Operating Systems
... Magnetic disks provide bulk of secondary storage of modern computers – Drives rotate at 60 to 200 times per second – Transfer rate is rate at which data flow between drive and computer – Positioning time (random-access time) is time to move disk arm to desired cylinder (seek time) and time for desir ...
... Magnetic disks provide bulk of secondary storage of modern computers – Drives rotate at 60 to 200 times per second – Transfer rate is rate at which data flow between drive and computer – Positioning time (random-access time) is time to move disk arm to desired cylinder (seek time) and time for desir ...
Netscape: System Commander in Patagonia
... selectively on the same Machine (as a major technical university we have generous site licensing agreements, so the doubled software cost is not an issue). Also the original and nationalized versions of most application programs can not be installed concurrently and therefore the Patagonia cluster f ...
... selectively on the same Machine (as a major technical university we have generous site licensing agreements, so the doubled software cost is not an issue). Also the original and nationalized versions of most application programs can not be installed concurrently and therefore the Patagonia cluster f ...
AutoPod: Unscheduled System Updates with Zero Data Loss
... The key pod virtualization mechanisms used are a system call interposition mechanism and the chroot utility with file system stacking to provide each pod with its own file system namespace that can be separate from the regular host file system. Pod virtualization support for migration is based on Zap [ ...
... The key pod virtualization mechanisms used are a system call interposition mechanism and the chroot utility with file system stacking to provide each pod with its own file system namespace that can be separate from the regular host file system. Pod virtualization support for migration is based on Zap [ ...
Operating Systems
... – a dormant context set up for each routine which can be activated on demand – further interrupts usually switched off during initial interrupt servicing ...
... – a dormant context set up for each routine which can be activated on demand – further interrupts usually switched off during initial interrupt servicing ...
Operating System Organization Purpose of an OS
... use of resources •Processor Modes - hardware mode bit is used to distinguish between OS and user instructions •Kernels - most critical part of OS placed in kernel (trusted software module) •Method of invoking system service - calling a system function or sending a message to a system process ...
... use of resources •Processor Modes - hardware mode bit is used to distinguish between OS and user instructions •Kernels - most critical part of OS placed in kernel (trusted software module) •Method of invoking system service - calling a system function or sending a message to a system process ...
2007-06.pdf
... Creating a software drive is nothing but creating the means such that other tools can access data as if it where placed on a real drive. The equivalent in UNIX is actually creating a mount point. 7b What does mounting the CD ISO image actually establish in Windows? By mounting the ISO image, we have ...
... Creating a software drive is nothing but creating the means such that other tools can access data as if it where placed on a real drive. The equivalent in UNIX is actually creating a mount point. 7b What does mounting the CD ISO image actually establish in Windows? By mounting the ISO image, we have ...
Section 3A: Windows forensics
... Exploring Microsoft File Structures • Disk space is allocated by cluster • Results in drive slack • If you create a 5000 byte Word file then on a FAT 16 1.6 GB disk then the OS reserves 1 cluster • However in FAT 16 32,000 bytes allocated to your file = 27,000 file slack • 5000 byte file uses 10 se ...
... Exploring Microsoft File Structures • Disk space is allocated by cluster • Results in drive slack • If you create a 5000 byte Word file then on a FAT 16 1.6 GB disk then the OS reserves 1 cluster • However in FAT 16 32,000 bytes allocated to your file = 27,000 file slack • 5000 byte file uses 10 se ...
A Five-State Process Model (Review) The not
... When OS is ready to execute a waiting process, it loads the hardware registers (PC, SP, etc.) with the values stored in the new process’ PCB, and restores any ...
... When OS is ready to execute a waiting process, it loads the hardware registers (PC, SP, etc.) with the values stored in the new process’ PCB, and restores any ...
資工系網媒所NEWS實驗室
... Single user cannot keep CPU and I/O devices busy at all times Multiprogramming organizes jobs (code and data) so CPU always has one to execute A subset of total jobs in system is kept in memory One job selected and run via job scheduling When it has to wait (for I/O for example), OS switches to anot ...
... Single user cannot keep CPU and I/O devices busy at all times Multiprogramming organizes jobs (code and data) so CPU always has one to execute A subset of total jobs in system is kept in memory One job selected and run via job scheduling When it has to wait (for I/O for example), OS switches to anot ...
Interrupts - Matthew L. Wright
... – Loads memory bus as data are copied between controllers, buffers, and memory locations • To improve I/O efficiency, we can: – Reduce the number of context switches. – Reduce the number of times that data must be copied in memory while passing between device and application. – Reduce the frequency ...
... – Loads memory bus as data are copied between controllers, buffers, and memory locations • To improve I/O efficiency, we can: – Reduce the number of context switches. – Reduce the number of times that data must be copied in memory while passing between device and application. – Reduce the frequency ...
ch11.pdf
... When the file is deleted, its disk space is added to the FSL. FSL implementation in two methods: ...
... When the file is deleted, its disk space is added to the FSL. FSL implementation in two methods: ...
Operating Systems
... —Memory split into two —One for Operating System (monitor) —One for currently executing program ...
... —Memory split into two —One for Operating System (monitor) —One for currently executing program ...
Lecture-2
... API converts symbolic names of services to these numbers The system call interface invokes intended system call in OS ...
... API converts symbolic names of services to these numbers The system call interface invokes intended system call in OS ...
CS 519 Operating Systems Theory Spring 1998
... client-server model, IPC between clients and servers the micro-kernel provides protected communication OS functions implemented as user-level servers flexible but efficiency is the problem easy to extend for distributed systems University of Maryland, CMSC 412, Fall 2002 ...
... client-server model, IPC between clients and servers the micro-kernel provides protected communication OS functions implemented as user-level servers flexible but efficiency is the problem easy to extend for distributed systems University of Maryland, CMSC 412, Fall 2002 ...
ch04 - Computer Science
... programs available in similar versions for multiple platforms. Mac users can buy software emulation programs that: Create a simulated Windows machine in the Mac Translate all Windows-related instructions to Mac equivalents Future applications may be tied to networks rather than to desktop pl ...
... programs available in similar versions for multiple platforms. Mac users can buy software emulation programs that: Create a simulated Windows machine in the Mac Translate all Windows-related instructions to Mac equivalents Future applications may be tied to networks rather than to desktop pl ...
System Calls
... into registers or to a block Step 3: TARP is executed The state of the user process is saved T he system call number / read_code for read is sent to system call handler This code/number tells the OS what system call handler (kernel code) to execute This causes a switch from the user mode to ...
... into registers or to a block Step 3: TARP is executed The state of the user process is saved T he system call number / read_code for read is sent to system call handler This code/number tells the OS what system call handler (kernel code) to execute This causes a switch from the user mode to ...
CHAPTER 1: Computer Systems
... 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 ...
Operating Systems
... commands and information to the I/O device and read those locations to get information and status from the I/O device. Memory-mapped I/O makes it easy to write device drivers in a high-level language as long as the high-level language can load and store from arbitrary addresses. ...
... commands and information to the I/O device and read those locations to get information and status from the I/O device. Memory-mapped I/O makes it easy to write device drivers in a high-level language as long as the high-level language can load and store from arbitrary addresses. ...
csci19f2
... scan and the other for new requests during the scan • When a scan begins, all new requests are in one of the queues, with the other being empty • During the scan, all new requests are put into the queue that was initially empty • Thus, service of new requests is deferred until all the old requests h ...
... scan and the other for new requests during the scan • When a scan begins, all new requests are in one of the queues, with the other being empty • During the scan, all new requests are put into the queue that was initially empty • Thus, service of new requests is deferred until all the old requests h ...
I/O Management and Disk Scheduling
... Input transfers are made a block at a time When transfer is complete, the block is moved to user space when needed Another block is moved into the buffer – a.k.a Read ahead User process can process one block of data while next block is read in Swapping can occur since input is taking place in system ...
... Input transfers are made a block at a time When transfer is complete, the block is moved to user space when needed Another block is moved into the buffer – a.k.a Read ahead User process can process one block of data while next block is read in Swapping can occur since input is taking place in system ...