The correct option is (b)
A page out operation moves a page from memory to the backing store.
What is page in and out?
- Your computer's "memory" is made up of a fixed quantity of RAM. By enabling additional data to be saved on the hard drive, also referred to as Virtual Memory, it simulates having more RAM.
- It divides your memory into "pages" to do this. Applications that require memory-based data access call the data by page.
- A "page in" occurs when an application calls a page that is already loaded in RAM.
- A "Page Out" occurs if an app requests a page from memory but the page is now saved on the hard drive and needs to be read back into the RAM.
- A "Page-out" slows down system performance since it must first read data from a hard disk into RAM rather than reading directly from RAM.
- Performance on hard disks is slow because it takes 300 times longer to transport a page of data.
- Page-outs exceeding page-ins indicates that your RAM needs to be increased. Page-outs should ideally represent fewer than 20% of page-ins.
- The only ways to decrease page-outs are by adding more RAM or by fewer open programs. More RAM is the only rational option, even though using fewer, smaller files and apps may help free up memory.
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