popular computer operating systems

bits, 64 bits. Some software, also divided into 32-bit, 64-bit. So what does this "bit" mean?In contrast to 32-bit technology, this bit of 64-bit technology refers to the data width of the CPU GPRs (general-purpose registers, universal Register) is 64 bits, and the 64-bit instruction set is the instruction to run the 64-bit data. This means that the processor can run 64bit data at a time.If the CPU is 64-bit, but the operating system is 32-bit, the p

"In-depth understanding of computer Systems" chapter seventh linksA link is the process of collecting and combining various pieces of code and data into a single file that can be loaded (the goods are copied) to the memory and executed.The timing of the link At compile time, that is, when the source code is translated into machine code Load, that is, when the program is loaded into storage and

First, why should have an operating system? Modern computer systems are complex systems consisting of one or more processors, main memory, disks, printers, keyboards, mouse monitors, network interfaces, and a variety of other input and output devices, and each programmer is not in a position to master the details o

What storage management methods does Intel 80386 chip support?A. Non-segmented and non-Paging storage management methods;B. Non-Segmented paging storage management methods;C. Non-Paging Storage Management for segments;D. Manage the Segmented paging storage.19. Explain the working principle of the segment address translation mechanism in 80386.A. Use the segment register and virtual address structure;B. In the segment part, the address transformation is to convert the logical address into a line

The main content of Chinese aerospace Spaceos is The imitation of VxWorks653 (653 is the product name, not the version number) of the American Wind River system company.First explain why this system is not used with Linux:The spacecraft's memory and CPU are very weak, weak to what extent: the heavenly number of the CPU is 10MHz, memory is 2M, this configuration run Linux more laborious, although it is not impossible, but to crop the Linux kernel is really too troublesome.The fatal flaw of Linux

"In-depth understanding of computer Systems" Chapter III-Machine-level representation of the program. The author first explains the relationship between the assembly code and the machine code, expounds the function of the assembly link, then starts from the machine language IA32, describes how to store the data, how to access the data, how to complete the operation and how to jump. Through these steps, we a

Overview ● This chapter mainly describes the structure of the ELF File. ● Concept of static library ● The concept of a dynamic library (also called a shared library) is generally used in an operating system, and common applications do not play a major role. ● Program loading process. The explanation of the link in this book is not detailed enough. At the end of the chapter, the author admitted that there is no good record link in the

counter (Pc,program Counter).The operating codes that the processor can respond to (such as 1 0 h and h for loading and storage) are called machine codes, or machine languages. The term "language" is used because machine codes are similar to readable/writable human languages that can be understood and responded to by machines.The above represents a computer programming language, known as assembler. It is a

The purpose of this article is to summarize some things, solve the problem in the process of trying to construct a vulnerability database, that is how to classify the computer network vulnerabilities. Some of the ideas in this article are not mature, some even themselves are not satisfied with the right to make a point, in order to have in-depth research in this respect tongren exchanges, and improve the common. A

Seventh Chapter LinksA link is the process of collecting and combining various pieces of code and data into a single file that can be loaded (or copied) into memory and executed. A link can be executed at compile time, that is, when the source code is translated into machine code, or it can be executed at load time , that is, when the loader is loaded into storage and executed, or even executed at run time by the application. In an earlier computer sy

A link is a process that collects various code and data parts and combines them into a single file. This file can be loaded (or copied) to the memory and executed. The link can be executed during compilation, that is, when the source code is translated into machine code, or when the program is loaded into the memory and executed; it is even executed by the application at runtime. In early computer systems,

Original address: http://blog.csdn.net/slvher/article/details/9150597Memory management is a big challenge for C + + programmers, it is absolutely worth the cautious, otherwise it is painful to let the module of tens of thousands of lines of code run up before the memory crashes. Because the location of the crash is in time and space, it is usually shown after a distance from the real source of the error. A few days ago on-line module due to heap memory write out of 1 bytes caused by various stra

storage until the CPU is applied to a mapped virtual page for copying.7.10 Dynamic Link Shared libraryShared library is a modern innovation product that devotes to solving the defect of static library. A shared library is a target module that, at run time, can be loaded into any memory address and added to a program in memory to link it up. This process , called dynamic linking, is performed by a program called a dynamic linker. Shared libraries are also known as shared destinations, which are

"In-depth understanding of computer Systems", chapter seventhA link is the process of collecting and combining various pieces of code and data into a single file that can be loaded (or copied) into memory and executed.The timing of the link At compile time, that is, when the source code is translated into machine code When loaded, that is, when the program is loaded into storage and executed by

This article reprinted address : http://www.cnblogs.com/zuoxiaolong/p/computer4.htmlIntroductionConcurrency and parallelism have always been a hot word in the IT world, and I am sure you will never be unfamiliar to apes. In the computer system this book, concurrency and Parallelism is the interpretation that concurrency refers to a system with multiple activities at the same time, while parallel refers to the use of concurrency to make a system run fa

read and write, solve Processor-memory gap.* Storage Hierarchy System: A computer system consisting of a storage hierarchy with the fastest top, smallest capacity, and the highest cost per byte register, down to several levels of cache, memory, external memory, other system storage ... The entire system exists to match the performance of the CPU with the performance of the storage system at minimal cost.* OS is an over-layer between the application a

accessing main memory. Newer systems also have L3 caches, which are implemented using an SRAM-only hardware technology. In this way, the system can obtain a large piece of memory, and access speed is very fast.The program has a tendency to access data and code in the local area. Most of the memory operations are done in a fast cache by storing potentially frequently accessed data in the cache, and the program performance is greatly improved.operating

. Shared libraries are also known as shared destinations, which are typically represented by the. So suffix in Unix systems. Microsoft's operating system uses a large number of shared libraries, which are called DLLs (dynamic-link libraries). Shared libraries are "shared" in two different ways (called "implicit linking" and "Show link" in Windows, respectively).First, in any given file system, there

Memory ManagementIncludes memory management and virtual memory management. Memory management includes memory management concepts, exchange and coverage, continuous allocation management and non-contiguous allocation management methods (paging management, segmented management, and section-page management). Virtual memory management includes virtual memory concepts, request paging management, page replacement algorithms, page assignment policies, working sets, and jitter. 3.1 Concept of memory

First, von Neumann system Using binary Data and code are stored together Memory is a one-dimensional structure of linear programming accessed by address. Second, the computer five major partsOperator (CA), Controller (CC), Memory (M, memory + external memory), input device (I), output device (O)Third, the principle of computer operationIn the five parts, the controller-centric instruct