prometheus io

Java IO Stream LearningClasses or interfaces related to Java stream operations:Java Flow class diagram structure:concept and function of flowA stream is a set of sequences of bytes that have a starting point and an end point, a generic or abstract of the data transfer. That is, the transmission of data between the two devices is called the flow, the essence of the flow is data transmission, according to the data transmission characteristics of the str

It is the well-known "Murphy's Law" to be afraid of what to do. Java Foundation covers all aspects, dare to say that the Java foundation of the people are not just graduating students, is working n years of programmers. Programmers who work n years don't even dare everyone to say that Java is a solid foundation, or even proficient, often just "without him"-skilled.Io This piece I am really afraid, it is not difficult, there are only two aspects: input/output. But you said it used a lot, I believ

Asynchronous First, talk about asynchronous IO (Aio) In HP-UX, when synchronous IO is used, this means that the previous IO must return the "successful write" information before the next write Io, and see a performance bottleneck in the synchronous IO mode in a system with a

One. NUMA settingsStandalone single instance, it is recommended to turn off NUMA, there are three ways to shut down:1. Hardware layer, set off in BIOS;2.OS kernel, set numa=off at startup;3. You can modify the memory allocation policy to Interleave (cross) with the Numactl commandMethod 3Modify Mysql.server 330 lines plus numactlVi/opt/mysql/bin/mysql.server /usr/bin/numactl--interleave all $bindir/mysqld_safe--datadir= $datadir--pid-file= $server _pid_file $other _args > /dev/null 2>1

Original address: http://tutorials.jenkov.com/java-nio/nio-vs-io.htmlauthor : Jakob Jenkov translator : Guo proofreading: Fang FeiAfter learning the APIs for Java NIO and Io, a problem immediately poured into my mind:When should I use IO and when do I use NIO? In this article, I'll try to clearly parse the differences between Java NiO and Io, their usage scenario

Transferred from: http://blog.csdn.net/keda8997110/article/details/19549493After learning the APIs for Java NIO and Io, a problem immediately poured into my mind:When should I use IO and when do I use NIO? In this article, I'll try to clearly parse the differences between Java NiO and Io, their usage scenarios, and how they affect your code design.The main differ

{alert ('The browser does not support WebSocket ~ ');} Currently, browsers such as chrome and firefox support websocket, but IE does not. Next, let's briefly talk about the server's support for websocket. The server supports many websocket languages and has related open-source projects, such as php phpwebsockets: http://code.google.com/p/phpwebsockets/, Java's jwebsocket:http://jwebsocket.org /.For more information, see this article: Start Using HTML5 WebSockets Today.Socket.

Transferred from: http://www.cnblogs.com/zhaoyl/p/5901680.htmlAfter reading this article, the title is self-evident. Transfer from http://blog.chinaunix.net/uid-27105712-id-3270102.htmlIn Linux development, there are several things related to performance, technical staff are very concerned about: process, cpu,mem, network io, disk IO. This paper intends to be detailed and comprehensive, in layman's terms. P

After learning the APIs for Java NIO and Io, a problem immediately poured into my mind:When should I use IO and when do I use NIO? In this article, I'll try to clearly parse the differences between Java NiO and Io, their usage scenarios, and how they affect your code design.The main differences between Java NiO and IOThe following table summarizes the main differ

Generalized synchronous/asynchronous, blocking/ non-blocking Synchronous vs Asynchronous (synchronous vs asynchronous) A message communication mechanism that synchronizes and asynchronously concerns. Synchronization and Asynchrony are just the mechanisms for how messages of concern are notified. In the case of synchronization, it is up to the handler to wait for the message to be triggered (take the initiative to get the state), and asynchronously to notify the processing message by the trigge

1.1.Event-Driven Event-driven is a programming paradigm, a programming style that specializes in dealing with unknown events by binding an event, activating the thing after an external trigger, and achieving the purpose of performing certain operations. such as the browser's onclick () event1.2.IO Model Basics Before interpreting, there are a few concepts to be explained: User space and kernel space Process switching Blocking of proc

Classes or interfaces related to Java stream operations:Java Flow class diagram structure:concept and function of flowA stream is a set of sequences of bytes that have a starting point and an end point, a generic or abstract of the data transfer. That is, the transmission of data between the two devices is called the flow, the essence of the flow is data transmission, according to the data transmission characteristics of the stream abstracted into various classes, convenient and more intuitive d

Classes or interfaces related to Java stream operations:Java Flow class diagram structure:concept and function of flowA stream is a set of sequences of bytes that have a starting point and an end point, a generic or abstract of the data transfer. That is, the transmission of data between the two devices is called the flow, the essence of the flow is data transmission, according to the data transmission characteristics of the stream abstracted into various classes, convenient and more intuitive d

Classes or interfaces related to Java stream operations:Java Flow class diagram structure:concept and function of flowA stream is a set of sequences of bytes that have a starting point and an end point, a generic or abstract of the data transfer. That is, the transmission of data between the two devices is called the flow, the essence of the flow is data transmission, according to the data transmission characteristics of the stream abstracted into various classes, convenient and more intuitive d

Each peripheral is controlled by reading and writing its registers. Peripheral registers, also known as I/O ports, typically include: control registers, status registers, and data registers.Depending on the CPU architecture, there are two ways that the CPU addresses the IO port:(1) I/O mapping mode (i/o-mapped)Typically, such as the X86 processor regards the peripheral registers as a separate address space (called an I/O address space or I/O port spac

Detail with diagramThe first IO modelBlockingThe second IO modelNon-blocking IOprinciple: change from blocking to non-blocking, come back every once in a while (see once, the kernel will send a system call), if nothing else (for small amount of code), the process actively pollingWhen the server-side socket is setblocking (false), the socket is a non-blocking socket, and when the client link is not received,

From Http://www.cnblogs.com/oubo/archive/2012/01/06/2394638.html, written in great detail.Classes or interfaces related to Java stream operations:Java Flow class diagram structure:concept and function of flowA stream is a set of sequences of bytes that have a starting point and an end point, a generic or abstract of the data transfer. That is, the transmission of data between the two devices is called the flow, the essence of the flow is data transmission, according to the data transmission char

Basic IO Library Type: istream (Input stream) type, provides input operation Ostream (output stream) type, provides output operation Cin, a IStream object, reads data from standard input cout, a Ostream object, writes data to standard output cerr, A Ostream object, usually used for outputting program error messages, to write to standard error GT;GT: Used to read input data from a IStream object File IO clas

encoding in the parameter, which is usually omitted. The system uses the OS lang, and the method byte[] String.getbytes (String charsetname) is the same when the character is converted to a byte stream, which is actually a string to byte[. A buffer in a file operation that refers to a specified amount of memory used to hold data in a file IO data stream, and the purpose of buffering is to increase the efficiency of writing or reading data frequently

Five communication models of the operating system 1. Blocking I/O Is our common socket, the listening port receives the message to process, and returns the result to the client Waits until the I/O operation is complete and does not give control to the program. Socket defaults to blocking mode The application calls an IO function, causing the application to block and waiting for the data to be ready. If the data is not ready, wait .... Data ready, copy