What is Swap in and Swap Out

Dear team,

Just want to know Swap in and speak in simple English.

concerning

Mr. VMware

When you load a file or a program, the file is stored in the memory (RAM). RAM being finished, some files may not hold onto it. These files are stored in a special section of the hard drive called the "swap file." swapping is a mechanism in which a process can be temporarily swapped out of memory to a backing store (Swap OUt) and then brought into memory for execution continues. (Swap to). In other words , when the amount of physical memory (RAM) is full. If the system (say a process) needs of more memory resources and RAM is full, inactive memory pages are moved to the swap space (part of the hard drive) & these inactive pages will be directed towards more execution.

little more detail:

Assume that there is a situation where a process needs to have one of its virtual page into physical memory, but the physical memory is a no room for other pages be brought.

What will happen in this case?

Well, the BONE will be called to handle this situation by allowing this page to be in physical memory. But to do this, a page already resident in physical memory must be discarded. Now, if the page is deleted is from an image data file or executable and the page has not been written, then it can easily be discarded as whenever necessary, the same page can easily be reduced in physical the same executable image memory or file of data. But lets assume the page who will throw the operating system is one that has been written for, so this kind of pages is known as an incorrect page. An incorrect page must be preserved in order to be used at a later stage. When the incorrect pages are removed from physical memory while they are stored in a special file called exchanging files. This is known as the permutation.

Swap cache:

As already said above, only the incorrect pages are reversed because we keep the pages that have been changed. Additionally, assume that if a page has been changed and was exchanged, now if the same page has been reduced in physical memory and it is now necessary to Exchange again but the page has not changed any yet so it is unnecessary to discuss this page. Dispose of just as this version of the page is already there in the swap file. This allows to save a good amount of time that otherwise would have been lost.

Reference: Linux memory & #8211 management; Permutation, Caches and shared VM

Tags: VMware

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