Today, when using AB for stress testing, it is unintentional to discover:Requests per second:xxx [#/sec] (mean)Ab-n 5000-c http://www:8080/upload/5kb.jpg (nioserver:700 aio:400)Ab-n 5000-c http://www:8080/upload/18kb.jpg (nioserver:560 aio:360)Ab-n 2000-c http://www:8080/upload/134kb.jpg (nioserver:330 aio:300)Ab-n 2000-c http://www:8080/upload/134kb.jpg (nioserver:330 aio:260)ab-n 3000-c http://www:8080/upload/134kb.jpg (nioserver:300 aio:310)Ab-n 5000-c http://www:8080/upload/134kb.jpg (nioser
Java-IO streams, Java IO stream characters
Java text (char) is a 16-bit unsigned integer and unicode (dubyte encoding) of characters ).
The file is a data sequence of byte.
A text file is a storage result of serialized text (char) sequences into bytes according to a certain encoding scheme (uft-8, utf-16be, gbk.
Pipeline stream (Reader, Writer) --> operates on text and text files
1. Processing of charact
Java learning notes-10. io stream, java learning notes-10.io
1. The input stream can only read data from it, but cannot write data to it. The output stream can only read bytes of data.
2. The InputStream types include:
ByteArrayInputStream contains a memory buffer, which is extracted from byte. FileInputStream obtains bytes from the file. ObjectInputStream is used to restore serialized objects. PipedInput
Synchronous and asynchronous Io, blocking and non-blocking Io
Many times we often see synchronous and asynchronous, blocking, and non-blocking. In some cases, the synchronization and blocking operations are placed with equal signs. Asynchronous and non-blocking draw an equal sign. In fact, this is not correct. Synchronization is not equal to blocking, while Asynchronization is not equal to non-blocking. Nex
Sys_select ()------> Do_select ()The final call to the file descriptor fd corresponds to the struct file type variable of the struct file_operations *f_op of the poll function.The function that poll points to returns information that is currently read and written.1) returns read and write information if it is currently readable or writable.2) If it is not currently read/write, block the process and wait for the driver to wake up, call the poll function again, or return the timeout.3, the driver
[] args)throwsunsupportedencodingexception {Try { //1. Declaring an input streamFileInputStream fis=NewFileInputStream ("D:/test/s1.txt"); //2. redirectionsystem.setin (FIS); //3. Read the contents of the system.in standard input streamBufferedReader br=NewBufferedReader (NewInputStreamReader (system.in, "gb2312"));//Set character encoding//4. Output the contents of the system.inString line=NULL; while((Line=br.readline ())! =NULL) {System.out.println (line); } //5. Close
layout algorithm used by most file systems, the files in each directory tend to be distributed adjacent to the disk.2,inode number: Using inode sorting is more efficient than path sorting, and in general, the order of the inode means the order of the physical blocks.3, the physical block of the file: the physical block is obtained through the file logical block, and then sorted again. The first step is to determine the number of blocks in the file. This can be done through the stat () call. Sec
Java IO stream byte stream, java IO stream byteI. Common file Operations
File file = new File ("E: \ test \ javaIo"); System. out. println (file. isDirectory (); // determines whether the file is a directory (if the file does not exist, false is returned) System. out. println (file. isFile (); // determines whether the file is a specific file System. out. println (file. exists (); // determines whether the
Share an asynchronous task that supports the secondary method of recursive callback when an IO exception occurs. io Recursion
public void TryAsyncActionRecursively executeFailedAction(ex); } }); var completeAction = new Action
This function is used to execute an asynchronous Task (return the Task method). If an IO exception occurs during e
IOS: card. io usage, ioscard. io usage
Recently, a function is used to scan a bank card and obtain the bank card number. After searching the Internet, the SDK card. io is used. The process is as follows:(1) download Card. ioCard. i/O allows the mobile phone camera to obtain credit card information, and uses OCR (Optical Character Recognition) Scanning Technology
Python implements asynchronous IO through poll, and pythonpoll asynchronous io
This example describes how Python implements asynchronous IO through poll. Share it with you for your reference. The specific analysis is as follows:
Poll object is returned after poll () is used. This object supports the following methods:PollObj. register (fd, [, eventmask]) the firs
In this article we will implement the buffer of the loopback server. The implementation of buffer The previous section mentions that non-blocking IO must have buffer. Once again, describe the design of the buffer: One thing to add here is that Writeindex points to the first position of the free space. There are three important invariant expressions :
1.0
2. Writeindex–readindex is the number of bytes that can be read from
This is a creation in
Article, where the information may have evolved or changed.
Interface Definition-BASIC interface
//-----------------------------------------------------------------------------//============================== ===== Basic Interface ===================================//----------------------------------------------------------------- The------------//Reader interface is used to output its own byte data. There is only one duck method read. Parameter P: reads the data stream
;15//Determines whether a prime number is a public boolean isprime (i NT N) {(int i=2;iIf the stream is not buffered, the program reads a data and writes a data. This greatly affects the efficiency in a program with large data volumes. The buffer stream function is to write the data to the buffer, wait for the buffer full, and then write the data into the file. So the efficiency is greatly improved.Original address: http://www.cnblogs.com/liuling/archive/2013/05/07/InputStreamAndOutputS
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.