://www.w3.org/Protocols/HTTP/Performance/Pipeline.html

Persistent Connections

If your users’ browsers support persistent connections (the default behavior of

HTTP/1.1), you can support them on the server using the KeepAlive directives in

Apache. (Some browsers that do not support all HTTP/1.1 features do support

persistent connections; for example, recent versions of Netscape.)

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