In most multiprogrammed systems, user programs access memory through virtual addresses, while the operating system uses...
In most multiprogrammed systems, user programs access memory through virtual addresses, while the operating system uses raw physical addresses to access memory. What are the implications of this design on the initiation of I/O operations by the user program and their execution by the operating system?
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In most multiprogrammed systems, user programs access memory
through virtual addresses, while the operating system uses...
The VAX/ VMS operating system makes use of four processor access modes to facili-tate the protection...
The VAX/ VMS operating system makes use of four processor access modes to facili-tate the protection and sharing of system resources among processes. The access mode determines:• Instruction execution privileges: What instructions the processor may execute• Memory access privileges: Which locations in virtual memory the current instruc-tion may access The four modes are as follows:• Kernel: Executes the kernel of the VMS operating system, which includes memo-ry management, interrupt handling, and I/ O operations• Executive: Executes many of the operating...
Four modes vs. two modes of operationg systems (kernel / user)
The VAX/ VMS operating system makes use of four processor access modes to facili-tate the protection and sharing of system resources among processes. The accessmode determines:• Instruction execution privileges: What instructions the processor may execute• Memory access privileges: Which locations in virtual memory the current instruc-tion may accessThe four modes are as follows:• Kernel: Executes the kernel of the VMS operating system, which includes memo-ry management, interrupt handling, and I/ O operations• Executive: Executes many of the operating system service...
Computer architecture rence1 (Choone) D Question 21 Regarding the virtual memory system, check all the statements...
Computer
architecture
rence1 (Choone) D Question 21 Regarding the virtual memory system, check all the statements that are true. Each program has its own page table, A program's memory space must be a contiguous physical addresses in the RAM, The user program is responsible for maintaining its own page table, If a computer has 1 GB RAM, the software can be written to use 2 GB of memory. It enables multiple programs to share the computer's memory, each program can...
In a virtual memory system, the I/O operations executed by a user program can be of...
In a virtual memory system, the I/O operations executed by a user program can be of two different types. Name them and explain when each one of them occurs.
In a virtual memory system, the I/O operations executed by a user program can be of...
In a virtual memory system, the I/O operations executed by a user program can be of two different types. Name them and explain when each one of them occurs.
16 It is known that computer system programs use 32-bit virtual addresses to access storage units....
16 It is known that computer system programs use 32-bit virtual addresses to access storage units. If the physical memory space of the computer system is 1GB, and the paging management mechanism is adopted, the page size is 4KB, and each page table entry is 4B. If only one level of page table is used to realize the mapping from virtual address to physical address, how much memory space does the page table occupy? A. 1MB B. 4KB C. 1KB...
4. A multi-programmed operating system running on a single CPU assigns time slices of CPU time to the virtual machines that run the individual programs. Each virtual machine is given access to th...
4. A multi-programmed operating system running on a single CPU assigns time slices of CPU time to the virtual machines that run the individual programs. Each virtual machine is given access to the CPU for a certain time (the time slice), during which it will continue to execute its program. The next time slice then goes to another virtual machine, and so on. Assume that each time slice is one millisecond (1/1000 of a second) long and the computer on...
For the efficient memory management and to avoid errors modern systems uses secondary memory as a...
For the efficient memory management and to avoid errors modern systems uses secondary memory as a part of the main memory known as a virtual memory. When a computer system is running serval programs at the same time, the main memory often becomes exhausted. In such circumstances instead of closing some programs the operating system use the secondary memory as part of the main memory to store some data. In short virtual memory is an elegant interaction of hardware exceptions,...
Consider a demand-paging system with a paging disk that has an average access and transfer time of 20 milliseconds. Addresses are translated through a page table in main memory, with an access time of...
Consider a demand-paging system with a paging disk that has an average access and transfer time of 20 milliseconds. Addresses are translated through a page table in main memory, with an access time of 1 microsecond per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added an associative memory that reduces access time to one memory reference, if the page-table entry is in the associative memory. Assume that 80...
Systems Architecture 7--> By default, what do most file management and operating do when a user...
Systems Architecture 7--> By default, what do most file management and operating do when a user deletes a file? A) mark the storage allocation unit as free and the directory entry as unused B) overwrite all allocated storage with spaces or other null content C) Remove the entry from secondary storage D) Mark the directory entry as used 8--> Linux file access control types include________ A) read, write and change B) read, modify and list C) read, write and execute...
Computer
architecture
rence1 (Choone) D Question 21 Regarding the virtual memory system, check all the statements that are true. Each program has its own page table, A program's memory space must be a contiguous physical addresses in the RAM, The user program is responsible for maintaining its own page table, If a computer has 1 GB RAM, the software can be written to use 2 GB of memory. It enables multiple programs to share the computer's memory, each program can...
4. A multi-programmed operating system running on a single CPU assigns time slices of CPU time to the virtual machines that run the individual programs. Each virtual machine is given access to the CPU for a certain time (the time slice), during which it will continue to execute its program. The next time slice then goes to another virtual machine, and so on. Assume that each time slice is one millisecond (1/1000 of a second) long and the computer on...
For the efficient memory management and to avoid errors modern systems uses secondary memory as a part of the main memory known as a virtual memory. When a computer system is running serval programs at the same time, the main memory often becomes exhausted. In such circumstances instead of closing some programs the operating system use the secondary memory as part of the main memory to store some data. In short virtual memory is an elegant interaction of hardware exceptions,...
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