slides - Department of Computer Science
... uni-processor - keep track of number of temporary references to the object multi-processor – circulate a token among the processors that access this clustered object, a processor passes the token when it completes the uni-processor phase-2 ...
... uni-processor - keep track of number of temporary references to the object multi-processor – circulate a token among the processors that access this clustered object, a processor passes the token when it completes the uni-processor phase-2 ...
Module 3: Operating
... - easier to extend a microkernel - easier to port the operating system to new architectures - more reliable (less code is running in kernel mode) - more secure Ex. Mach: Maps UNIX system calls into appropriate user level services. ...
... - easier to extend a microkernel - easier to port the operating system to new architectures - more reliable (less code is running in kernel mode) - more secure Ex. Mach: Maps UNIX system calls into appropriate user level services. ...
VMware GSX Server - Boston Tech Partners
... large numbers of development and testing machine environments and multiple operating systems in server-based virtual machines instead of dedicated hosts. • Implement Departmental Server Consolidation. Consolidate applications and infrastructure services onto fewer highly scalable, highly reliable en ...
... large numbers of development and testing machine environments and multiple operating systems in server-based virtual machines instead of dedicated hosts. • Implement Departmental Server Consolidation. Consolidate applications and infrastructure services onto fewer highly scalable, highly reliable en ...
Introduction to Object Technology
... of one or more pages – Since the kernel needs small (smaller than a page) chunks of memory for short intervals,Linux uses slab allocation within an allocated page – Example: on a Pentium/x86 machine page size is 4 Kbytes and chunks can be allocated in sizes 32, 64, 128, 252, 508, 2040, and 4080 byte ...
... of one or more pages – Since the kernel needs small (smaller than a page) chunks of memory for short intervals,Linux uses slab allocation within an allocated page – Example: on a Pentium/x86 machine page size is 4 Kbytes and chunks can be allocated in sizes 32, 64, 128, 252, 508, 2040, and 4080 byte ...
Week 5 - Portland State University
... It must have the privilege to manipulate the hardware set base and limit registers for memory protection access devices set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do not have privilege to set it, how can they invoke the OS so that it can ru ...
... It must have the privilege to manipulate the hardware set base and limit registers for memory protection access devices set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do not have privilege to set it, how can they invoke the OS so that it can ru ...
chap03
... Identify a computer on the network Windows communicates the computer name to other computers on the subnet so it should be unique Name of computer is not related to how the computer is recognized on the Internet In Linux, the hostname can exist on more than computer, it only uses IP addresses for co ...
... Identify a computer on the network Windows communicates the computer name to other computers on the subnet so it should be unique Name of computer is not related to how the computer is recognized on the Internet In Linux, the hostname can exist on more than computer, it only uses IP addresses for co ...
Plan 9 from Bell Labs
... access to resources, even those, such as devices, not traditionally treated as files. For Plan 9, we adopted this idea by designing a network-level protocol, called 9P, to enable machines to access files on remote systems. Above this, we built a naming system that lets people and their computing age ...
... access to resources, even those, such as devices, not traditionally treated as files. For Plan 9, we adopted this idea by designing a network-level protocol, called 9P, to enable machines to access files on remote systems. Above this, we built a naming system that lets people and their computing age ...
ch1_OS
... A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to acce ...
... A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to acce ...
What is an OS? • Interface between application programs and
... – There are two or more processors of similar capability ∗ Any process and any thread can run on any available processor – Processors share the same memory and I / O, through a common communications bus, leading to same memory access time for each CPU – All processors share the same I / O devices, e ...
... – There are two or more processors of similar capability ∗ Any process and any thread can run on any available processor – Processors share the same memory and I / O, through a common communications bus, leading to same memory access time for each CPU – All processors share the same I / O devices, e ...
Protection A computer system is a collection of processes and
... big and empty the matrix would be, when we have a large no. of users (domains) and an even large no. of files, programs and other objects! Therefore, access matrixes are implemented in a variety of ways in different operating systems:● ...
... big and empty the matrix would be, when we have a large no. of users (domains) and an even large no. of files, programs and other objects! Therefore, access matrixes are implemented in a variety of ways in different operating systems:● ...
Linux Operating System
... There are a couple of special characters intercepted by the shell, bash. The character “”, an asterix, says “replace this word with all the files that will fit this specification”. So, the command cp data ˜/backup, like the one above, gets changed to cp data-new data 1 data 2 data 5 ˜/backup befor ...
... There are a couple of special characters intercepted by the shell, bash. The character “”, an asterix, says “replace this word with all the files that will fit this specification”. So, the command cp data ˜/backup, like the one above, gets changed to cp data-new data 1 data 2 data 5 ˜/backup befor ...
Architectural Support for Operating Systems
... • Typically written in a high-level language (C or C++) • Mostly accessed by programs using APIs • Three most common APIs: – Win32 API for Windows – POSIX API for POSIX-based systems (UNIX, Linux, Mac OS X) – Java API for the Java virtual machine (JVM) ...
... • Typically written in a high-level language (C or C++) • Mostly accessed by programs using APIs • Three most common APIs: – Win32 API for Windows – POSIX API for POSIX-based systems (UNIX, Linux, Mac OS X) – Java API for the Java virtual machine (JVM) ...
Report
... introduce system calls was University of Manchester’s Atlas I Supervisor. Some operating systems from the mid-1960s include: Atlas I Supervisor, DOS/360, Input Output Selector, and Master Control Program. Some operating systems from the late-1960s include: BPS/360, CAL, CHIPPEWA, EXEC 3, and EXEC 4 ...
... introduce system calls was University of Manchester’s Atlas I Supervisor. Some operating systems from the mid-1960s include: Atlas I Supervisor, DOS/360, Input Output Selector, and Master Control Program. Some operating systems from the late-1960s include: BPS/360, CAL, CHIPPEWA, EXEC 3, and EXEC 4 ...
ch18
... once the system call has completed and control is about to be returned to user mode 2. The second technique applies to critical sections that occur in an interrupt service routines – By using the processor’s interrupt control hardware to disable interrupts during a critical section, the kernel guara ...
... once the system call has completed and control is about to be returned to user mode 2. The second technique applies to critical sections that occur in an interrupt service routines – By using the processor’s interrupt control hardware to disable interrupts during a critical section, the kernel guara ...
col
... • Many bits about the current process • Mode bit is just one of them • Mode bit: • 0 = user mode = untrusted: “Privileged” instructions and registers are disabled by CPU • 1 = kernel mode = trusted All instructions and registers are enabled ...
... • Many bits about the current process • Mode bit is just one of them • Mode bit: • 0 = user mode = untrusted: “Privileged” instructions and registers are disabled by CPU • 1 = kernel mode = trusted All instructions and registers are enabled ...
資工系網媒所NEWS實驗室Chapter 13
... Performance depends on the number and types of requests. Requests for disk service can be influenced by the fileallocation method. The disk-scheduling algorithm should be written as a separate module of the operating system, allowing it to be replaced with a different algorithm if necessary. Either ...
... Performance depends on the number and types of requests. Requests for disk service can be influenced by the fileallocation method. The disk-scheduling algorithm should be written as a separate module of the operating system, allowing it to be replaced with a different algorithm if necessary. Either ...
What is an Operating System?
... • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the same time. • Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accu ...
... • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the same time. • Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accu ...
IPC
... • However, there are other types of file descriptors. For example, when you say write(1, buf, size), you are saying to print those bytes to standard output, which often is not a disk file, but instead is a terminal. When fd is the writing end of a pipe, the write() specifies for the operating system ...
... • However, there are other types of file descriptors. For example, when you say write(1, buf, size), you are saying to print those bytes to standard output, which often is not a disk file, but instead is a terminal. When fd is the writing end of a pipe, the write() specifies for the operating system ...
Network operating system comparison
... Network Operating Systems (NOSs) have gone far beyond their roots of file and print services. Other functions, such as communications, database, application, and management services, have become equally important in corporate environments. Companies using NOSs have found supporting large numbers of ...
... Network Operating Systems (NOSs) have gone far beyond their roots of file and print services. Other functions, such as communications, database, application, and management services, have become equally important in corporate environments. Companies using NOSs have found supporting large numbers of ...
OS_Java
... Recycle Bin, while Linux rm delete them instantly. Windows task manager allows us to kill processes with their program names, while Linux uses IDs to kill specific processes. Windows starts an appropriate application for a file double-clicked, while Linux needs a specific application to be typed fro ...
... Recycle Bin, while Linux rm delete them instantly. Windows task manager allows us to kill processes with their program names, while Linux uses IDs to kill specific processes. Windows starts an appropriate application for a file double-clicked, while Linux needs a specific application to be typed fro ...
No Slide Title
... concepts involved with operating systems, such as the basic definition involved in computer systems. Processes and Scheduling. This unit outlines some of the key concepts in the operation of an operating system, especially related to processes, and scheduling. Distributed Processing. This units outl ...
... concepts involved with operating systems, such as the basic definition involved in computer systems. Processes and Scheduling. This unit outlines some of the key concepts in the operation of an operating system, especially related to processes, and scheduling. Distributed Processing. This units outl ...
Notes for Lecture 12
... All rights reserved. Reproduction or translation of this work beyond that permitted in section 117 of the 1976 United States Copyright Act without express permission of the copyright owner is unlawful. Request for further information should be addressed to the Permissions Department, John Wiley & So ...
... All rights reserved. Reproduction or translation of this work beyond that permitted in section 117 of the 1976 United States Copyright Act without express permission of the copyright owner is unlawful. Request for further information should be addressed to the Permissions Department, John Wiley & So ...
Spring 2005 - Computer Science
... sources, those who copy source code from other students, and those students who knowingly or unknowingly allow other students to copy from them will be penalized with a zero on any homework assignments in which this occurs. Due dates for assignments will be enforced. Late assignments will be penaliz ...
... sources, those who copy source code from other students, and those students who knowingly or unknowingly allow other students to copy from them will be penalized with a zero on any homework assignments in which this occurs. Due dates for assignments will be enforced. Late assignments will be penaliz ...