marble buffer

The concept of direct buffers versus non-direct buffers: 1) Non-direct buffer: throughStatic Bytebuffer allocate (int capacity)Created buffers that are created in memory in the JVM, before or after each call to a native IO of the underlying operating system, the virtual machine copies the contents of the buffer to the intermediate buffer (or copies the conte

Linux0.11 kernel-buffer mechanism analysis, linux0.11 Buffer The file system contains too many files and is a copy of the MINIX file system. The buffer mechanism is closely related to the file system, so we will analyze the buffer mechanism here. The buffer. c program is use

I/O buffer management for background development and I/O buffer for background Development In Linux I/O, the write prototype is ssize_t write (int filedes, const void * buff, size_t nbytes ); When you call write to write data, write will directly return the data after the call is complete, but the disk is a slow device, and the operating system will save the data in the

1, disadvantage: The cost of creating and releasing direct buffer is higher than the heap buffer;2. Difference: Direct buffer is not allocated on the heap, it is not managed directly by GC (but the Java object of direct buffer is managed by GC, as long as the GC reclaims its Java object, the operating system releases t

Whenever you need to transfer data, it must contain a buffer. The Java NIO API has a very limited number of buffer classes and is not optimized, and bytebuffer operations using JDK are more complex. A buffer is an important build, and it is part of the API. Netty provides a powerful buffer implementation to represent a

Redis configuration Detailed-client buffer http://blog.csdn.net/jiangguilong2000/article/details/38436941Redis Exceptions and Usage summary http://blog.csdn.net/jiangguilong2000/article/details/45025355Client buffer Output Buffer Redis, like its name and design, is a mobile server, and the client (usually) connects to Redis over the network. In this case, the ti

An example shows the relationship between the sending buffer, the receiving buffer, and the sliding window protocol. In the previous articles, I briefly introduced the relationship between the above concepts in TCP network programming and the behavior of several basic socket system calls. Here I will give an example, for each tcp socket, there is a sending buffer

There are two types of depth-buffer (deep cache): Z-buffer and W-buffer. Here we discuss the differences between these two types of deep cache and how to convert them.Meaning of WThe coordinates of 3D spatial points are (x, y, z). In order to make the matrix multiplication function of translation transformation, we use the points (X, Y, Z, W) in 4D space) to repr

First Article " Color buffer " The color buffer (color_buffer) is the frame buffer (frame_buffer), and the scene you need to render will eventually be written to the buffer for each pixel, which is then displayed on the render to the screen. " Depth Buffer " The depth

Java Tour (25)--file copy, character stream buffer, Bufferedwriter,bufferedreader, copy file via buffer, readline working principle, custom ReadLine Let's continue IO for the last space I. Text copying Read and write all said, we look at the other operations, we first look at the replication The principle of replication: In fact, the file data under the C drive is store

What is a buffer definitionSimply said to be a piece of storage area, ha ha, may be too simple, or can be different, from the point of view of the code (can see the JDK buffer, bytebuffer, DoubleBuffer, etc.), the buffer class inside is actually a basic data type array , as well as a variety of operations on this buffered array;Common buffers such as Bytebuffer,

Let's take a big picture first: SQL statement used: BYS @ ocm1> select dbms_rowid.rowid_relative_fno (rowid) file #, dbms_rowid.rowid_block_number (rowid) block #, deptno from bys. test; FILE # BLOCK # DEPTNO ------------------------------ 4 391 10 For example, the text description analyzes the process of obtaining the required data block when the foreground process sends a query statement: Note:This article does not involve the parsing part of SQL statements, client-to-server interaction, and

First, no cache means that there is no cache at the user layer, but for the kernel, it is still cached. If you want to write data to a file, that is, the hard disk), the kernel first writes the data to the buffer storage set in the kernel. write () System Call ), when the buffer is full, it is actually written to the disk. I/O with buffer is to create a

Buffer in Java NIO (2) create/copy a Buffer, niobufferHow to create a buffer You can create a buffer in either of the following ways: 1. Call the allocate Method 2. Call the wrap Method The following uses charBuffer as an example to describe the meaning of each method;Create a buff