In message <>, David 
Chisnall w
> On 19 Aug 2017, at 17:54, Cy Schubert <> wrote:
> > 
> >> 3. should total swap be 1x 2x or some other multiple of RAM these days?
> > 
> > Depends. If you're running some kind of database server or OLTP 
> > application. Some vendors recommend no swap whatsoever while others 
> > recommend some. What does your application vendor recommend?
> The main advantage of swap these days (on machines with that sort of amount o
> f RAM) is to allow you to keep some file-backed memory objects in memory in p
> reference to leaked (or very cold) heap memory.  

Memory overcommitment and the working set of each address space determines 
how much and what is paged out.

Cy Schubert <>
FreeBSD UNIX:  <>   Web:

        The need of the many outweighs the greed of the few.

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