Using mdconfig for swap space

Lowell Gilbert freebsd-questions-local at
Wed Sep 9 15:11:44 UTC 2009

Peter Steele <psteele at> writes:

>>Nowadays having swap twice as RAM is not necessary. If your system
>>wasn't swapping much in the past you can safely stay with 4G in my
>>opinion... extending it to 16G would be waste of space :)
> I won't bore you with the details but in fact our application *does*
> require this much swap space, but not for the typical reasons. It's a
> side effect of how our application works and we thought we could make
> use of an image file for the extra swap rather than repartitioning,
> but I've read too many warnings against going this route so I've
> decided to stick with increasing the size of the swap partition.

It's easy to *try* the swap files.  Then measure the performance.  
If the behaviour is really as specific to your custom application 
as you indicate, then general advice may not apply either.

Lowell Gilbert, embedded/networking software engineer, Boston area

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