java thread dump analyzer

One: JstackSyntax format for jstack command: Jstack 1. Different Java Virtual machine thread dump creation method and file format is not the same, different JVM version, dump information also differs. In this article, just take Sun's hotspot JVM 5.0_06 as an example.2. In the actual operation, often a

Transferred from: http://jameswxx.iteye.com/blog/1041173One: JstackSyntax format for jstack command: Jstack 1. Different Java Virtual machine thread dump creation method and file format is not the same, different JVM version, dump information also differs. In this article, just take Sun's hotspot JVM 5.0_06 as an examp

displayed locally.Double click on any node under local, see the change on the right, you can monitor the CPU, memory, class, thread and other health, real-time monitoring server performance.Right click VISUALVM we can see Thread dump, Heap dumpDo Thread Dump, and soon you'l

====2016/5/20:The thread stack of the server that requires Mr to be intercepted for Mr Performance tuning (thread Dump)Comrade-in-arms introduced the method is this:①, using the PS command "PS-EF | grep java "Filters out all Java processes (after all, MapReduce is running in

[2015/08/25 20:50:13.254] {threadlauncher2[threadpool[system]]-1} Thread Dump generated Tue 20:50:13 CST "Attac H Listener "Id=4 RUNNABLE "Threadlauncher2[threadpool[system]]-1" id=10 RUNNABLE

, 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 exhausted. This type of error may not be rela

One, install Eclipse Memory AnalyzerFind the address of the update site at Memory Analyzer's website:Then: In the Eclipse interface--->help--->install New software--->add--->add reposity, and in location enter: Update Site address, you can install.Two, raw piles dump fileThis generates a heap dump file using the Jmap command.Ctrl+alt+delete open Windows Task Manager, click: Process---> Find the PID of the c

About 5 things you don't know about Java performance Monitoring-part 2nd: Java process monitoring with JDK built-in analyzer Fully functional built-in analyzers, such as Jconsole and VISUALVM, are sometimes more expensive than their performance costs-especially in systems running on production software. So, in the 2nd article focusing on

data structure views to help you track changes in memory consumption while revising bugs, adding or removing new features. MDD4J can be obtained through IBM Support Assistant. Because memory heap analysis consumes a large amount of processor and I/O resources, you can also run it outside of the IBM Support Assistant Workbench. Performing memory heap analysis on a server class machine--especially 64-bit machines--allows you to handle an infinite amount of memory heap and reserve a large amount

first, what is Jconsole? Jconsole has been introduced from Java 5. Jconsole is a built-in Java performance Analyzer that can be run from the command line or in a GUI shell. You can easily use Jconsole (or, perhaps, its more high-end "close cousin" VISUALVM) to monitor Java application performance and track code in

Here, we use the memory analyzer tool of eclipse to achieve Intelligent Analysis convenience. Download and install the tool first. We will equip the memory material below, starting from a simple one. Suppose there is a class that does not contain other information about the task. It is null: public class Node{}Then there is a mail function public class Main{public static void main(String[] args){Node n = new Node();}}Run the program and obtain a memor

#背景提要It's been a long time since you deployed the code yourself, and the command line's intimacy is getting lower. Released the keyboard, accustomed to the mouse operation of the Windows environment. Sudden practical deployment is also good.Often at the time of deployment, OPS students are blind to [hs_err_pid] files. As everyone knows, this is the Java Virtual machine crash log.#这次是如何分析问题的? First, viewLog Header file## A fatal error has been detected

Test program Public classHeapoom {Private Static inti = 0; Static classOomobject {} Public Static voidMain (string[] args) {ListNewArraylist(); Try { while(true) {List.add (Newoomobject ()); I++; } } finally { //810325System.out.println (i); } }}Output:[GC (Allocation Failure) 5142k->3031k (19968K), 0.0070246secs] [GC (Allocation Failure) 8663K->7062k (19968K), 0.0066110secs] [GC (Allocation Failure) 12694K->12708k (19968K), 0.0091115secs] [Full GC (ergonomics) 1

. Newsinglethreadexecutor caused by the deadlock Because Newsinglethreadexecutor creates a single thread, the tasks are executed serially, and if dependencies between tasks arise, deadlocks can occur easily. Here's an example of a newsinglethreadexecutor deadlock. /** * * @author Xiaosuda * @date 2018/1/8/public class Singlethreadexecutortest {public static void main (Stri ng [] args) throws Executionexception, interruptedexception {executorservice si

information: "pool-4-thread-21" prio=6 tid=0x000000000d662800 nid=0x2364 waiting on condition [0x000000001175f000] java.lang.Thread.State: WAITING (parking)at sun.misc.Unsafe.park(Native Method)- parking to wait for The preceding figure shows the stack information of about 100 threads. Only two stacks are listed here. For details about the stack information analysis of virtual machines, refer to the article: "three instances demonstrate

Jstack.exe program, you can help users view thread status.How to use:1 query Thread PID2 input jstack-l pid in cmdC:\users\administrator>jstack-l 50282015-04-01 17:43:30Full thread dump Java HotSpot (TM) Client VM (24.60-b09 mixed mode, sharing):"

through VISUALVM, you can view the thread information of the JVM through the Threads tab, VISUALVM the thread status as follows:Through the dump thread stack, and corresponding to the thread name in the VISUALVM monitoring information, find the VISUALVM