What is an Operating System?
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
1) Routine is not loaded until it is called. All routines are kept on disk
... 39) Virtual memory is __________. 1 An extremely large main memory 2 An extremely large secondary memory 3 An illusion of extremely large main memory 4 A type of memory used in super computers. ...
... 39) Virtual memory is __________. 1 An extremely large main memory 2 An extremely large secondary memory 3 An illusion of extremely large main memory 4 A type of memory used in super computers. ...
Operating Systems
... memory control info, etc.) transparently to user process. Note on terminology. It’s common to use ‘process’ for task with independent address space, espec. in Unix setting, but this is not a universal definition. Tasks sharing the same address space are called ‘tasks’ (IBM) or ‘threads’ (Unix). But ...
... memory control info, etc.) transparently to user process. Note on terminology. It’s common to use ‘process’ for task with independent address space, espec. in Unix setting, but this is not a universal definition. Tasks sharing the same address space are called ‘tasks’ (IBM) or ‘threads’ (Unix). But ...
Solutions - Philadelphia University Jordan
... Question 3:Describe the three general methods used to pass parameters to the operating system during system calls. 3 points 1- pass the parameters in registers which is useful if the amount of data is small and can be fit in register. This method is fast but can pass large amount of data. 2- parame ...
... Question 3:Describe the three general methods used to pass parameters to the operating system during system calls. 3 points 1- pass the parameters in registers which is useful if the amount of data is small and can be fit in register. This method is fast but can pass large amount of data. 2- parame ...
Lecture 2 Processes and Threads
... Additional example with the asynchrony problem Two threads need to write to the display. The first thread starts to build its request, but before it finishes a time-slice switch occurs and the second thread starts its request. The combination of the two threads issues a forbidden request sequence ...
... Additional example with the asynchrony problem Two threads need to write to the display. The first thread starts to build its request, but before it finishes a time-slice switch occurs and the second thread starts its request. The combination of the two threads issues a forbidden request sequence ...
Introduction to Object Technology
... • usually based on the position of the requested sector rather than according to the process priority • shortest-service-time-first (SSTF): pick the request that requires the least movement of the head • SCAN (back and forth over disk): good distribution • C-SCAN(one way with fast return):lower serv ...
... • usually based on the position of the requested sector rather than according to the process priority • shortest-service-time-first (SSTF): pick the request that requires the least movement of the head • SCAN (back and forth over disk): good distribution • C-SCAN(one way with fast return):lower serv ...
File - You have to dream before your dreams can come
... Cache misses have to go to memory, with a considerable time penalty. Cache memory is limited in size due to its high cost. Some machines have two or even three levels of cache, each one slower and bigger than the one before it. Caching plays a main role in various areas of computer science, not ju ...
... Cache misses have to go to memory, with a considerable time penalty. Cache memory is limited in size due to its high cost. Some machines have two or even three levels of cache, each one slower and bigger than the one before it. Caching plays a main role in various areas of computer science, not ju ...
MIDTERM #1 WITH SOLUTIONS - School of Computer Science
... 22. Which of the following pieces of information is least useful to the SYSGEN program of an operating system? A) the CPU being used B) amount of memory available C) what applications to install D) operating-system options such as buffer sizes or CPU scheduling algorithms ...
... 22. Which of the following pieces of information is least useful to the SYSGEN program of an operating system? A) the CPU being used B) amount of memory available C) what applications to install D) operating-system options such as buffer sizes or CPU scheduling algorithms ...
What is an Operating System?
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
Operating System Support for Virtual Machines
... – Denali supports only some instructions. – Microkernel provides high-level services that are not provided by ...
... – Denali supports only some instructions. – Microkernel provides high-level services that are not provided by ...
ch9
... Hole – variable size block of available memory new process is allocated memory from a hole Operating system maintains information about: a) allocated partitions b) free partitions (holes) ...
... Hole – variable size block of available memory new process is allocated memory from a hole Operating system maintains information about: a) allocated partitions b) free partitions (holes) ...
OPERATING SYSTEM 1. What are the advantages of spooling? The
... So, total logical address space =28 * 210 = 218 bytes For 218 byte address space – 18 bit address is required 35. Explain the comparison of demand paging with segmentation? Sr.no ...
... So, total logical address space =28 * 210 = 218 bytes For 218 byte address space – 18 bit address is required 35. Explain the comparison of demand paging with segmentation? Sr.no ...
operating systems memory management
... Used by hardware diagnostics, by system boot code, real time/dedicated systems. logical == physical User can have complete control. Commensurably, the operating system has none. DEFINITION OF PARTITIONS: Division of physical memory into fixed sized regions. (Allows addresses spaces to be distinct = ...
... Used by hardware diagnostics, by system boot code, real time/dedicated systems. logical == physical User can have complete control. Commensurably, the operating system has none. DEFINITION OF PARTITIONS: Division of physical memory into fixed sized regions. (Allows addresses spaces to be distinct = ...
Mem_Mgmt
... Used by hardware diagnostics, by system boot code, real time/dedicated systems. logical == physical User can have complete control. Commensurably, the operating system has none. ...
... Used by hardware diagnostics, by system boot code, real time/dedicated systems. logical == physical User can have complete control. Commensurably, the operating system has none. ...
Slide
... • Recent CPU x86 virtualization instructions for a hypervisor to control ring0 hardware access – Create a new ”Ring -1” – Guest OS can run Ring0 operations natively without affecting other guests or the host OS – both Intel's "Vanderpool" (or VT) and AMD's "Pacifica" (AMD-V) ...
... • Recent CPU x86 virtualization instructions for a hypervisor to control ring0 hardware access – Create a new ”Ring -1” – Guest OS can run Ring0 operations natively without affecting other guests or the host OS – both Intel's "Vanderpool" (or VT) and AMD's "Pacifica" (AMD-V) ...
lecture1
... the kernel. Some older operating systems had a rendezvous style of providing these services - the process would request a service and wait at a particular point, until a kernel task came along and serviced the request on behalf of the process. UNIX works very differently. Rather than having kernel t ...
... the kernel. Some older operating systems had a rendezvous style of providing these services - the process would request a service and wait at a particular point, until a kernel task came along and serviced the request on behalf of the process. UNIX works very differently. Rather than having kernel t ...
Lecture #19: Storage Management
... servicing requests until it gets to the other end of the disk, where the head movement is reversed and servicing continues. Sometimes called the elevator algorithm. Illustration shows total head movement of 208 cylinders. ...
... servicing requests until it gets to the other end of the disk, where the head movement is reversed and servicing continues. Sometimes called the elevator algorithm. Illustration shows total head movement of 208 cylinders. ...
Introduction
... clearly a storage device. However, there are also common cases where such a distinction cannot be made easily. For example, a removable diskette can be viewed as storage, but it also can be used as an I/O device when moving information between different systems. From an operating system’s perspectiv ...
... clearly a storage device. However, there are also common cases where such a distinction cannot be made easily. For example, a removable diskette can be viewed as storage, but it also can be used as an I/O device when moving information between different systems. From an operating system’s perspectiv ...
Chapter 1
... and programs, and its data are lost when power is lost, the computer system must provide secondary storage to back up main memory. Secondary storage consists of tapes, disks, and other media designed to hold information that will eventually be accessed in primary storage. Storage is ordinarily divid ...
... and programs, and its data are lost when power is lost, the computer system must provide secondary storage to back up main memory. Secondary storage consists of tapes, disks, and other media designed to hold information that will eventually be accessed in primary storage. Storage is ordinarily divid ...
Spooling
... When a process that does not have enough frames then it will quickly page faults, at this point it must replace some page. However since all pages are in active use, it must replace a page that will be needed again and also it quickly faults again, and again. This process continues to fault, replaci ...
... When a process that does not have enough frames then it will quickly page faults, at this point it must replace some page. However since all pages are in active use, it must replace a page that will be needed again and also it quickly faults again, and again. This process continues to fault, replaci ...
Operating System Architecture
... – the memory manager must also keep track of those memory areas no longer occupied ...
... – the memory manager must also keep track of those memory areas no longer occupied ...
operating systems io systems
... – flash media must be erased before it can be written to – unit of erase is a block, typically 64-256 pages long • usually takes 1-2ms to erase a block • blocks can only be erased a certain number of times before they become unusable – typically 10,000 – 1,000,000 times ...
... – flash media must be erased before it can be written to – unit of erase is a block, typically 64-256 pages long • usually takes 1-2ms to erase a block • blocks can only be erased a certain number of times before they become unusable – typically 10,000 – 1,000,000 times ...
Hold and wait
... The dispatcher is the module that gives control of the CPU to the process selected by the short-term scheduler. This function involves the following switching context, switching to user mode and jumping to the proper location in the user program to restart that program. ...
... The dispatcher is the module that gives control of the CPU to the process selected by the short-term scheduler. This function involves the following switching context, switching to user mode and jumping to the proper location in the user program to restart that program. ...