linux performance counters

1. Top The top command is a common performance analysis tool in Linux. It can display the resource usage of various processes in the system in real time, similar to the Windows Task Manager. Description: PID: process IDUser: process ownerPR: process priority. The smaller the value, the higher the execution priority.Ninice: ValueVirt: Virtual Memory occupied by processesRes: physical memory occupied by

Vmstat and Iostat are important two performance monitoring tools for Linux.Vmstat-Brief information on memory, processes, and paging Procs R indicates how many processes are waiting for the CPUb indicates how many processes are hibernating (usually means waiting for I/O such as disk, network, user input, etc.) MemorySWPD how many blocks are swapped out to diskFree How many pieces are idleBuff How many blocks are being used as buffersHow many b

Tags: ROM data test Rules collection notebook SEM disk read-write providerA Linux server Performance View 1.1 CPU Performance View 1, view the number of physical CPUs:cat /proc/cpuinfo |grep "physical id"|sort|uniq|wc -l2. View the number of cores in each physical CPU:cat /proc/cpuinfo |grep "cpu cores"|wc -l3, the number of logical CPUs:cat /proc/cpuinfo |grep "

free shared buffers cachedMem: 1016656 940168 76488 19384 114052 543612-/+ buffers/cache: 282504 734152Swap: 0 0 0You can see the total memory size, the memory used, and the remaining memory.Swap is a swap partition that can be understood as virtual memoryIostatIo is I/O, this command is used to output I/O-related data, input iostat-xLinux3.10.0-123.9.3. el7.x86_64 (IZ28YQVMJKRZ)Geneva/ -/ ._x86_64_(1CPU) Avg-cpu

device file that displays the information.Development qixoo.comlsof commandCommand functionThe lsof command is used to display a list of all files that are currently open on the Linux system.Command syntaxLsof (option)Option description-C: Displays a list of files opened with instructions that begin with the specified character.Fuser commandCommand functionThe Fuser command is used to report the files and network sockets used by the process.Command s

Linux Performance View Commands: Linux Performance monitoring: CPU Chapter CPU usage depends largely on what resources are running on the CPU, such as copying a file that usually takes up less CPU, because most of the work is done by DMA (Direct Memory Access), but only after the copy has been completed. Let the CPU k

4 ways to accelerate network applications Using the Sockets API, we can develop client and server applications that can communicate on the local network or on a global scale over the Internet. As with other APIs, you can use the Sockets API in a number of ways to improve the performance of the socket or to limit the performance of the socket. This article explores 4 ways to use the Sockets API to get the ma

The following chapters are a detailed introduction to Oprofile, interested in children's shoes can continue to read, these chapters are selected from the oprofile of the use of the guide, to understand the Oprofile analysis principles and scope of application is very helpful, is a bit boring: ( In this section, we discuss the core-opcontrol configuration of Oprofile analysis system in depth. Opcontrol script (Note that it is not an executable program OH) There is a default configuration, use t

Article Title: Linux-based Web server performance testing. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Abstract: Linux, as a free op

Performance Optimization of lamp (Linux + Apache + MySQL + PHP) servers Contributed by jieshiwang, Cao jianghuaSource: http://www.ccw.com.cn/server/yyjq/htm2006/20060627_193322.htm Currently lamp (Linux + Apache + MySQL + PHP) It has developed rapidly in recent years and has become a de facto standard for Web servers. The term lamp first came from the German mag

According to the tradition, parameters and settings of different Linux distributions and kernels have been changed, so that the system can achieve better performance. The following section describes how to use the following techniques to optimize performance in Red Hat Enterprise Linux AS and suse

Article title: improve socket performance on Linux-accelerate network applications. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. When developing a socket application, the first t

that applications can be downloaded for free, so that more people can use the software without paying. This free method is especially attractive to users. If these users do not use free software, they need to pay for "professional" commercial software tools. This is usually an expensive step in website creation. The FOSS license is open, so there are very few use and restrictions on Application Software Based on the FOSS technology. You can develop and apply lamp-based projects without having t

Source: http://www.linuxfly.org/post/114/[Go] Understanding Linux PerformanceThe project often encounters the need to perform an efficiency analysis of the systems currently in operation, or to meet customer inquiries to optimize the efficiency of the system. More often, in the event of a system problem, you need to analyze the cause, locate the system failure or bottleneck, of course, it is best to resolve the fault together. But in fact, operating s