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What is a job pool & virtual memory?

The concept of the job pool states that a newly created process is stored in a pool called a job pool, where these processes wait for the resources to get allocated in order to get executed. 3. Virtual Memory represents the address generated by the CPU virtually. ...

What is a virtual address in a CPU?

The memory addresses generated by the CPU are called virtual addresses to distinguish them from the physical addresses used by main memory. In between the CPU and main memory there’s a new piece of hardware called the memory management unit (MMU). The MMU’s job is to translate virtual addresses to physical addresses. “But wait!” you say. ...

How does a virtual memory system work?

Here’s how our virtual memory system will work. The memory addresses generated by the CPU are called virtual addresses to distinguish them from the physical addresses used by main memory. In between the CPU and main memory there’s a new piece of hardware called the memory management unit (MMU). ...

What is virtual memory?

Virtual memory is a memory management technique in the operating system that gives users the illusion that they are working with memory that is equal to the memory of secondary storage medium ( that is very large memory). Thus, this allows a programmer to write a program that requires more memory than the actual memory. ...

What happens if a virtual address is not resident in physical memory?

If the virtual address in NOT resident in physical memory, the MMU signals a page fault exception, forcing the CPU to switch execution to special code called the page fault handler. The handler allocates a physical page to hold the requested virtual page and loads the virtual page from secondary storage into main memory. ...

What happens if a virtual page is not in main memory?

If the requested virtual page is NOT resident in main memory, the MMU signals a memory-management exception, called a page fault, to the CPU so it can load the appropriate page from secondary storage and set up the appropriate mapping in the MMU. ...