IPC's indirect message forwarding may use process address space mailboxes (or in the kernel). Process address space is a shared-memory region. Indirect message forwarding and shared memory use process address space, so what's the difference?
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- It is possible to store a mailbox in the process address space when using the indirect message forwarding paradigm of IPC (or in the kernel). An analogous shared-memory architecture is one in which a shared-memory area is located inside the address space of the process. What is the difference between the indirect message passing and shared memory models, taking into account both of the facts (that they both utilize process address space), is unclear.A mailbox could be in the process address space when using the indirect message forwarding feature of IPC (or in the kernel). The shared memory region is in the process address space in the shared memory paradigm. Given that both use process address space, what distinguishes shared memory from indirect message forwarding?In indirect message passing model of IPC, a mailbox can be held in the process address space (or in the kernel). Similarly, in shared-memory model, a shared-memory region resides in the address space of the process. Considering both the facts (that both use process address space), what’s the difference between the indirect message passing and shared memory models?
- What is the purpose of the trampoline page? Why do both kernel address space and user process address space map the trampoline page to the same virtual address?In indirect message forwarding, process address space holds a mailbox (or in the kernel). Shared-memory areas are in the process's address space under the shared-memory paradigm. Given that both models use process address space, what differentiates them?Differentiate between • Symbolic, relocatable, and absolute addresses are the three types of addresses. • Dynamic loading and connection
- Suppose the OS on your computer uses the Buddy system for memory management. Initially the system has a 1 megabyte (1024K) block of memory available. Show the result of each request/release via successive figures similar to the one illustrated in the lecture slides. A: Request 25 K B: Request 500 K C: Request 70 K D:Request 100 K E: Request 40 K Release A F: Request 20 K Release B After memory is allocated to process F, how much internal fragmentation exist in the system.Give one scenario when you prefer to use memory sharing as a means of IPC. Explain why? How can you resolve the issue that could occur if the mailbox is used to communicate between three processes P1, P2 and P3, given one message is kept in the mailbox by the sender?There are two basic approaches to the design of OS kernel. One is called microkernel approach, and the other is called ___ approach. In xv6, how many stacks are allocated for each process currently residing in the system? The PCB of a process in xv6 contains a pointer to the PCB of its parent process. The variable name of this pointer is ___. In xv6, there is a user-level C program that is used to create the first user process. The file name of this program is _______. Each system call in xv6 is associated with a system call ID (an integer number). The ID for system call read() is ______.
- A disadvantage of ULTs is that when a ULT executes a system call, not only is that thread blocked, but also all of the threads within the process are blocked. Why is that so?if ten threads are running within a program and one of them request I/O and blocks in the kernel, what will happen to the rest of the threads if they are: A kernel managed B user managed what will happen if the same task is accomplished using multitasking rather than multithreading?Suppose the OS on your computer uses the Buddy system for memory management. Initially the system has a 1 megabyte (1024K) block of memory managment Show the result of each request. A: Request 25 K B: Request 500 K C: Request 70 K D:Request 100 K E: Request 40 K Release A F: Request 20 K Release B After memory is allocated to process F, how much internal fragmentation exist inthe system. (Subject:operating system )