used memory

Linux command is our basic skills to use and maintain the Linux operating system, when you master the basic command, you can efficiently and quickly complete the task, the following commands are the common commands summarized by themselves, mainly

JVM Creation Object mechanism Java is an object-oriented language, and when we create objects, we probably just know that there is a new keyword, and then we create a good instance of it. But as a programmer, we should know what the JVM is doing

The Linux operating system contains a number of tools, all of which can help you manage your system. From simple file and directory tools to very complex security commands, there's not much that you can't do on Linux. Also, while normal desktop

MRTG memory monitoring problems ~ -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. I set up MRTG and want to monitor the memory ~ However, the result shows that the device cannot be

RedhatlinuxAS4 has fewer and fewer memory-Linux Enterprise applications-Linux server application information. For more information, see the following. First, the principle of memory usage in Linux is to "maximize the use of physical memory". During

The basic principle of Linux is that no resources should be wasted. therefore, the core uses as much RAM as possible to cache information from local and remote file systems. when the system performs read/write operations, data related to the

People seem to think that it is difficult to write a garbage collection mechanism. It is a deep magic that only a few wise men and Hans Boehm (et al) can understand. I think the most difficult part of garbage collection writing is memory allocation,

The Java. Lang. runtime class provides the java. Lang. runtime class to view the current JVM memory usage. Each Java instance (Virtual Machine instance) has only one runtime instance. You can use runtime. getruntime () to obtain the runtime Instance

The linux memory management commands vmstat-s and free-m are good memory observation commands www.2cto.com. The system is just running-bash-3.2 $ vmstat-s 30897940 total memory 184408 used memory 78848 active memory 67432 inactive memory 30713532

In Windows, users may encounter the following error message: "0x ???????? Instruction reference 0x00000000 memory, the memory cannot be written ", and then the application Program Disabled. If you ask some "experts", the answer is often "Windows is

    The top command is used to display the current process and other conditions of the system. It is a dynamic display process, that is, you can press the key to continuously refresh the current status, if the command is executed on the foreground,

The following describes how to use the top and free commands to view the free memory in the system. Therefore, if you run the top command, you can see [root @ linuxzgf ~]. # TopMem: 8174492 ktotal, 7124268 kused, does not mean that your application

The basic functions of the top command and ps command are the same, displaying the current process of the system and other conditions. However, the top command is a dynamic display process, that is, you can press the key to continuously refresh the

When linux memory is full or the usage mechanism is used up, it is often said that wdcp occupies a lot of memory, or the memory is used up, will it be suspended? You can say, don't worry, there will be no problem when it is used up, because it is

Deep understanding of Java Virtual Machine _ Chapter 2 _ Reading Notes and deep understanding of virtual machines 1. Contents of this chapter: Overview Data Area During Running Program counters Java Virtual Machine Stack Local method

Garbage collection in Jvm and Jvm garbage collection I. Concept of garbage collection Memory collection in Java is the memory collection during Jvm runtime. The areas to be recycled include the method area and Java heap. Because of program counters,

This article is from the "in-depth understanding of Java Virtual Machine," a book, it is very recommended that you look at this book. Other articles in this series:"In- Depth understanding of Java virtual machines" Java memory area model, object

Describes the 7 zones in the JVM, and then describes the scenarios in which each zone can cause a memory overflowProgram Counter: As the current thread doesbyte code line number indicator。 is a threadPrivateMemory, and the only piece does not report

System MonitoringTop Command : Displays the processes running on the system, which is one of the most important tools for system administrators, and is widely used to monitor the load on the serverThe top command displays a lot of information about

Installation details for MRTG under Linux (CentOS)MRTG is very powerful, he can control your server for a move, and web-style presented to you, to tell you the network, CPU, memory, hard plate and other uses, but the configuration of this software