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A regular expression (regular expression) is an object that describes the character pattern. JavaScript regular expressions can be used for powerful pattern matching and text retrieval and substitution functions. Cell phone number Regular expression validation. function Checkphone () { var phone = document.getElementById (' phone '). Value; if (!) ( /^1[

CPU performance indicators 1. CPU usage ratio of user processes 2. CPU usage ratio of System Processes 3. WIO, waiting for I/O is the ratio of the CPU in idle state. 4. CPU idle rate 5. Percentage of CPU used for context switching

This article describes how to use cgroups to manage CPU resources. Let's talk about the CPU usage of the control process. When running multiple programs on a machine that may consume a large amount of resources, we do not want a program to occupy all the resources, so that other programs cannot run normally, or the system is suspended for maintenance. At this time, cgroups can be used to control the resourc

The Linux kernel is a great circus performer who plays juggling carefully between process and system resources and keeps the system running properly. At the same time, the kernel is fair: it allocates resources equitably to processes. But what if you need to prioritize an important process? Or, how do you reduce the priority of a process? Or, how do you limit the resources used by a group of processes? The answer is that the user is required to specify the priority of the process for the kerne

When using the top command, we will see this line: What do the values in it mean? I was asked this question today and found that the answer is not very clear. Sure enough, the most frequently used top commands every day are still unknown... Shame... So I checked some information: The official explanation of Cpu (s) indicates cpu information. The meaning of each value is: us: usercputime (or) % CPUtimespenti

We can use/proc/cpuinfo to view CPU information. This file contains the data section of each processor on the system. There are six entries in the/proc/cpuinfo description for multi-core and super-thread (HT) technical checks: processor, vendor id, physical id, siblings, core id and cpu cores. (1) processor: including the unique identifier of the logical processor. (2) physical id: including the unique id

0. Prepare knowledgeHyper-Threading Technology (hyper-threading): Using special hardware instructions, the two logical cores (CPU core) are simulated into two physical chips,Allows a single processor to use thread-level parallel computing, which is compatible with multi-threaded operating systems and software, reducing the idle time of the CPU and improving the efficiency of

Add by Zhj: Here's a good explanation of what WA means in the top command, and we know that when Io is blocked, the operating system changes the process to a blocking state, and the CPU is scheduled to run other processes.When the CPU is idle, it checks for blocked IO (disk or network), and if so, it is WA; if not, that is the real idle. In the top command, 85.1%id is the true idle ratio, and has the follow

HadoopYARN supports both memory and CPU scheduling (by default, only memory is supported. If you want to further schedule the CPU, You need to configure it yourself ), this article describes how YARN schedules and isolates these resources. In YARN, resource management is completed by ResourceManager and NodeManager. Hadoop YARN supports both memory and CPU schedu

Mature computer users, in addition to being careful when buying computer hardware, know how to maintain your computer is also very important. Because the computer is well maintained, it can not only help you complete your work smoothly, but also serve you "Faithfully" for a long time. Today, let's take a look at the computer's brain-how to maintain the CPU to stay young! The CPU (central processor) is like

You will see this line when you use the top command:650) this.width=650; "title=" image () "border=" 0 "alt=" image () "Src=" http://image.mamicode.com/info/201606/ 20181018163955000369.png "width=" 1096 "height=" "style=" border:0px;padding-top:0px;padding-left:0px; Padding-right:0px;background-image:none; "/>What are the meanings of each of these values?Asked this question today, I found that the answer is not very clear. Sure enough, every day with the most top command has not been well-acqua

These days I have been studying shell scripts and writing some system load and CPU monitoring script programs. Without nagios monitoring software, as long as the server can access the Internet, you can send an email to remind the administrator of the system load and CPU usage. I. install the shell script and write some system load and CPU monitoring script progra

Note: This content is excerpted from the "DevOps Troubleshooting: Best Practices for Linux server Operations" book System load The average system load is probably the first basic metric to use when solving problems that cause the system to run slowly. When troubleshooting a slow system, the first command I usually perform is uptime:650) this.width=650; "class=" Fit-image "src=" http://s1.51cto.com/wyfs02/M01/26/AA/ Wkiol1nsi6xzdziqaaad5zfasxa907.jpg "height=" "border=" 0 "width=" 4

Linux-CPU performance optimization, Preface What is performance optimization? In my opinion, performance optimization aims to improve application or system capabilities. So how can we optimize the performance of the application? We have designed a lot of content here, including the Linux kernel, CPU architecture and Linux kernel Resource Allocation and Management, and understanding the process creation pro

Transferred from: http://blog.csdn.net/goodluckwhh/article/details/9005585Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Directory (?) [-] One per CPU variable Two-atom operation Three optimizations and memory barriers Four spin lock Spin lock Data structure and macro functions for spin locks Read/write Spin lock Correlation function of read-write

The overclocking of the computer is to improve the working frequency of the CPU, graphics and other hardware by artificial way, so that they work stably under the rated frequency state. The Intel P4C 2.4GHz CPU For example, its rated operating frequency is 2.4GHz, if the operating frequency to 2.6GHz, the system can still run stably, then the overclocking was successful. The main purpose of

Computer use for a long time, it is inevitable that such a failure. In many computer failures, board card class appears the most likely. Although the CPU is an important part of the computer, but the probability of failure is relatively small, common CPU failures are roughly the following: thermal failure, restart failure, black screen fault and overclocking failure. Because the

(corrected) This problem includes the hardware structure of the CPU and the category of assembly language. Here, comb it.First of all, the main "Li Jianguo" self-answer part of the question is said to be correct,the instruction set of the CPU is the interface between the two tiers of software and CPU, and the CPU itsel

Reference: http://blog.csdn.net/eagler_hzh/article/details/6550841 In fact, the function to be extracted is the void Xid _cpu_detect (void) in x264 \ common \ CPU. C. The source file int x264_cpu_cpuid_test( void );void x264_cpu_cpuid( uint32_t op, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx );void x264_cpu_xgetbv( uint32_t op, uint32_t *eax, uint32_t *edx );uint32_t x264_cpu_detect( void ){ uint32_t