server io

Background: Pio DMA interrupt polling The speed of early I/O devices is not too high compared with that of CPU. The CPU periodically polls the IO Device once to see if there are any processing requirements. If yes, it will be processed and then return to continue working. So far, the floppy disk still keeps this round robin method.With the rapid increase in CPU performance, this inefficient way of working wastes a lot of CPU time. As a result, interru

Server performance indicators As a network server program, performance is always the first indicator. Performance can be defined as the number of tasks that can be processed in a given hardware condition and time. The server design that maximizes the use of hardware performance is a good design.A well-designed server s

Today to review the basic IO, which is the most common IO. Basic knowledge and concepts of network IO General IO and Bio server Use of NiO with server Hello World Netty Getting Started with

Asynchronous Io, APC, Io completion port, thread pool, and high-performance server (APC)Alertable Io provides a more effective asynchronous notification format. Readfileex/writefileex provides a callback function (APC process) when sending an IO request. After the

use the bindiocompletioncallback function to deliver an asynchronous Io operation. On the IO completion port, the callback function is also executed by the thread pool thread.When the queueuserworkitem function or bindiocompletioncallback function is called for the first time, the thread pool is automatically created, or when timer-queue timers or registered wait operations are placed in the callback funct

Alertable Io provides a more effective asynchronous notification format. Readfileex/writefileex provides a callback function (APC process) when sending an IO request. After the IO request is complete, the callback function will be executed once the thread enters the alarming status.The following five functions enable the thread to enter the alarm status:SleepexWa

the call does not immediately return the result of the call, and the current thread has been blocked, only if the call to obtain results or time out when the return. And our figure 2-6-1-1 also has a lot of nodes are blocked, for example, the server blocked listening client, until a client access to return a socket, for the client, after establishing a socket connection, also block until the server respond

Most of the IO statistics tools under Linux, such as Iostat, Nmon, and so on, are only counted to the Per Device's read and write situations, and if you want to know how each process uses IO, it's a bit cumbersome.If you can systemtap, or blktrace these things difficult to everyone, but no special tools are always not very comfortable. Fortunately, the Linux 2.6.20 kernel provides an

Label:The IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk performance, the primary measure (metric) is IO latency, whic

In this article, we'll look at what new features SQL Server 2014 adds to resource governor in the future. Resource governor (Resource Governor) is a feature that appears starting with SQL Server 2008. It is a feature used to manage SQL Server workloads and system resource usage. Before SQL Server 2014, resource Governo

For the characteristics of the single-threaded server model, we can improve it so that it can respond to multiple clients simultaneously. The simplest improvement is the use of multi-threaded (or multi-process) server models, at the application layer level, where we typically use multithreaded mode. Multithreading enables multiple clients to request at the same time, and can respond to these requests almost

Tags: time interval fetch number release operation rebuild file GIF world loadThe IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk performance, the primary measure (

Preface Today, users expect fast and dynamic applications that can be accessed through the web. This article series shows how to use reverse Ajax (reverse Ajax) technology to develop event-driven Web applications. Part 1 of the series describes reverse Ajax, polling, streaming, Comet, and long polling ). You have learned how comet uses HTTP long polling. This is the best way to reliably implement reverse Ajax, because all existing browsers provide support. Part 1 of the series illustrates how to

Author: obuntu I like the theory that SQL server uses four steps to locate performance problems. The details are as follows:1. resource bottleneckI. Memory II. CPU III. Io2. tempdb bottleneck3. Find slow statements. You can search for them in three ways.I. Statistics II. Missing indexes III. Blocking4. cache Execution Plan Analysis For more information, see this article http://blogs.msdn.com/ B /jimmymay/archive/2008/09/01/sql-

Original: Set STATISTICS io and set STATISTICS time in SQL Server query performance optimizationIn recent times, has been exploring the SQL Server query performance issues, of course, also aimless search for a lot of information, but also from the online great God's articles learned a lot, here, to the great God salute. It is by the selfless dedication of the gre

Java to implement IO communication (server article)How to use Java to implement our communications? First we understand what communication is? What is the mechanism of communication?Let's start with a discussion of what is communication? Communication refers to the exchange and transmission of information between a person and a person or a person and nature through a certain act or medium, which in a broad

Tag: Style color IO using strong SP data on problemIn recent times, has been exploring the SQL Server query performance issues, of course, also aimless search for a lot of information, but also from the online great God's articles learned a lot, here, to the great God salute. It is by the great God selfless dedication of the influence of the spirit, so, the younger brother also in return, share about the se

Introduction With the continuous development of information technology, each enterprise IT infrastructure is also moving towards virtualization, large data, cloud computing and other streamlining, integration trend. Virtualization technology becomes particularly important. Today we want to introduce you to the Power server virtualization technology in a small part of the virtual IO

The first thing to note is that the content of this article is not how to tune SQL Server query performance (about which you can write a book), but how to leverage the set STATISTICS IO and set STATISTICS in SQL Server query performance tuning Time these two frequently ignored Transact-SQL commands.On the surface, the adjustment of query performance is a very sim

Tags: time difference binary not for simple JPG rop condition Sele sizeFor statements to run, there are other factors to consider, in addition to the execution plan itself, such as the compile time of the statement, the execution time, the number of disk reads, and so on. If the DBA is able to run the problem statement separately, you can open the following three switches before running to collect statistics about the statement run. This information is valuable for analyzing problems. 1 set STAT