25th September, 2020
HotSpot JIT JVM: -server
Memory Allocation: -Xms, -Xmx, -Xss
Minor vs. Full GC
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GC should run as infrequently and as quickly as possible
Example: -XX:NewSize=80m -XX:MaxNewSize=80m -Xms400m -Xmx400m -XX:+UseParallelGC -XX:ParallelGCThreads=2
Use 64bit Hardware/OS/JVM to be able to allocate over 4GB
Do not use extra-large or extra small heaps
Use the multi-processor/core machine to take advantage of parallel GC
Use Sun’s Java 5 JVM (self-tuning) over 1.4 (or older)
Tuning GC on Java
Tune connectors in server.xml maxThreads + 25% = max minSpareThreads + 5% = normal maxSpareThreads + 5% = peak Remove unnecessary Valves, Loggers, and Connectors Precompile JSPs Turn off "development" mode on jsp handler (servlet) in conf/web.xml Session timeout JSPs can be precompiled (by developers or assemblers) using Ant’s jspc task.
By default JBoss creates a new thread for each RMI request Wasteful and unscalable during spikes Switch to pooled invoker In conf/standardjboss.xml replace all occurrences of :jboss:service=invoker,type=jrmp by jboss:service=invoker,type=pooled
System-wide logging set on DEBUG or TRACE can bring JBoss to a standstill Configured in conf/log4j.xml By default, JBoss uses INFO priority and logs to both CONSOLE and FILE
Consider changing the <root> priority to ERROR
Consider logging to FILE only
Consider using category filters for your own class hierarchies
<category name="my.package"> <priority value="INFO"/> </category> <root> <priority value="ERROR" /> <appender-ref ref="FILE"/> </root>
Increase the scan frequency of the deployment scanner (default: 5 secs) Consider setting MinimumSize on [stateless] Session Bean Container pool (conf/standardjboss.xml) Use Hibernate in place of CMP (2.x) Avoid XA connection pools Use JDBC drivers to check on connections
Remove services that are not needed Not a huge impact on performance Frees up memory and other resource (like threads) Faster JBoss startup Excellent security practice Breaks Java EE TCK Create a new configuration set (copy of default) Services that can be trimmed include the following: Mail Service (and libraries) Cache Invalidation Service J2EE client deployer service HAR deployer and Hibernate session management services Hypersonic (provide a different DefaultDS for JMS MQ) JMS MQ HTTP Invoker (RMI over HTTP) Support for XA Data Sources JMX Console JMX Invoker Adaptor (JMX calls over RMI) Web Console JSR-177 for JMX Console/Email Monitor Alerts Properties Service Scheduler Service/Manager UUID key generation EAR Deployer JMS Queue Destination Manager CORBA/IIOP Service Client User Transaction Service Attribute Persistence Service RMI Classloader Remote JNDI Naming JNDI View Pooled Invoker Bean Shell Deployer
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