jvm performance monitoring

Open Source Server monitoring tool-javamelodyJavamelody It can monitor Java or Java EE application servers and graphically display: Java memory and Java CPU usage, number of user sessions, number of JDBC connections, and HTTP requests, SQL requests, The number of execution of JSP pages and business interface methods (EJB3, Spring, Guice), average execution time, error percentage, and so on. Charts can be viewed by day, week, month, year, or custom tim

, generate a memory dump snapshot (heapdump file) of the virtual machine.5) JHAT:JVM Heap Dump Browser, which parses the Headdump file, establishes a http/html server that allows the user to view the results of the analysis on the browser6) Jstack:stack Trace for Java to generate a thread snapshot of the current moment of the virtual machine2. Visualization Tools1. Jconsle2. JVISULAVMRemote connection needs to be set for Java opt to use, see: http://www.cnblogs.com/Jtianlin/p/5021540.htmlJVM (4)

)Three use Jconsole monitor the running state1. We plan to set the total of the heap too small to 20M, the new generation and the old age of 10M. Because Survivor and Eden have a space ratio of 1:8 by default, Eden is about 8m,2 survivor each 1M. The following verifies that Jconsole's monitoring is consistent with our plans.(1) Total size of the heap:(2) Old age Size:(3) Eden Size:(4) Survivor size:Result: The expected plan was met.2. Other informatio

JDK itself comes with a lot of practical tools. The following are commonly used:1. JPs: displays all Virtual Machine Processes-Q: only ID numbers are listed.-M: ID, primary class, and parameters passed to the primary class-L: ID and full name of the main class-V: ID, primary class, and complete VM startup parameters 2. jstat: Virtual Machine statistics monitoring Reference: http://blog.163.com/yangshuo_qq/blog/static/2554680201272871350110/Jstat-GC

JVM monitoring tools-Introduction to several common tools and jvm monitoring-common toolsIntroduction to JVM monitoring tools Jdk provides a powerful GUI-based jvm

. port = 9008-DCOM. sun. management. jmxremote. authenticate = false-DCOM. sun. management. jmxremote. SSL = false Access java_opts = '-xms128m-xmx256m-XX: maxpermsize = 128 M-djava. RMI. server. hostname = 192.168.1.8-DCOM. sun. management. jmxremote. port = 8088-DCOM. sun. management. jmxremote. SSL = false-DCOM. sun. management. jmxremote. authenticate = true-DCOM. sun. management. jmxremote. password. file =/usr/Java/default/JRE/lib/management/jmxremote. password-DCOM. sun. management. jmxr

When we found in the IDE console:The value of the persistent generation set for the JVM is too small, you need to open the window->preferences->java->installed JRE in Eclispe, click the Edit button on the right, and the default VM Arguments option, increase the value of-xx:permsize and-xx:maxpermsize.If you understand JVM performance tuning, you can learn about t

Java applications are running on the JVM, but do you know anything about JVM technology? This article (the first part of the series) describes how classic Java virtual machines work, such as: the pros and cons of Java authoring once, Cross-platform engines, garbage collection basics, classic GC algorithms, and compiler optimizations. The following article will talk about