jvm performance monitoring

this area is mainly for the recovery of constant pool and unloading of type, in general, the recovery of this area "score" is very difficult to be satisfactory, especially the type of unloading, the condition is very harsh, but this part of the area of the recovery is really necessary.　　Instead, run a constant pool as part of the method area. class file In addition to the class version, fields, methods, interfaces, and other descriptive information, there is also a constant pool, for the compil

All the content in this article is based on JDK 5, which may be different if JDK 6 is used.In the past few days, we have done some performance monitoring work, some of which are worth recording:JDK itself provides many tools based on command lines and guis. It is very useful to learn to apply them rationally.Jmap is a command line program that is used to view the number of objects in the

Java process ID of the configuration information to be printed and can be queried with JPS.4. Examples of UseFirst, JSTATDStart the JVM monitoring service. It is an RMI-based application that provides information about native JVM applications to remote machines. Default Port 1099.Example: Jstatd-j-djava.security.policy=my.policyThe My.policy file needs to be bui

Http://www.cnblogs.com/xrq730/p/4842483.htmlObjectiveWhen locating system problems, knowledge, experience is the basis, data is the basis, tools are the means of using knowledge to process data. The data mentioned here are: Run log, exception stack, GC log, thread snapshot, heap dump snapshot, and so on. Frequent use of the appropriate tools for virtual machine monitoring and analysis can speed up the analysis of data and pinpoint problem resolution.J

ObjectiveWhen locating system problems, knowledge, experience is the basis, data is the basis, tools are the means of using knowledge to process data. The data mentioned here are: Run log, exception stack, GC log, thread snapshot, heap dump snapshot, and so on. Frequent use of the appropriate tools for virtual machine monitoring and analysis can speed up the analysis of data and pinpoint problem resolution.JPS: Virtual Machine Process Health toolFirst

Introduction: Most of the services are running on Linux, Linux is now a very wide range of applications, but there will still be a lot of problems, we will discuss our performance monitoring metrics, performance monitoring is nothing more than I/O, memory, cpu,tcp connection number, network, Process or thread to start,

VISUALVM is a free, integrated visualization tool that integrates multiple JDK command-line tools to provide you with powerful analytical capabilities for performance analysis and tuning of Java applications. These features include generating and analyzing massive amounts of data, tracking memory leaks, monitoring the garbage collector, performing memory and CPU analysis, and it also supports browsing and m

queue.%UTIL:I/O requests account for the percentage of the CPU, the higher the ratio, the more saturated the description.1. When the value of Avgqu-sz is low, the equipment utilization is higher.2. When the value of%util is close to 1%, it indicates that the device bandwidth is already fullTo determine the system bottleneck, it is sometimes necessary to combine several SAR command options.Suspected CPU bottlenecks, sar-u and sar-q can be used to viewSuspect memory bottlenecks and can be viewed

schedule for a chart of active objects and arrays. Recorded production Recorded throughputDisplays the cumulative schedule of activities for the JVM to be produced and released over time. Garbage collection Activities GC activityDisplays an activity schedule for the garbage collection activity. Class ClassesDisplays the active timesheet for a chart with the loaded class. Thread ThreadsDisplays an activity schedule with a dynamic t

Introduction A few days ago, w3ctech's entry into the famous enterprise-Baidu frontend Fex session once said that he could build his own front-end performance monitoring system seven days after listening to the lecture. Since he said it, he could not give up. In the previous article, the beauty of front-end data I believe everyone has a certain understanding of front-end data. The following describes the

http://os.51cto.com/art/201412/460698_all.htm2014-12-19 10:55 Translator: Andyxue linux Chinese font size:T | T In this article we will list a series of the most frequently used performance monitoring tools, and provide a corresponding introduction link to each of the tools introduced, roughly divided into two categories, based on the command line and provide graphical interface.Ad:51cto Net + 12th salon: T

.pptxWhy does performance affect the company's earnings? The root cause is also that performance affects the user experience. Loading delays, operation Lag, and so on will affect the user experience. In particular, mobile users have low tolerance for page response delays and connection interruptions. Imagine you're holding a cell phone. To open a webpage to see a message but load a half-day mood, you probab

IntroductionBefore the W3ctech into the name enterprise-Baidu front-end FEX "bombast" said that after seven days after the lecture can build their own front-end performance monitoring system, since said out of can not promise. The beauty of front-end data in a previous article believe that we have a certain understanding of the front-end data, the following is a detailed description of the

Monitoring indicators Metrics that typically require monitoring for performance testing include: 1. Server Linux (including CPU, Memory, Load, I/O). 2. Database: 1. Mysql 2.Oracle (Cache hit, index, single SQL performance, database [/url] threads, number of data pool connections). 3. Middleware: 1. Jboss 2. Apache (inc

lets you monitor and manage Java applications and virtual machines On a local or remote machine.On Windows, the jconsole command does isn't associate with a console window. It does, however, display a dialog box with error information when the jconsole command fails.Options -interval =n Sets the update interval to n seconds (default is 4 seconds). -notile Does not tiles windows initially (for-or more connections).

Before you start About this series Writing code for an application is just the first phase of a lengthy process required to deliver a robust product quality program. The code must be tested to verify its operation and accuracy. It is also often necessary to analyze the code to eliminate performance bottlenecks and resource waste (especially memory). Code must also be monitored to locate faults, identify usage patterns, look for opportunities for fur

lets you monitor and manage Java applications and virtual machines On a local or remote machine.On Windows, the jconsole command does isn't associate with a console window. It does, however, display a dialog box with error information when the jconsole command fails.Options -interval =n Sets the update interval to n seconds (default is 4 seconds). -notile Does not tiles windows initially (for-or more connections).

Daily monitoring and debugging of Linux system performance is a heavy task for the system and network administrators. Five years after working as a Linux system administrator in the IT field, I gradually realized how difficult IT is to monitor and keep the system up and running. For this reason, we have compiled the list of 18 most commonly used command line tools that will help every Linux/Unix system admi

Daily monitoring and debugging of Linux system performance is a heavy task for the system and network administrators. Five years after working as a Linux system administrator in the IT field, I gradually realized how difficult IT is to monitor and keep the system up and running. For this reason, we have compiled the list of 18 most commonly used command line tools that will help every Linux/Unix system admi

Daily monitoring and debugging of Linux system performance is a heavy task for the system and network administrators. Five years after working as a Linux system administrator in the IT field, I gradually realized how difficult IT is to monitor and keep the system up and running. For this reason, we have compiled the list of 18 most commonly used command line tools that will help every Linux/Unix system admi