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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,
Jvm performance monitoring and common tools, common tools for jvm monitoring
Common JDK command line tools
Jps: jps [options] [hostid].-q only displays the jvmid,-m parameter pas
Seven killer open-source monitoring tools
Do you want to have a clearer understanding of your network? There are no more useful tools than these free tools.
Network and system monitoring
If you are unfamiliar with the six open-source system monitoring tools, you are advised to refer to the relevant technical documents.1. Nagiox-network monitoring software
Nagios is well-known and undoubtedly the best system monitoring
Guide
Linux has very powerful capabilities in network and system monitoring, and offers a range of solutions that track the performance of these systems and devices and provide trending performance analysis. When some problems occur, you can call the police. While some tools can trigger some actions in the alarm, here, organized and collected some open
software is a powerful drawing engine, and many languages can call rrdtool for drawing.
(Round robin database ):
Official Address: http://oss.oetiker.ch/rrdtool/
Some database tools created by Tobi Oetiker. He is also designed to process time series data such as bandwidth, temperature, CPU load, etc. This data is stored in some column databases, so the system storage footprint is sufficient to continue
Advantages: 1. rrdtool is a data recorder with e
Tsar is a collection of information on the server system and application of the collection reporting tools, such as the collection of server System information (CPU,MEM, etc.), as well as application data (Nginx, Swift, etc.), the collected data stored on the server disk, can always query historical information, Data can also be sent to the Nagios alarm.
Tsar can be more convenient to add modules, only need to follow the requirements of Tsar to write
Chapter 8 JVM performance monitoring and troubleshooting tools (2), jvm troubleshooting
Note: This blog is mainly recorded in "deep understanding of Java Virtual Machine (version 2)"
Note: For details about JVM performance monitoring
Oom?Java.lang.OutOfMemoryError:java head space heap memory overflowJava.lang.OutOfMemoryError:Permgen Space Java Eternal Overflow, that is, methods to overflow, generally because of the emergence of a large number of classes and JSPs, or the use of Cglib reflection mechanism,This can be resolved by changing the size of the method area and modifying it in the form of a similar-xx:permsize=64m-xx:maxpermsize=256m. In addition, too many constants, especially strings, can cause the method area to ov
1, Jdb (the Java debuger)JDB is used to debug core files and running Java processes in real-time, with rich commands to help you debug, and its functionality is very similar to the DBX in Sun Studio, but JDB is specifically designed for Java applications.Now it should be said that the daily development of the jdb is seldom used, because now the IDE has been packaged for us, such as the use of Eclipse Invoke program is very convenient, as long as in very specific circumstances may use this comman
The JDK itself provides many convenient JVM performance tuning monitoring tools, in addition to the integrated VISUALVM and Jconsole, there are JPS, Jstack, Jmap, Jhat, Jstat and other small tools, this blog hope to play a useful, Let's start to understand the common tools f
Overview
When the system bugs need to locate the problem, knowledge, experience is the key foundation, the data is the basis, the tool is the use of knowledge processing data means. The data mentioned here include: Run log, exception stack, GC log, thread snapshot (threaddump/javacore file), heap dump Snapshot (heapdump/hprof file), etc. Using the appropriate virtual machine monitoring and analysis tools c
In addition to the integrated VISUALVM and Jconsole, the JVM also has small tools such as JPS, Jstack, Jmap, Jhat, Jstat, etc.Problems that may be encountered in development
OutOfMemoryError, Low memory
Memory leaks
Thread deadlock
Lock contention (lock contention)
The Java process consumes too much CPU
These problems may be overlooked by many people in their daily development
to the information currently crawled to further analysisSecond, JVISUALVMThe JDK comes with a JVISUALVM tool, which is used to monitor the CPU, memory, thread, and so on of the Java Runtime program. and monitor Java programs in a graphical way with remote monitoring capabilities.Pre-preparation1, upload tomcat to the virtual machine, WebApps under the existence of Prefteach package2, monitoring the
In addition to the integrated VISUALVM and Jconsole, the JDK itself provides performance tuning monitoring tools such as JPS, Jstack, Jmap, Jhat, and Jstat.In Java development, we sometimes encounter the following problems:OutOfMemoryError, Low memoryMemory leaksThread deadlockLock contention (lock contention)The Java process consumes too much CPU......These problems may be overlooked by many people in thei
JVM Introduction to Monitoring ToolsVISUALVM is a visual tool that integrates multiple JDK command-line tools to provide you with powerful analytical capabilities. All of this is free! The command-line tools It includes are jps,jstat,jmap,jinfo,jstack,jconsole, which are consistent with the standard version of the JDK.
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