prometheus io

Use cgroup to restrict disk io of processes, and cgroup process disk io Cat/etc/cgconfig. conf # # Copyright IBM Corporation. 2007 # # Authors: Balbir Singh # This program is free software; you can redistribute it and/or modify it # Under the terms of version 2.1 of the GNU Lesser General Public License # As published by the Free Software Foundation. # # This program is distributed in the hope that it woco

project and the full path to the outfile group composition file*/ + stringPath = AppDomain.CurrentDomain.BaseDirectory +outfile; - the /*determines whether the file exists and creates if it does not exist*/ * if(!file.exists (path)) $ {Panax Notoginseng file.create (path). Close (); - } the using(StreamWriter writer =file.appendtext (path)) + { A /*write custom da

C ++ uses the IO stream to format and control the output of floating point numbers, io pointsFloating Point Output (100/100 points)Description Write a program, input a floating point number and output format requirements, according to the format requirements of the floating point number output. Given non-negative integers m and n, it indicates that the width before the decimal point of the output floating p

1. Store the data in the collection into a text file case:Requirement: To store string data in the ArrayList collection into a text file?(1) Analysis:Through the meaning of the topic, we can know some of the following things,A string is stored in the ArrayList collection.Traverse the ArrayList collection to get the data.It is then stored in a text file.The text file description uses a character stream .(2)Data Source :ArraylistDestination :A.txt--FileWriter--BufferedWriter2. code example:1 Pack

);Wuyi } the } - Private Static voidCopyFile (file srcfile, file newFile)throwsIOException { WuBufferedinputstream bis =NewBufferedinputstream (NewFileInputStream ( - srcfile)); AboutBufferedoutputstream BOS =NewBufferedoutputstream ( $ NewFileOutputStream (NewFile)); - byte[] Bys =New byte[1024]; - intLen = 0; - while(len = Bis.read (bys))! =-1) { ABos.write (bys, 0, Len); + } the bos.close (); - bis.close (); $ } the}Java Bas

1. Randomly get name cases in a text fileRequirements: I have a text file stored in a few names, please write a program implementation randomly get a person's name.Analysis:A: Storing the data in a text file in a collectionB: Randomly produce an indexC: Gets a value based on the index2. Code implementation:1 Packagecn.itcast_02;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.FileReader;5 Importjava.io.IOException;6 Importjava.util.ArrayList;7 ImportJava.util.Random;8 9 /*Ten * Requirements: I

Goal:1, master the three kinds of system support for IO:System.outSystem.inSystem.err2, master the difference between System.out and System.err.3, master input, output redirect.Constants of the System classJava has some support for the system class for IO, and three constants are prefabricated.PrintStream Out,printstream Err,inputstream in.Variables declared with static final are global constants, and all word letters must be capitalized if they are c

can be divided into which two, respectively, to illustrate1 "input and output relative to program2 "input stream InputStream3 "Output stream OutputStream===============================================================4. According to the implementation of the function is divided into which two, respectively, illustrate1 in accordance with the implementation of the function is divided into "node flow" "Processing flow"2 "node stream: OutputStream3 "Processing flow: OutputStreamWriter==============

Channels are used in concert with the buffer in NIO. A channel is a bidirectional channel that is readable and writable. It is a bit similar to stream, but stream is unidirectional, the application does not directly perform read/write operations on the channel, but must use the buffer. For example, when reading a channel, you must first read the data into the corresponding buffer and then read it in the buffer. An example of using filechannel Package NiO; import Java.

This article was reproduced from: http://mp.weixin.qq.com/s?__biz=MzAxODI5ODMwOA==mid=2666538919idx=1sn= 6013c451b5f14bf809aec77dd5df6cffscene=21#wechat_redirectOn a "chat chat synchronous, asynchronous, blocking and non-blocking" has been popular explanation, to understand the synchronous, asynchronous, blocking and non-blocking important two conceptual points, have not seen, it is recommended to read this blog post to understand the two conceptual points. In cognition, a unified model is estab

Transfer from http://storage.it168.com/a2011/0323/1169/000001169755_all.shtmlAs a database administrator, pay attention to the performance of the system is one of the most important tasks, and in all aspects of attention to performance can only IO performance is the most troublesome piece, facing a variety of jerky parameters and dazzling new terminology, coupled with the memory maker's flicker, always let us have a foggy feeling. This series of artic

analysis of high performance IO model Server-side programming often requires the construction of a high-performance IO model, with four of common IO models: (1) Synchronous blocking IO (Blocking io): The traditional IO model. (2

Objective Blocking io (blocking IO) Non-blocking IO (nonblocking io) IO multiplexing (IO multiplexing) Signal-driven IO (signal driven

it into a blocking state. When a process enters a blocking state, it does not consume CPU resources. File descriptor A document descriptor (file descriptor) is a term in computer science and is an abstract concept that describes a reference to a file. The file descriptor is formally a non-negative integer. In fact, it is an index value that points to the record table that the kernel opens files for the process that each process maintains. When a program opens an existing file or creates a ne

IO Model IntroductionTo better understand the IO model, we need to review it in advance: synchronous, asynchronous, blocking, non-blockingWhat is the difference between synchronous (synchronous) IO and asynchronous (asynchronous) Io, what is blocking (blocking) IO and non-bl

Netty Series (i) Linux network IO Model I. BASIC conceptBefore formally starting the Linux IO model, let's introduce 5 basic concepts.1.1 User space and kernel spaceNow that the operating system is using virtual memory, the 32-bit operating system, its addressing space (virtual storage space) is 4G (2 of 32). The core of the operating system is the kernel, which is independent of the normal application, has

Transferred from: http://www.cnblogs.com/fanzhidongyzby/p/4098546.htmlThis is the clearest article I've ever seen explaining the IO model, and of course, if you want to learn more about it, continue to chew on the Sapphire book.Server-side programming often requires the construction of a high-performance IO model, with four of common IO models:(1) Synchronous blo

Reprinted from Http://www.cnblogs.com/fanzhidongyzby/p/4098546.htmlServer-side programming often requires the construction of a high-performance IO model, with four of common IO models:(1) Synchronous blocking IO (Blocking io): The traditional IO model.(2) Synchronous non-bl

Tags: advantages about select exactly progress bar IMG bit Operations 3.3 update1 Concept DescriptionBefore interpreting, there are a few concepts to be explained: User space and kernel space Process switching Blocking of processes File descriptor Cache IO 1.1 User space and kernel spaceNow that the operating system is using virtual memory, the 32-bit operating system, its addressing space (virtual storage space) is 4G (2

first, the network programming socket API operation meaning Api Blocking Non-blocking Connect TCP three times handshake succeeds and returns. Returns immediately, and other ways are needed to determine whether a TCP connection has been established successfully or failed. Send Block until the pending data is sent from the user space into the kernel send buffer and returned. Returns immediately, regardless of whether the data being sent