file memory

This article is mostly reproduced and assembled, just think that these knowledge should be put together better. How process system resources are usedMost processes request memory using GLIBC, but GLIBC is also an application library that ultimately

Explain the output of the free command on Linux.Here is the result of the free run, with a total of 4 rows. For convenience, I added a column number. This can be seen as a two-dimensional array fo (free output). For example:FO[2][1] = 15402628 fo[3][

Reprinted from: http://langgufu.iteye.com/blog/2107023Java handles large files, generally with bufferedreader,bufferedinputstream such as buffered IO classes, but if the file is oversized, the faster way is to use Mappedbytebuffer.Mappedbytebuffer

1. What is serializationJava is an object-oriented programming language, and sometimes it is necessary to save the object, and it can be restored smoothly the next time it is used. Because this requirement is common, the Java API supports this by

Turn from: Hacker anti-virusFar-threaded injection of DLL injection technologyDLL injection technology refers to the loading of a DLL file into the exe file, and become part of the EXE file, the purpose is to facilitate us through this DLL read and

As we all know, Java in the processing of large amounts of data, loaded into memory will inevitably lead to memory overflow, and in some data processing we have to deal with a huge amount of data, in doing data processing, our common means is

Unix File System OverviewEvery process in Unix has a current working directory.To identify a specific file, a process uses the pathname. If the first character of the pathname is a slash, the path is the absolute path, and its starting point is the

Under Linux, we use the top command to view system processes and top to display system memory. The special tool that we use to view content under Linux is the free command.Linux under Memory View command free detailed:View memory under Linux We

The common storage engine for MySQL is MyISAM, InnoDB, memory, MERGE, where InnoDB provides transaction security tables, and other storage engines are non-transactional security tables.MyISAM is the default storage engine for MySQL. MyISAM does not

OverviewRegardless of which database we use, no matter how we design the database, I would like to follow a principle: data security and performance efficiency of the two main aspects, but about these two aspects of the topic too much, here is not a

Define functions, call functions:defFunction_name (x, y):#define function, add parameter (none) 　　 " "This function is used to print" " #Document Description 　　 Print('Study Hard')#function Body 　　 return0#returns a value of 0 if multiple values

1. The reason why a "waitfortargetfps" fee resource is too high in profilerpicture Tearing, the speed of the graphics card rendering output is not synchronized with the monitor, if the display is refreshed while the video card creates a new frame,

Access mode of the file:1. Standard mode:2. Synchronous mode:3. Memory Mapping Mode:4. Direct i\o mode5. Asynchronous mode:Memory-Mapped mode:1. Shared type: Any write operation on the linear Zone page modifies the files on the disk, and this

All of Java's I/O mechanisms are input and output based on data streams that represent the flow sequences of character or byte data. Java's I/O stream provides a standard way to read and write data. Any object in Java that represents a data source

PHP provides three ways for sesion storage: File/memory/custom storage, using file storage by default. This is not a good way to go on a Web site with a large volume of traffic, because it can result in a lot of redundancy in the input and

1.1 Package Unpack Command (TAR)Common packing commands: tar, usually with the following parameters: -C: Set parameters command for compressed files (create) -x: Extracting parameter commands for files -Z: Do you have the gzip attribute at the same

How to build your CDN server At present, in Free CDN market, 360 because of "free" and the bigger, accelerate the music to do very early. But because the free node is not many, many users have been strong away. Safety treasure is also good now. At

During system maintenance, you may need to look at the CPU usage at any time, and analyze the system condition according to the corresponding information. In CentOS, you can view CPU usage through the top command. When you run the top command, the

Command:cat/proc/9744/status  //9744 for process ID Name:gedit/* Process's program name */ State:s (sleeping)/* Process status information */ tgid:9744/* Thread Group number */ pid:9744 * Process pid*/ PPi d:7672/* Parent process pid*/

Let's take a look at an example and write it yourself. The first step is to find the newly added disk usage FDISK-L lists all the disks. The more stupid way can also go to the/dev directory under LS, see the newly added disk name. If it's just a