storage devices of computer

Information StoreThe machine-level program treats the memory as a very large byte array calledVirtual Memory, each byte of the memory is identified by a unique number, called itsAddress, a collection of all possible addresses is calledVirtual address spaceThis virtual address space is just a conceptual image of a machine-level program. The actual implementation is to combine random access memory (RAM), disk storage, special hardware, and operating sys

Computer storage unit bit (BIT) (binary digits): stores a bit of binary, that is, 0 or 1, the smallest storage unit. Byte: eight binary bits are one byte (B), the most common unit. That is, 1B (byte bytes) = 8 bit computer storage units are generally represented by B, kb, MB

Tags: Floating Point Storage StructureToday, we will review double storage ).Double (32 bytes)The first row stores positive and negative numbers. 0 is positive and 1 is negative.2nd-12-bit storage index, the index result should be-1023All the remaining bit storage valid bitThe operating system on my

This article summarizes the image storage format that I understand.The data in the computer is binary, so the picture is no exception.This is a description of the OpenCV document, which is stored in the code using a matrix.Similar is (BGR format):The smallest unit of the picture is the pixel, here is the BGR (usually the notation of blud, Green, and red) that represents each pixel corresponding to the value

References: A thorough understanding of computer systems, Chapter 6 6.1.1 Random Access to Memory RAM 1. Static RAM (SRAM) and dynamic RAM (DRAM) First. Basic concept: the structure of a single bit in the SRAM storage requires six transistors, and the structure of a single bit in the DRAM storage is a capacitor (DRAM can reach a higher density than the SRAM ). As

1, the computer stores the smallest unit of information, called bit (bit), transliteration bit, binary of a "0" or a "1" called A.2. The basic unit of computer storage capacity is byte (byte), transliteration is Beit Hanoun, 8 bits compose 1 bytes, a standard English letter occupies a byte position, a standard Chinese character occupies two byte position.3, the s

Verify that the computer is a big-endian storage or a small-end storage # include "C Language" verifies whether a computer is a big-endian or small-end storage

Suddenly thought of the computer's complement, now use this topic to review the relevant knowledge pointsunsigned char ch =-1;int val = ch;The final value of Val is 255;Converted to binary,-1 Source: 1000 0001, anti-code: 1111 1110, negative numbers in the computer is in the form of complement, 1 of the complement: 1111 1111CH variable is unsigned, that is, the entire complement of bits are numeric digits, 1111 11,112 binary bits converted to decimal

two kinds of coding commonly used in digital system, one is binary encoding and the other is decimal code. (2) GB and GBK GB encoding standard, the more commonly used is GB2312 and GBK two kinds, GB2312 is a subset of GBK. GBK uses a double-byte representation, the overall encoding range is 8140-fefe, the first byte is between 81-fe, and the tail byte is between 40-fe, rejecting xx7f a line. A total of 23,940 code positions, a total income of 21,886 Chinese characters and graphic sym

× [CPIexe ＋ 访存次数 / 指令数 × 失效率 × 失效开销] × 时钟周期时间3.8 Cache Optimization(1) 8 methods to reduce the loss of efficiency增加Cache块大小提高相联度增加Cache的容量Victim Cache伪相联映像Cache硬件预取编译器控制的预取编译器优化(2) 5 ways to reduce the cost of failure读失效优于写写缓冲合并请求字处理技术非阻塞Cache技术采用两级Cache(3) 4 ways to reduce the hit time容量小、结构简单的Cache虚拟CacheCache 访问流水化Trace Cache3.9 Ways to reduce cache failure efficiency(1) Reasons for failure1）强制性失效：当第一次访问一个块时，该快不在Cache中，需从下一级存储器中调入Cache，这就是强制性失效。2）容量失效：如果程序执行时所需的块不能全部调入Cache中，则当某些块被替换后，若又重新被访

int occupies 4 bytes in a 32-bit computer, primarily to figure out the order in which the 4 bytes are stored in memory.1#include 2 3 using namespacestd;4 5typedefstructInt_char6 {7 intA;8UnsignedChar*b;9 };Ten One intMain () A { - Int_char A; - inti; the //test int; -A.a=0X01AB02CD; -a.b= (unsignedChar*) a.a; - for(i=0;i4; i++) +printf"%02x\n", * (a.b+i)); -cout""Endl; + //test short; A ShortC=0x01ab; ata.b= (unsignedChar*)

Win7 system computer View picture image size and storage size method 1, with the left mouse button click to see the picture; 2, click the picture, the picture is in the selected state, will become blue bottom; 3. When the picture is in the selected state, look at the bottom of the picture's window, where it will display the storage size and size

Computer storage units: Byte, KB, MB, GB, TB, PB, EB, ZB, YB, DB, NB How much do you know? In the computer newspaper, the Dutch bank's 20 data centers have about 7PB of disk and more than 20PB of tape storage, and the annual growth of 50%~70% reserves, So want to see how much PB, calculate 27pb about 400,000 80 of the

For the storage structure of computer viruses, different types of viruses, the storage structure on the disk is different. 1. Overall partition of disk space the formatted disk includes the master Boot Record area (only the hard disk), the boot record area, the file allocation table (FAT), the directory area, and the data area. The primary boot record area and t

In the computer newspaper, I saw that ABN Amro's 20 data centers have about 7PB of disk and more than 20PB of tape storage, and the annual 50%~70% growth of storage, So I want to see how big the PB is, and calculate the 27PB size of the hard disk about 400,000 80. 1Byte = 8 Bit (0,1) 1 KB = 1,024 Bytes (size of a shortcut) 1 MB = 1,024 KB = 1,048,576 Bytes (size