Slides
... • text – code – section (program counter – PC) • stack section (stack pointer) • data section • set of open files currently used • set of I/O devices currently used ...
... • text – code – section (program counter – PC) • stack section (stack pointer) • data section • set of open files currently used • set of I/O devices currently used ...
CS307-slides02
... It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare ...
... It treats hardware and the operating system kernel as though they were all hardware. A virtual machine provides an interface identical to the underlying bare ...
The Linux Kernel and Acquiring Forensic Images of Hard Disks
... Hard disks normally store information in 512-byte sectors. Up through version 2.4, the Linux kernel would access data from the disk in blocks of 1024 bytes, or two sectors at a time. In general, the difference between block and sector sizes did not present a problem. If the disk had an odd number of ...
... Hard disks normally store information in 512-byte sectors. Up through version 2.4, the Linux kernel would access data from the disk in blocks of 1024 bytes, or two sectors at a time. In general, the difference between block and sector sizes did not present a problem. If the disk had an odd number of ...
Lab 1 – Using the File System through Windows Explorer
... 3. Directories/ Folders: files are organized into folders (also called directories) 4. File operations: operations which can be performed on files 5. File attributes: characteristics that describe a file 6. Directory/folder operations: operations that can be performed on folders/directories 7. Paths ...
... 3. Directories/ Folders: files are organized into folders (also called directories) 4. File operations: operations which can be performed on files 5. File attributes: characteristics that describe a file 6. Directory/folder operations: operations that can be performed on folders/directories 7. Paths ...
ch02-OS-Structures
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Figure 5.01
... It is more economical to create and context-switch threads. For example, in Solaris, creating a process is 30 times slower than creating a thread, and context switching a process is 5 times slower than context switching a thread ...
... It is more economical to create and context-switch threads. For example, in Solaris, creating a process is 30 times slower than creating a thread, and context switching a process is 5 times slower than context switching a thread ...
Operating Systems CSE 411 CPU Management Sept. 20 2006 - Lecture 7
... • What does the scheduler have to do – When a new process arrives? – When a process terminates? ...
... • What does the scheduler have to do – When a new process arrives? – When a process terminates? ...
PPT
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
VirtuOS: an operating system with kernel virtualization
... Architectural approaches for increasing the reliability of kernel software and reducing the impact of faults often rely on decomposition. Microkernel-based system design moves device drivers and other system critical code from the kernel into separate user space processes. Microkernels have been suc ...
... Architectural approaches for increasing the reliability of kernel software and reducing the impact of faults often rely on decomposition. Microkernel-based system design moves device drivers and other system critical code from the kernel into separate user space processes. Microkernels have been suc ...
cs320ch3powerpoint
... • One aspect of scheduling is system driven, not policy driven: Interrupts force a change in what job is running • Aside from handling interrupts as they occur, it is O/S policy, the scheduling algorithm, that determines what job is scheduled • The O/S maintains data structures, including PCB’s, wh ...
... • One aspect of scheduling is system driven, not policy driven: Interrupts force a change in what job is running • Aside from handling interrupts as they occur, it is O/S policy, the scheduling algorithm, that determines what job is scheduled • The O/S maintains data structures, including PCB’s, wh ...
Operating_system_5
... additional milliseconds (RR). If it still does not complete, it is preempted and moved to queue Q2. – AT Q2 job is served FCFS ...
... additional milliseconds (RR). If it still does not complete, it is preempted and moved to queue Q2. – AT Q2 job is served FCFS ...
Synchronization
... 1. No two processes may be simultaneously inside their critical sections. 2. No assumptions may be made about speed or number of CPUs. 3. No process running outside its critical section may block other processes. 4. No process should have to wait forever to enter its critical section. CSC 660: Advan ...
... 1. No two processes may be simultaneously inside their critical sections. 2. No assumptions may be made about speed or number of CPUs. 3. No process running outside its critical section may block other processes. 4. No process should have to wait forever to enter its critical section. CSC 660: Advan ...
Processes and threads
... Solaris (versions < 9) had both user-level and system-level threads. LWP – light-weight process (what we have been calling system-level threads) Kernel threads – active within the kernel Each LWP is associated with one kernel thread. ...
... Solaris (versions < 9) had both user-level and system-level threads. LWP – light-weight process (what we have been calling system-level threads) Kernel threads – active within the kernel Each LWP is associated with one kernel thread. ...
The Essence of UNIX and Linux
... Introducing UNIX/Linux Shells • Shell: program that interprets commands you enter from keyboard – Bourne shell, developed by S. Bourne (AT&T Bell Labs), was the first UNIX command processor – Another Bell employee developed the Korn shell • History feature ...
... Introducing UNIX/Linux Shells • Shell: program that interprets commands you enter from keyboard – Bourne shell, developed by S. Bourne (AT&T Bell Labs), was the first UNIX command processor – Another Bell employee developed the Korn shell • History feature ...
Scheduling
... • Weighted Round Robin - each process is given some number of time slices, not just one per round • this is a way to provide preferences or priorities even with preemptive time slicing ...
... • Weighted Round Robin - each process is given some number of time slices, not just one per round • this is a way to provide preferences or priorities even with preemptive time slicing ...
Module 4: Processes
... What is not a process? -- program on a disk - a process is an active object, but a program is just a file ...
... What is not a process? -- program on a disk - a process is an active object, but a program is just a file ...
資工系網媒所NEWS實驗室
... One purpose of OS is to hide peculiarities of hardware devices from the user I/O subsystem responsible for Memory management of I/O including buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlappi ...
... One purpose of OS is to hide peculiarities of hardware devices from the user I/O subsystem responsible for Memory management of I/O including buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spooling (the overlappi ...
9-SystemSoftware - Systems and Computer Engineering
... – It takes far less time to create a new thread in an existing process than to create a brand-new process (Unix, factor of 10) – It takes less time to terminate a thread – It takes less time to switch between two threads within the same process – They also enhance communication efficiency between di ...
... – It takes far less time to create a new thread in an existing process than to create a brand-new process (Unix, factor of 10) – It takes less time to terminate a thread – It takes less time to switch between two threads within the same process – They also enhance communication efficiency between di ...
Hardware architecture of a Real Time Operating System
... (maximum 6) and ReadyQLST (maximum 4) as specified in the design of the system control block SCBST. The CPU scheduler process of real-time operating system, CPUSchedulerPC, dispatches a maximum of ten processes in both ready queues ReadyQHST and ReadyQLST within a low interrupt period 10ms, where ea ...
... (maximum 6) and ReadyQLST (maximum 4) as specified in the design of the system control block SCBST. The CPU scheduler process of real-time operating system, CPUSchedulerPC, dispatches a maximum of ten processes in both ready queues ReadyQHST and ReadyQLST within a low interrupt period 10ms, where ea ...
Transparency in Distributed Systems
... 4. Replication Transparency: This kind of transparency should be mainly incorporated for the distributed file systems, which replicate the data at two or more sites for more reliability. The client generally should not be aware that a replicated copy of the data exists. The clients should also expe ...
... 4. Replication Transparency: This kind of transparency should be mainly incorporated for the distributed file systems, which replicate the data at two or more sites for more reliability. The client generally should not be aware that a replicated copy of the data exists. The clients should also expe ...
project2 - 408 Coding School
... Part I –Iterating over Tasks Linearly Design a kernel module that iterates through all tasks in the system using the for each process() macro. In particular, output the task name (known as executable name), state, and process id of each task. Follow the instructions on the textbook and do the follow ...
... Part I –Iterating over Tasks Linearly Design a kernel module that iterates through all tasks in the system using the for each process() macro. In particular, output the task name (known as executable name), state, and process id of each task. Follow the instructions on the textbook and do the follow ...