[ale] Ram, sigstop, swap, pids, etc

[Calvin Harrigan]

On 2/8/2021 15:09, Solomon Peachy via Ale wrote:
> On Mon, Feb 08, 2021 at 02:13:55PM -0500, Jim Kinney via Ale wrote:
>> Will the kernel move Bob's process from ram to swap and back if it
>> sits in STOP for a while (hours to days)? Unknown how long after Mary
>> starts that it eats all the RAM.
> It won't automatically move Bob's process to swap in one fell swoop;
> instead as Mary's process needs more RAM, Bob's will get incrementally
> paged out as it's not actively being accessed.
>
> And when Mary's is finished, once Bob's is allowed to resume, it will
> get incremetnally paged back in as its components are needed.  (There's
> probably a tunable or other mechanism to "encourage" it to page back in
> more quickly, beyond running swapoff and forcing everything back..)
>
> Performance is going to suffer while the paging is happening.
>
> Perhaps a better option is the explicit checkpoint/restore mechanism using
> the criu tool.
>
>   - Solomon
>
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Not 100% sure if it applies to this situation, but you might want to 
look into the "swappiness" setting.

https://www.howtogeek.com/449691/what-is-swapiness-on-linux-and-how-to-change-it/

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