Hello.
Why in my system Linux never use Swap Partition? My Linux Box is Debian Jessie x64.
I attached a photo that you can see it.

Thank you.

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If you have about 8 GB of RAM, swap is only needed for hibernation. Do you use this feature? I am sure that if you try to use hibernate instead of shutdown your computer for a couple of days you will see something used in swap. Swap partition will be never used if your computer has 8 GB RAM and you shutdown it every day -- no swap is needed and it's normal.

Increase the swappiness parameter if you really want to slowdown your system for no reason at all

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Swap is used in two cases (well, three if you count hibernation):
- Your system runs out of RAM and needs to swap out currently unused parts to make place for currently used parts. If you have enough RAM that your workload fits completely into it this won't happen.
- The system determines that a task is idle for very long times and the memory it uses can better be used for caching. This mostly happens on long running systems which tasks that only run occasionally. An example would be an always running mail-client that checks for mail every few hours, but does nothing in between.

It seems that neither is the case for you, so no need to worry. A problem would be if neither is the case but the system would still be hitting swap.

There used to be a great need for swap.
Over the years the need for it has been reduced in most home users systems only because modern ram is so cheap and fast and amounts are large.

Some programs still might go to swap, but for the most part it will only be there if needed.

The old rule of some multiple is not valid anymore. 2.5 time ram is not a great guess anymore. Swap generally never hurts so you can safely keep it. Making it too large may not hurt anymore too because hard drives are so large relative to past.

You still have choices to make raid swap, change swap settings as in joke about swappines, and can make swap files too.

I am curious as to why one would expect swap to be used when only 25 of RAM is being used? Why is the question being asked?

threadcount++?

Newbie question I assume. ??

Thank you so much.
But Windows OS use Page files every time .

Only on older versions, I think, and it's due to Windows memory management being a little dense.
As mentioned above there may be legitimate reasons to place data into swap, to free up RAM for a disk cache of more often used data for example, but if there is plenty of RAM there is simply no need to use swap. As far as I can tell Windows no longer uses the swap when it is not needed after about Windows 7 -- though I suspect some is sometimes allocated but not actually used.

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