java memory profiling tools

In this series of tutorials, you'll take a look at the mysteries of Java memory leaks and teach the reader relevant analytical methods. Here is a case. Recently, there is a server, often running when there is an overload of the phenomenon of downtime. This issue still occurs after you restart the script and the system. Despite the large amount of data loss, the problem is not serious because it is not a cri

Poptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Poptest's LoadRunner training, in order to improve the students ' performance optimization experience, added language and server optimization knowledge, for performance tuning ability to lay the foundation. (You are interested in

Java.lang.Class instance, loading this type of ClassLoader instance, any one or more of the three is reachable state, Then this type cannot be uninstalled.The 8 JMX protocol provides a corresponding API interface for querying the memory usage and type loading information of the current virtual machine instance at run time. This is also the basis for many Java performance monitoring and analysis

column, ordinal, meaningless second column, number of object instances third column, object instance occupies total memory, unit: Byte fourth, last row of object instance name, total number of instances and total memory consumptionAlso, part of the example shows (not yet understood, subsequent additions): [C,[b,[i,[j,[l, using Jstat to view Java

sectionEnd of Content sectionMedium: First column, ordinal. Meaningless second column, number of object instances in the third column, the object instance occupies the total amount of memory. Units: Bytes column Fourth, object instance name last line, total number of instances and total memory consumptionAlso, part of the Demo sample description (not yet clear, perhaps supplemented): [C. B [I,[j,[l, using

Java PreparedStatement solution for Memory leakage, preparedstatement Recently I used java to write a database program and found that memory overflow always occurs after a period of operation. I want to use the memory monitoring tool to check the

java.lang.OutOfMemoryError: Java heap space at com.jvm.exception.HeapSpaceException.main(HeapSpaceException.java:13) In the memory, the system first prompts an OutOfMemoryError to upgrade the Java heap space. ? Generally, Memory analysis tools such as Eclipse

A lot of information on the web when describing the Java memory model, will introduce a main memory, and then each worker thread has its own working memory. The data is in main memory and there is a copy in the working RAM. There is a variety of atomic operations between wor

Ctrl + break to obtain the current memory dump information. Java-xmx1024m ....-XX: + heapdumponctrlbreak......Obtain with tools This is my commonly used method, through JDK comes some gadgets, you can refer to the http://blog.romebuilder.com/2011/06/393/ JPS and jmap are used here. Get the Java Process PID through JPS

Starting with Java 5, the JDK provides some API for JVM detection, which is known as the Java.lang.management package, which provides many Mxbean interface classes that can be easily retrieved to the JVM's memory, GC, Thread, lock, class, Even the operating system level of various information, this article is a simple introduction of the use of JMX on the Java pr

Remote monitoring of jboss application java memory configuration (actual test) Preface This is because a Java memory overflow problem occurs when the last project is deployed on the client side for about a month. to constantly monitor the java

CPU is going to execute itself, where should it start? So in the JVM memory structure, there should be a zone a, and the a zone should be the exclusive area of each thread.Second: Whether it is the code we write, or the use of third-party tools, it is necessary to load the class loader, which indicates that there should be a region B dedicated to store this information, such as compiled classes, methods, c

Is there a memory leak in Java? Yes. While some people say that this is inaccurate, in C + + programs, the memory that is opened up by the current process but not logically managed by the current process is called memory that is leaked by the process. In fact, Java will also

numerous options for detailed viewing of the usage of each part of the heap and the number of load classes. When used, you need to add the process ID of the view process, and the selected parameters. Execute:cd $JAVA _home/bin execute jstat, note Jstat must follow the parameters. jstatnbsp: monitoring VM memory usage. jstat tools are particularly powerful