linux performance counters

Introduction to common linux performance monitoring tools and linux performance monitoring tools Record several frequently used ones.1. top/htop As we all know about top, there are several common parameters: (you can also start and interact) -D: Set the delay time-S: accumulative time mode k: End Process q: Exit topZ:

Performance Test Training: 18 commands and tools to help you locate Linux performance issuesPoptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Pop

Tags: partial kernel software detailed storage System database query system cache system processThe purpose of 1.Linux performance analysis1) Identify system performance bottlenecks (including hardware bottlenecks and software bottlenecks);2) provide a performance-optimized solution (upgrade the hardware?) Improve syst

Python is used to monitor linux performance and process consumption performance. This article provides an example of how to monitor linux performance and process consumption performance using python. The specific implementation co

Talking about linux performance tuning 13: performance analysis concepts; talking about linux performance tuning 12: Red Hat optimization strategy Tuned http://www.2cto.com/os/201307/229281.html About the performance metrics of th

theTcpthe number received“Port”the message. By convention, each type of network service is assigned a number that is not understood, that is, a different port. LikeHTTPis a80Ports,Sshis a22Ports,Ftpis a23.typically the service distinguishes the type of port, but in order to avoid the port being mixed, it is usually known that the portTcpPorts andUdpthe ports are set to the same. Like everybody saysSshis a22ports, although using theTcpprotocol, but usuallySshwill also occupy22of the PortUdpservi

Article Title: IO system performance: monitors IO performance in Linux. 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. Dd command Dd ac

4.1Process Performance Statistics4.1.1.Kernel TimeVsUser TimeThe most basic partitioning of an application's time is the kernel time and user time. Kernel time is spent on the Linux kernel, while user time is spent on the application or library code. Linux has tools, such as time and PS, that can (roughly) indicate whether the application spends its hours on the

regularly to get new ideas--and keep them fresh.1.1.2 Perform repetitive tasks automaticallyThere are many commands for Linux, and it is easy to enter a command that is responsible for errors. Therefore, it is a good idea to automate performance tools and application testing. The invocation of the performance tool is suggested to be written in script or saved

Linux uses iostat to analyze IO performance and linuxiostatio Performance Original article: http://www.cnblogs.com/bangerlee/articles/2547161.html For I/O-bond processes, we often use iostat to view the number of IO requests issued by processes and the time consumed by the system to process IO requests, then, analyze whether there is a bottleneck in IO during the

Memory performance MetricsMemory-based conceptsExecute the top command first to see the relevant parts of the memory in the results# TopWhat are the VIRT,RES, andswaps ?The following 3 concepts are:Physical Memory Resident- RESActual memory space RAMSwap Area Swapped- SWAPWhen there is not enough physical memory, the operating system will swap out the infrequently used pages in memory to disk spaceSwap into physical memory when the page being swapped

can be used directly. If it is not in the L1 cache , the processor produces a L1 cache Miss. It then checks the L2 advanced cache, and if the data is in the L2 cache, it can be used directly, otherwise it is processed as above, and then the information is retrieved in physical memory. Use caching wisely to reduce the number of cache misses, which can improve performance. 5.2Memory Performance Tools5.2.1 PS

concerned business operations), and then obtain "concurrent users" based on the scenario using some methods (mathematical models and formulas that compute the number of concurrent users). The reason for this is: Suppose an application system, the peak of 500 people at the same time online, but these 500 people are not concurrent users, because it is assumed that at a point in time, 50% of the people are filling in complex forms (filling out the form action on the server without any burden, only

Chapter 8 high-performance Server programming in Linux (high-performance server program framework)8. High-performance server program frameworkThe server is reconstructed into three main modules:IO processing unit. Four IO models and two efficient event processing modes.Logical unit. Two Efficient concurrency modes.Stor

This article implements Python's method of monitoring Linux performance and process consumption performance in an instance form, implementing the following code: #-*-Coding:utf-8-*-"" "Created on Tue June 10:20:13 2014 @author: Lifeix" "" from collections import ordereddict Import time import os def cpuinfo (): lines = open ('/proc/stat '). ReadLines

1 CPU hotspot Analysis positioning backgroundCPU resources are still very expensive, in order to feel this expensive, the current CPU price of resources:So for the program apes, it is necessary for the program to use CPU resources reasonably and efficiently . using limited CPU resources to solve the actual problems we face , that's why we want to optimize the program as much as possible.The introduction from the micro-level, do not do macro-level introduction (such as data center-level capacity

http://blog.csdn.net/wlsfling/article/details/5876134 Content Overview 1.oprofile Introduction 2.oprofile Installation and Linux kernel compilation 3.oprofile use First, Oprofile Introduction Oprofile is a powerful performance analysis tool on the Linux platform similar to the INTEL VTune. It supports two types of sampling (sampling) modes: event-based sampling

what processes in the current system consume a lot of resources. You can use the vmstat, mpstat, and other commands described below for further troubleshooting. Use the tuptime tool to view the Linux server system boot time history and statisticsDmesg | tail $ dmesg | tail[1880957.563150] perl invoked oom-killer: gfp_mask=0x280da, order=0, oom_score_adj=0[...][1880957.563400] Out of memory: Kill process 18694 (perl) score 246 or sacrifice child[18809

Poptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Poptest's LoadRunner training, in order to improve the performance of students experience, add a lot of server optimization knowledge, for performa