[Semibug] FreeBSD swap - High water mark?

Mike Wayne semibug15 at post.wayne47.com
Tue Mar 24 09:49:53 EDT 2020

On Mon, Mar 23, 2020 at 04:30:01PM -0400, James E Keenan wrote:
> On 3/23/20 4:28 PM, Mike Wayne wrote:
> > Is there a way to determine the high water mark for swap on
> > a FreeBSD system? pstat does not appear to support one and
> > sysctl does not seem to have one either.
> > 
> Can you clarify what you mean by "high water mark" in this context?

The most swap ever used (since boot).

Using X to ignore units in this example:
   Assume 100 X swap. If the high water mark is 15 X, that's plenty.
   If it's 85 X, it's probably too small, even if we are only using 5
   X now.

   Trying to catch usage spikes.

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