Simple summary of tomcat performance optimization methods

Tomcat itself optimization

• Tomcat Memory Optimization
  • Tell JVM I want a large memory block when starting (tuning memory is the most direct way)
  • We can set the java_OPTS parameter in the tomcat startup script catalina.sh
  • JAVA_OPTS Parameter Description
    • server Enable the server version of jdk
    • Xms The minimum memory when the Java virtual machine is initialized
    • Xmx The maximum memory available to the Java virtual machine
    • XX: PermSize Memory permanent reserved area
    • XX:MaxPermSize Maximum permanent reserved area in memory
  • Configuration example:
  • JAVA_OPTS='-Xms1024m -Xmx2048m -XX: PermSize=256M -XX:MaxNewSize=256m -XX:MaxPermSize=256m'
  • Note: The memory configuration needs to be configured according to the actual memory of the server (or virtual machine)
  • Restart Tomcat to take effect
• Tomcat IO optimization
  • If necessary, you can use APR to solve asynchronous IO problems at the operating system level. Next, use NIO.
  • In server.xml
• Tomcat thread optimization
  • maxThreads="600" ///Maximum number of threads
  • minSpareThreads="100" ///Number of threads created during initialization
  • maxSpareThreads="500" ///Once the number of created threads exceeds this value, Tomcat will close the socket threads that are no longer needed.
  • acceptCount="700" //Specifies the number of requests that can be placed in the processing queue when all available threads for processing requests are used. Requests exceeding this number will not be processed
• Using thread pool
  • Add an executor node in server.xml, and then configure the executor properties of the connector.
  • namePrefix: The naming prefix of threads in the thread pool
  • maxThreads: The maximum number of threads in the thread pool
  • minSpareThreads: The minimum number of idle threads in the thread pool
  • maxIdleTime: When the minimum number of idle threads is exceeded, the remaining threads will wait for this length of time and then shut down.
  • threadPriority: thread priority

<Executor name="tomcatThreadPool" namePrefix="req-exec-"maxThreads="1000" minSpareThreads="50"maxIdleTime="60000"/>
<Connector port="8080" protocol="HTTP/1.1" executor="tomcatThreadPool"/>

• Disable DNS Lookups
  
  • When a web application wants to log client information, it will also log the client's IP address or convert the machine name into an IP address through a domain name server. DNS queries require network usage and may involve obtaining the corresponding IP addresses from many distant servers or inoperative servers, which can take a certain amount of time. In order to eliminate the impact of DNS queries on performance, we can turn off DNS queries by modifying the enableLookups parameter value in the server.xml file.
• Cache optimization
  
  • It is best to cache static pages so that they do not have to be read from disk every time. Here we use Nginx as the cache server to cache pictures, css, and js files, effectively reducing the access to the backend tomcat.
• Enable GZIP compression in Tomcat to improve web performance
  
  • Modify %TOMCAT_HOME%/conf/server.xml and revise the nodes as follows:
  • Disadvantages of GZIP. Compared with projects without GZIP, using GZIP will increase the pressure of server compression (CPU consumption) and client decompression, so the configuration requirements of the server are higher. In addition, compression also takes time. If you want to occupy less space and get a high compression ratio, you must sacrifice a longer time. On the contrary, if time is more precious and speed is required, then the compression ratio must be smaller, and of course it will take up more space (compression ratio = original content size/compressed size, the larger the compression ratio, the smaller the compressed package occupies after compression). This is the contradiction between physical space and time.
• Use nginx to create a cluster
  • JVM virtual machine tuning
  • Operating system tuning
  • For operating system optimization, it is to increase the available memory capacity as much as possible, improve the CPU frequency, ensure the read and write speed of the file system, etc.

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.