Abstract: With the development of the motherland's modernization, the construction of new urban transportation-underground railway is in the ascendant. With the continuous development of automation technology, the centralized control and management
Basic operating commands for the System
1. root/catanaconda-ks.cfg to determine whether to install base software group
Yum groupinstall base can be used to install the base group ifconfig command or use ip addr sh to view IP information.
To use
Basic CentOS command: sarCommon sar command formats
Sar [options] [-A] [-o file] t [n]
Where:
T indicates the sampling interval, and n indicates the number of samples. The default value is 1;
-O file: stores the command results in binary format.
Basic Linux commands: sar and basic linux sarCommon sar command formats
Sar [options] [-A] [-o file] t [n]
Where:
T indicates the sampling interval, and n indicates the number of samples. The default value is 1;
-O file: stores the command results
Why is the server so slow? CPU, RAM, and disk I/O resources are exhausted, and ram is used up
Machine running is slow because it consumes too many system-specific resources. The main resources of the system include CPU, RAM, disk I/O, and network.
Linux "Health Check" indicators and linux health check indicators
Preface
In an environment where "Buddha bless server is not down" and "killing programmers and offering sacrifices to Heaven", programmers are in a war every day. They are trembling
Linux Process Scheduling analysis and linux scheduling AnalysisOverview
Multi-process scheduling is essential for the operating system. Some people say that process scheduling is the most important part of the operating system. I think this is an
1 Overview 1.1 factors affecting Linux Service Program Performance
CPU, memory, disk I/O bandwidth, network I/O bandwidth1.2 Performance Evaluation
CPU: user % + sys %
Memory: Swap In (si) = 0; Swap Out (so) = 0; the Swap partition is not used. If
View the users in the system: cut-d:-f 1/etc/passwdView users who can log on to the system: cat/etc/passwd | grep-v/sbin/nologin | cut-d:-f 1View user operations: w command (root permission required)View A User: w User NameView logon User: whoView
1. Concept of average load
Sometimes we may feel that the system response is slow, but we cannot find the cause. In this case, we need to check the average load to see if there are a large number of processes waiting in the queue. The average number
Common Linux commands: nslookup, lsmd5sum, uname, and history1. nslookup
DNS developers all know what the nslookup (name server lookup: domain name query) command is for. It comes with windows. However, in Linux, enter nslookup to display the
Linux top commands for monitoring and diagnosis tools
Directory
(1) system and task statistics:(2) process and cpu statistics:(3) memory information of the last two behaviors:How does one calculate the actual number of available memory for a program?
In Linux, commands such as uptime, W, and top all have an average system load of average output. What is the average system load?
The average system load is defined as the average process tree in the running queue within a specific time interval.
Performance TuningIt is undoubtedly a huge topic and a very important part of many projects. Performance Tuning is well known. After all, performance tuning covers too many aspects.ArticleLet's take a look at the process of performance tuning this
Functions are such a powerful source of PHP, but many PHP functions are not fully utilized. Here, we will briefly introduce 10 uncommon but useful functions. 1. sys_getloadavg () sys_getloadavt () can obtain the system load. This function returns an
Linux Program management: How to use commands such as Top.htop.glances,dstatThe difference between a process and a thread:Defined:Process is a program with certain independent function, and it is an independent unit of resource allocation and
The best way to manage the Linux process is to use the command line system commands. The Linux process below involves commands such as at, BG, FG, Kill, crontab, Jobs, PS, pstree, top, nice, Renice, sleep, nohup.1. At command: Timed Run
Two consecutive! Represents the execution of the previous command!n here the n is the number that represents the nth command in the execution of the command history! String! PW indicates that the most recent command in the command history that
The SAR (System Activity Reporter report) is one of the most comprehensive performance analysis tools available on Linux, and can be used to report the activities of the system in many ways.Includes read and write files, usage of system calls, disk
PHP 5.3.1
MySQL 5.0.89
Nginx 0.8.33 or 0.7.65 (optional)
This can be compared to what is circulated on the Internet a key installation package is much better, strongly recommend this method installation, suitable for all rookie and master. My
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