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Tags: statistics impact receive process blog End Agent Dynamic AtimeA 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 "proces
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
Improve Linux operating system performance 2011-01-05 13:48 Anonymousfont Size:T | T This article explains in detail how to tune Linux system performance from disk, file and file system, memory and compilation. The tuning method provided in this article can improve the performance
[Linux] performance monitoring command vmstat and linux Command vmstatI. Overview
Monitoring is usually divided into machine monitoring and service monitoring. Machine Monitoring is the basic monitoring to obtain the current running status of the system. service monitoring is the main purpose and the most important monitoring, machine Monitoring also exists for b
Tool: linux performance monitoring tool-nmon, linux-nmon
Nmon download: http://pan.baidu.com/s/1jICoSpo
It can be run directly in linux.
The nmon tool can display all important performance optimization information on a single screen and dynamically update it.
The nmon
-20161109094220389-1085357049. PNG "style=" border:0px; "/>#安装之前首先保证你的系统最新$ sudo yum updatePlease note: The installation of LIS requires that your kernel is the latest version, so after the update, please restart the machine to ensure that the latest Linux kernel is loaded, or the subsequent installation will be error.#解压缩并安装LIS4$ TAR-XZVF lis-rpms-4.1.2-2.tar.gz$ sudo./inshall.shThere may be some warnings that can be ignored, and the machine needs to
Linux Performance Tuning Overview
-What is performance tuning? (What)-Why performance optimization? (Why)-When do I need performance optimization? (When)-Where do I need performance tuning? (Where)-Who will perform
We know that system optimization is a complex, tedious, and long-term task. the following subsystems are usually monitored: CPUMemoryIONetwork The following is a commonly used monitoring tool. Linux includes many subsystems (including CPU, Memory, IO, and Network). We know that system optimization is a complex, tedious, and long-term task. normally, the following subsystems are monitored:
CPUMemoryIO
Network
The following are common monitoring tools
ability to copy different size files in different buffer sizes, pipeline throughput, Process generation speed, system call overhead, and so on to test Linux -related performance. XbenchThe main test Xwindow graphical interface performance. IOzone File System Evaluation tool for read , write re-read Re-write read Backwards read strided,fread,fwrite,Ra
-bit system will have/lib64 and/lib two directories, 32 bits only/lib one.More ways:Http://www.blogjava.net/baizhihui19870626/articles/382202.htmlTo view CPU information:More/proc/cpuinfoThis whole bunch may not be able to read, an article: Linux cpuinfo Detailed:In a Linux system, how do you know more about CPU information? Of course it was checked by Cat/proc/cpuinfo, but how about several cores/threads,
We know that system optimization is a complex, tedious, and long-term task. The following are common subsystems for monitoring:CPUMemoryIO
Network
The following are common monitoring tools
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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
2018 07:59:21 PM PST6 ************************************************************************/7 8#include"head.h"9 using namespacestd;Ten One BOOLdaemonize () { A //creating a new process and exiting the parent process can cause the child process to run in the background -pid_t PID =fork (); - if(PID 0)return false; the Else if(PID >0) Exit (0); - - //Empty the file mask so that the newly created file permission is mode0777 -Umask0); + - //create a new session and set t
This article was compiled out of interest in the Linux operating system and a strong desire for underlying knowledge. This article can also be used as an indicator of basic knowledge, and the article covers all aspects of a system. If there is no perfect computer system knowledge, network knowledge and operating system knowledge, documentation tools, is impossible to fully grasp, in addition to the system performa
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
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
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
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
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
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
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