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To properly tune one must Understand the TCP protocol Understand how the CPU works Understand load balancers and their algorithmsġ4 TCP Layer 4 in the OSI stack Session based No more than 5x20mb files handlers = .FileHandler,… .FileHandler.pattern = $/logs/catalina.%g.log .FileHandler.limit = .unt = 5 12ġ3 Tomcat in Production Tuning Tomcat connectors server.xml handlers = .FileHandler 11ġ2 Logging Overflow protection Size based rotation using JVM logger One global configuration for entire JVM Synchronous loggingġ1 Logging Remove duplicate logging (logging.properties)Īdjusted catch all logger.
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Implements a per-class-loader logger Simply drop logging.properties into your web application and logging is configured Synchronous logging No file limitġ0 Logging Java Virtual Machine logger Rotated based on size Years of adjusting log levels pays off Doesn't log what you don't need to see A few gotcha's with the default configuration Catch all logger creates duplicate logs Standard out – often piped to catalina.out Log file on the file system Synchronized logging No overflow protectionĩ Logging Tomcat's logger Rotated based on date Out of the Box Tomcat Tomcat is ready for production JVM settings must be applied Default memory settings usually too small for most web applications Tuning is limited So we can cover most of it Hard to profile in production Application tuning most important 80% or more of request time is typically spent inside the application Tomcat tuning is fairly limited Divided between JVM tuning and Tomcat connectors Requires lower level of understanding Identify the current bottleneck Focus on one item at a time Fix the root cause Easy to get side tracked 5Ħ The Process When possible, tune pre-production Stabilise the system Set Performance Targets Web applications are easy Only one consideration request/response time 4ĥ The Process Measure current performance Tuning your connectors Content delivery and caching Tuning the JVMĤ The Process Understand the system architecture! and its functionality ApacheCon Tomcat Performance Tuning in Production Filip Hanik SpringSource Amsterdam, 2009ģ Agenda Performance Tuning Process Logging improvements TCP and HTTP