memory analyzer

Transferred from Http://www.cnblogs.com/nb44c/p/5218880.html Looking deep into the JVM virtual machine book (p50,2.4 combat OutOfMemoryError), there is an example of a Java heap overflow, using the Eclipse Memory Analyzer plug-in, because it is now using MyEclipse, So you need to add plug-ins on the MyEclipse. The concrete steps are as follows: 1. Install the mat plugin first

Turn from HTTP://WWW.CNBLOGS.COM/NB44C/P/5218880.HTML1. Install the mat plugin first Memory Analyzer Plugin: http://www.eclipse.org/mat/downloads.php Click to download 3. Extract the downloaded files to the MyEclipse Dropins folder4. Create a. link file with the same name as the folder, and write the corresponding address in the file (address using \ \ or/)5. Restart MyEclipse to see the

ObjectiveIn the ordinary course of work, sometimes encounter outofmemoryerror, we know that encountered error generally indicates that the program has a serious problem, may be catastrophic. So it is very important to find out what causes outofmemoryerror. Now we introduce the Eclipse Memory Analyzer tool (MAT) to resolve the challenges we face. If not stated, this article uses the Java 5.0 on Windows XP SP

Eclipse memory Analyze is a Java heap dump file analysis tool that can help you to identify and reduce memory vulnerabilities.OverviewFor large JAVA applications, fine testing is also hard to block all vulnerabilities, even though we have done a lot of good work during the testing phase, many problems are exposed in the production environment and are difficult to reproduce in a test environment. The JVM is

instance. Org.rosenjiang.bo.Pilot class headlines, was instantiated 290,325 times, and then returned to see the program, I admit it was deliberately done. There are a number of useful reports that can be used to assist in analyzing problems, but the examples in this article are too simple to use.To learn more about the function of mat, give some examples (do not provide the corresponding code):Example two:When the heap dump problem is discovered through mat, you need to look for the code point

Tags: targe date application Open Source Tool appears new tail program statusReprint: http://blog.csdn.net/lindir/article/details/87436102 months did not write a blog, recently has been considering their future direction, coupled with the project is relatively tight, has not been updated. Today I want to work hard and make up for the unfinished homework last year.工欲善其事 its prerequisite, start updating eclipse, and install the tool software. So briefly write how to install

.hprof) before and after operation, open with mat and get Histgram result6. Use the homepage field to filter the Histgram results and list the object instances of the class, and see that the collection of objects in the two tables is different in size, with one more homepage than before the operation, indicating there is a leak7. Compare the two lists to find an extra object and find out who strung the reference line, locating it, using the method of finding GC root.Ps:· A lot of times the heap

工欲善其事 its prerequisite, start updating eclipse, and install the tool software. So briefly write how to install memory Analyzer from scratchMemory Analyzer (Eclipse MAT) is a cross-platform, open-source tool that can be used not only to analyze the problems of the RAM, but also to monitor the state and behavior of the entire Java application. By reading the snapsh

Original: http://blog.csdn.net/rachel_luo/article/details/8990202 Preface In the ordinary course of work, sometimes encounter outofmemoryerror, we know that encountered error generally indicates that the program has a serious problem, may be catastrophic. So it is very important to find out what causes outofmemoryerror. Now we introduce the Eclipse Memory Analyzer tool (MAT) to resolve the challenges we fa

Memory analyzer can be used to analyze the state of the RAM usage, which is often used when a memory overflow occurs.First step: Download Eclipse MAT: http://www.eclipse.org/mat/downloads.phpThe second step: after downloading the compressed package decompression, placed in the MyEclipse myeclipse\myeclipse 10\dropins directoryCreate a mat folder where the extract

Introduction: Eclipse Memory Analyzer (MAT) is one of the 33 components of the Eclipse Galileo version of the famous Cross-platform integrated development environment, a feature-rich JAVA heap dump file analysis tool that can help you discover memory vulnerabilities and reduce memory dissipation Consumption. This artic

Tags: com href log data ref own Source view HTTPSReprint: http://www.jianshu.com/p/3b3c3a9147241.:eclipse Memory Analyzer Open Source Project2. Click on the download page to download the appropriate version3. Select a mirror site closer to you to download4. The download result is a ZIP package, which can be run directly after decompression.Note: Mat actually has two forms, one is the independent mat (stand-

, for example: The application may be in the calculation of the size of the array, there is an algorithm error, resulting in a large array size, resulting in a large array is allocated.5. OOM for small swap=> example: Exception in Thread "main": Java.lang.OutOfMemoryError:request AnalysisThis type of error is thrown due to a failure to allocate memory from the native heap, and the heap memory may be nearly

I. Installing the memory Analyzer ToolOpen Eclipse >> help >> Install New software >> Click the Add on the right side of work, enter[Name] Mat[location] http://archive.eclipse.org/mat/1.2/update-site/ Click OK >> Click Select All under the Install window, then continue to the next step until the end.Two. Using Memory AnalyzerCreate a Java project (just one Cla

Write a code that can make a heap overflow first PackageCom.test.jvm.oom;Importjava.util.ArrayList;Importjava.util.List;/*** @date September 21, 2017 * @Description: VM Args:-xms20m-xmx20m-xx:+heapdumponoutofmemoryerror*/ Public classHeapoom {Static classOomobject {} Public Static voidMain (string[] args) {ListNewArraylist(); while(true) {List.add (Newoomobject ()); } }}The run-time parameters are as followsThe operation results are as followsAt this point, the Hprof file appears under the p

) 14711k->14691k (19840K), 0.0588749 Secs]java.lang.outofmemoryerror:java heap spacedumping Heap To Java_pid4352.hprof ... Heap dump file created [26506297 bytes in 0.267 secs]Description: The heap footprint before recycling and the amount of garbage collected (heap space size) is the last time (in seconds) .Analysis of memory leaks Storage Analyzer plug-in installationFirst, open Eclipse->help->install new

This article mainly introduces the example of using MELIAE to analyze program memory usage in Python. This article provides sample code. if you need a friend, you can refer to the dht protocol search program written below, I optimized these days and found that the speed is indeed much faster. But there was a new problem, and the memory soared. I opened ten crawlers that occupied 800 MB of

1, monitoring purposes2. Common analysis Tools3, Analysis case-matMAT Introduction and Analysis:Start the mat and select the menu item File-open heap dump to load the heap dump file that needs to be parsed. After the file is loaded, you can see the interface shown in 1:From Figure 1, you can see most of his features:? Histogram can list objects in memory, number and size of objects? Dominator Tree can list which threads and which objects the thread is

classes. In addition, there are duplicate classes functions, but also to assist in the analysis of repeated loading of the class, here is no longer, it is certain that Myabsclass was repeatedly loaded n times. Last In fact, the mat tool is very powerful, the above-mentioned example code does not use the other MAT analysis function, so it is no longer described. In fact, for Oom not only I enumerated two kinds of overflow errors, there are a number of other errors, but I want to say, for P