linux performance counters

, Context switch, run queue, CPU utilization.Bottom linePrevious Linux Performance monitoring: the introduction of performance monitoring before the need to know the bottom line, then monitor the CPU performance of the bottom line is what? Usually we expect our system to reach the following goals: CPU utilizat

Use Dstat for Linux Comprehensive Performance Diagnosis Performance testing, evaluation, and optimization have always been the focus of system management and maintenance personnel. When we analyze a production application, obtaining basic data such as CPU, memory, IO, network throughput, and process load is crucial for subsequent

3.3 memory bottleneckOn a Linux system, using programs run at the same time.These programs support multiple users, and some processes are more used than others.Some of these programs use a portion of memory while the rest are "sleeping ."When an application accesses cache, the performance increases because an in-memory access retrieves data,Thereby eliminating the need to access slower disks.In a

In previous posts on vm.swappiness and using RAM disks we talked about how the memory on a Linux guest are used for the OS itself (the kernel, buffers, etc), applications, and also for file cache. File caching is an important performance improvement, and read caching are a clear win in most cases, balanced against APPL Ications using the RAM directly. Write caching is trickier. The

 CPU performance Explore-linux cache mechanismBefore reading the article, you should have basic knowledge of the memory hierarchy, at least to understand the principle of locality. To learn more about the cache fundamentals, you can refer to this book, "in-depth understanding of computer systems" in the Memory Architecture chapter:With questions to read the article, the cache is not visible to programmers

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

Linux performance tuning 5: tuning an important role in soft raid storage. RAID independent redundant disk arrays are classified into two types: raid card-based hard raid (hardware implementation, high speed, suitable for large applications), system-based soft raid (generally included in the kernel, performance is not as good as hard...

occasionally more than 4 o'clock, generally does not affect the performance of the system.If the output value of load average is less than the number of CPUs, the CPU is more idle.Second, the system CPU1. Viewing system CPU UsageTop2.CPU usage Analysis%CPU (s): 6.0 us, 0.5 sy, 0.0 ni, 92.4 ID, 1.1 wa, 0.0 hi, 0.0 si, 0.0thUS: Indicates the percentage of time that the CPU is in user modeSy: Indicates the percentage of time that the CPU is in system mo

Linux performance testing and monitoring sar commands. Linux performance testing and monitoring sar Command sar (SystemActivityReporter system activity report) is currently one of the most comprehensive system performance analysis tools in

Portability testing for operating systems: evaluation tools are written in C language and have good portability although they are easier to be compiled by GCC ). This is useful for generating detailed comparison results between systems.1. Main Features of Linux Performance Testing Tool Lmbench A) portability testing of the Operating System: The evaluation tools are compiled in C language and have good porta

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.

implemented according to the callback function on each FD, only the active socket will actively invoke callback, so in the case of less active sockets, using Epoll does not have a performance problem with the linear descent of the preceding two. However, when all sockets are active, there may be performance issues. 3. Message Delivery method Select The kernel needs to pass t

Talking about linux performance tuning 9: changing system default limits; talking about linux performance tuning 8: Removing unnecessary overhead http://www.2cto.com/os/201307/228393.html After reading the first two articles, we are trying to save resources for our real services. Problem: our service is actually used..

Linux performance monitoring and analysis tool background recently, a pre-developed system performance test is required. The system is deployed on the Linux server cluster. In high concurrency and high load scenarios, you can collect all the information (including CPU, memory, I/O, disk, and network traffic) occupied b

Nmon (also known as Nigel rsquo; sMonitor) is a very common system performance monitoring tool developed by IBM engineer nielgriiths and suitable for AIX and Linux operating systems. This tool can directly display the resource utilization of the current operating system on the screen to help you identify system bottlenecks and assist in system tuning. Thanks to its fame, we have made a simple recommendatio

How to Use Nmon to monitor Linux system performance Nmon (also known as Nigel's Monitor) is a very common system performance monitoring tool, developed by IBM engineer Nigel Griffin iths, applicable to AIX and Linux operating systems. This tool can directly display the resource utilization of the current operating syst

Nmon (named Nigel's Monitor) is a computer performance system monitoring tool developed by IBM employees Nigel Griffiths for AIX and Linux systems. Nmon can display the operating system statistics on the screen or stored in a data file to help understand the use of computer resources, adjust direction and system bottlenecks. This system benchmark tool only needs to use one command to get a lot of important

Nmon is a tool for collecting performance data and analysis of Aix or Linux hosts and is easy to use. There are two main, one is the Nmon collection Data tool, the general name is nmon_**, for example nmon_aix5.3, another is the analysis result tool, it is an Excel file, the name is: Nmon analyser v33a.xls.Nmon displays all important performance tuning informatio

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