Operating system notes (11) virtual memory, operating system virtual memory
Virtual Memory
Demand paging
Page Replacement Algorithm
FIFO first-in-first-out
Optimal Replacement: the least used pages in the future. It is difficult to implement.
LRU: least recently used. The above approxima
Linux operating system basics, linux operating system
Basic Principles of Linux:
1. It is composed of a single small program with a single purpose; it is combined to complete complex tasks;
2. Everything is a file;
3. Avoid capturing user interfaces as much as possible; (Avoid interacting with users as much as possible
completion time of each job, the turnaround time and the turnaround time (turnover factor).2. Dynamic demonstration of each scheduling, update the current system time, in the running state and waiting for the corresponding information of each job (job name, arrival time, the desired run time, etc.) for the HRRN algorithm, can show each job response than R in each schedule.3. (*) allows users to submit new jobs during the impersonation process.4. (* *
wait I/O.
Solving method
L Exchange Technology: a part of the temporarily unable to run the process (blocking the process) to the external memory (only the program and data, the PCB does not change out), to make room for space, can invoke a new process to execute.
• Virtual Storage technology: Each process can only load part of the program and data
4. Suspend: The process is exchanged to the external memory, the state becomes suspended state
4.1 Cause of Process suspend (P91)
L Process all blo
Using C # To clear operating system logs is very simple, because. NET provides an EventLog class to encapsulate this complete function.
Using(EventLogEl =NewEventLog() {El. log ="Application"; El. Clear ();}
By default, the server has three log files: application, system, and security. ApplicationProgramAnd the Service uses the application log file. The device
Operating System Experiment Instruction book
Computer College of Yantai University
Operating System Course Group
2008-9-20
the first part of the operating system on the computer guidance
Linux
far-reaching.For the real-time operating system, we have already mentioned that in addition to meet the functional requirements of the application, it is more important to meet the real-time requirements of the application, and the many real-time tasks composed of an application for real-time requirements are different, in addition to real-time tasks may also have some complex association and synchronizati
My computer installed three systems, and one of them is not often used, so I want to uninstall it, online search, and finally found this uninstall operating system artifact--os-uninstaller.
Os-uninstaller provides a graphical interface to clear windows, MacOS, Ubuntu, and other operating systems, is powerful and easy to use, the author through the practice, succ
IntroductionProcess synchronization is an operating system level concept, in the context of multi-channel programs, there are different constraints, in order to coordinate this mutual restrictive relationship, the realization of resource sharing and process collaboration, so as to avoid conflicts between processes, the introduction of process synchronization.Critical ResourcesIn the
Operating System Technology for operating "core" strategizing-CMP2005-05-19
■ Dong yuanlin haoxiang, Department of Computer Science and Technology, Tsinghua University■ Wang Dongsheng, Tsinghua University Information Technology Research Institute, Li Peng
Single-chip multi-processor (CMP), especially the development of single-chip symmetric multi-processor (homog
Before installing the Linux operating system, you need to install a virtual machine software to simulate running Linux system under Windows system, this article has selected vmware7.0.
The installation steps are as follows:
1, first download VMware installation package.
2, will download the good installation package
Tags: Operating network CTI based on install Tor min win authOn the Windows system > If you do not want the user through the operating system authentication mode login, you can modify the Sqlnet.ora file, put sqlnet. Authentication_services=nts the front plus # comment out.
Using the Ucos real-time operating system is at school when the Mentor research project. At that time, the Internet to find the operating system porting tutorial and application tutorial according to gourd painting scoop, the function of implementation is just, not very deep to study this thing. Later work, idle to bor
Tags: path blank min Erro detail authentication method Sam font based onOn the Windows system > If you do not want the user through the operating system authentication mode login, you can modify the Sqlnet.ora file, put sqlnet. Authentication_services=nts the front plus # comment out. On Linux Systems > If you do not want users to log on by
system.Then, the user successfully logs on to the operating system.
Note that if your computer only has AdministratorThis user will be displayed on the welcome screen Administrator User item. If not only Administrator Users and other users that can log on interactively. The welcome screen only displays Administrator Other users without displaying Administrator User. If you want Administrator What shou
Introduction to operating systems, operating system concepts
A computer system can receive and store information according to human requirements. It can process and provide the required results. The results (output information) depend on the received information (input information) and corresponding processing methods.
Job:1. Write and debug routine subroutines that can realize various functions.2, write and debug the visit to the pipeline interrupt processing program.3, constructs the routine subroutine entry Address table.In the user program, a system call is scheduled where the operating system service needs to be requested. In this way, when the program executes to this com
When using Javascript to implement interaction between the client and the server, you sometimes need to judge the operating system to achieve compatibility under different operating systems. For example, we have a website, in Windows XP, the browsing effect is good, but in Ubuntu, due to many different features, it may cause slight differences in browsing, and ev
In multiple operating systems, how does one set the default Operating System? -- Debian information of the Linux release-the following is a detailed description. In other operating environments (linux and windows2 systems)
If debian or other linux versions are installed, you should set them in linux. Without a doubt
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