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In the analysis of the system, one of the first and most basic tools is often a simple measurement of the CPU utilization of the system. Linux and most unix-based operating systems provide a command to display the system's average load (loadaverage).
[huangc@v-02-01-00860 ~]$ uptime 11:18:05 up for days
, 1:17, one users, load average:0.20, 0.13, 0.12
Specifically, the average load value represents the average number of tasks that can be run with
multiple hard disks to form a large space.Partitioning is only marked on the hard disk, but not formatted as a file system, so the speed is fast.The faster the hard disk depends on the outside. [The smaller the Partition Number is, the more the disk depends on the outside area. Therefore, the larger the data volume, the first partition.]Program developers focus on the functional requirements of employers, and system administrators focus on program resource overhead.
Http://c.biancheng.net/cpp/html/2782.htmlLinux System Performance AnalysisThe purpose of this tutorial is to introduce a number of free system performance analysis tools (commands) that can be used to monitor the utilization of systems resources and to facilitate the detection of bottlenecks.The overall performance of the system depends on the balance of various
Talking about linux performance optimization 21: Analyzing the mail system talking about linux Performance Optimization 20: Module Management and Kernel Compilation http: www2ctocomos201308235094html mail application service can allow latency, not like web, databases have high real-time requirements and fast response.
Linux performance optimization 19: lvm advanced usage 18: linux Performance Optimization 18: lvm is recommended http://www.2cto.com/os/201307/231381.html The above section introduces the logical volume management technology. we all know that it has advantages over traditional disk management. here I have an article abo
Linux Performance Optimization 18: lvm is recommended. linux performance optimization 17: Process binding and interrupt binding http://www.2cto.com/os/201307/230782.html I saw a post in the forum a few days ago about 20 GB of space in the partition of the system/home managed by the administrator...
New Linux kernel 2.6.26 evaluation: Performance Improvement-general Linux technology-Linux programming and kernel information. For details, refer to the following section. A few weeks ago, Linux 2.6.26 kernel was released, which mainly improved kernel Virtual Machine support
Curl-loader Introduction
Curl-loader ( Also known as" Omes - Nik " And " Davilka " ) Yes An Open Source Of C Language Write Of Tools , Simulation Application Load And Tens of thousands Dozens Tens of thousands HTTP/ HTTPS and FTP / Ftps Client ApplicationProgram Of Action , Each Yes Its Own Source IP address . On the contrary, OthersCurl-loader Use True C Write Of Customer End Protocol Stack , That is Libcurl and TLS / OpenSSL SSL HT
The log file system can ensure the integrity of the overall data in the case of power failure or other system faults. Linux is one of the most supported operating systems, this article focuses on the common log file systems in Linux: ext3, reiserfs, XFS, and JFS log technologies, and tests them using standard test tools postmark and Bonnie ++, detailed performance
Once testing the performance of the distributed cluster system under the Linux system, using some test software, the company let me give the department colleague to do a basic training, and then look at the previous written records selected a few of them, the memory is not complete, only record the use of functions.1.IozoneIOzone is a file system benchmark tool that can test the read and write
System Performance analysis Tools
The above sections describe several aspects of how Linux performance is affected and how to solve them, but how do you find out from the system that something is wrong with a certain aspect or a few aspects, which requires the use of several common performance analysis tools provided
OptimizationL Cancel Debug Mode (18 pages)Nginx source code After decompression, modify the AUTO/CC/GCC file#debugCflags= "Gflags-g"Comment or delete these two lines, i.e. cancel debug modeL TcmallocRelated article: http://www.linuxidc.com/Linux/2013-04/83197.htmL nginx Kernel parameter optimization (21 pages)Related article: http://www.linuxidc.com/Linux/2013-04/83198.htm1.5 Building Nginx + Java Environm
The Uptime command of the Linux performance testing tool displays how long the server has been running, how many login users there are, and the overall load average evaluation of server performance ). The load average value records the number of processes waiting for execution in the queue for the last 1 minute, 5 minutes, and 15 minutes respectively ).
The main
Curl-loader IntroductionCurl-loader ( also known as "Omes-nik" and "Davilka") is an open source C language tool that simulates application load and tens of thousands of hundreds of thousands of of people with HTTP/ HTTPS and ftp/ FTPs The behavior of the client application, each with its own source IP address.Instead, the other curl-loader uses the real C-written client stack, the Libcurl and tls/ OpenSSL SSL http and FTP protocol stacks, which support the login and authentication flavors and to
Ext.: http://www.vpsee.com/2014/09/linux-performance-tools/There are a lot of performance tools on the Linux platform, a dazzling, long-term groping and experience finding the best thing to use is the proven, simple gadgets. Brendan D. Gregg, a system performance expert, upd
This article describes the performance testing of Linux comes with commands, detailing the use of these Linux-brought tools.First, uptimeThe results of the uptime command include how long the server has been running, how many logged-in users, and the overall evaluation of server performance (load average). The load ave
basic commands for viewing network performance in a Linux environment because Linux often uses a character interface, and Linux is more powerful, with default routing capabilities, which are equivalent to gateways and routers. The network performance is also relatively stabl
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Linux features are rich, powerful, and flexible. You can use it to complete various tasks. In this article, we will discuss some techniques to improve the performance of Linux servers.
1. Adjust the Linux kernel elevator Algorithm for disk I/O
After selecting a file system, some kernel and mount options may affect it
Metrics to measure CPU performance:1, the user uses the CPU situation;CPU runs regular user processesCPU Running niced ProcessCPU running real-time process2, the system uses CPU condition;For I/O Management: interrupts and drivesFor memory management: page swappingUser Process Management: Process start and context switch3,wio: The rate at which the process waits for disk I/O and the CPU is idle.4,CPU idle time, except for the above Wio5,cpu ratio used
From http://www.linuxidc.com/Linux/2012-06/63754.htmValgrind is commonly used to analyze program performance and memory leak errors in programsA Valgrind toolset CompanyValgrind contains the following tools:1, Memcheck: Check the program of memory problems, such as leakage, cross-border, illegal pointers and so on.2, Callgrind: Check the program code run time and call process, and analysis program
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