So its safe to only have a 128mb swapfile when i have 256mb of ram?
Mu
>
> On Tue, 13 Feb 2001, Reynald I. Ngo wrote:
> ..
> > Some says that for a typical server... you need to double your
> > physical memory for swap. If your linux box will be a database server...
> > you need to triple your physical memory for swap. I dunno... just an
> > advice of my former boss. {=)
> ..
>
> in this day and age, that info is wrong.
>
> first, the 2x physical memory or 3x physical memory is good advice for
> BSD-derived boxen, or solaris2. this is because these OS'es store the
> decoded executsble images in swap for fast reloading (e.g. after loading
> the ELF or A.OUT executable, after exiting, the in-core image is saved to
> swap so that next time, it doesn't have to be decoded).
>
> since linux doesn't do that, linux has much smaller swap usage than these
> others.
>
> second, have you actually had a database server that was heavily
> swapping? i cringe to think of the performance loss. oracle's docs plainly
> state that your your SGA should be at most 1/3rd of physical memory to
> avoid swapping, because swapping will kill your performance. so, even
> though lots of swap may seem prudent, in reality you dont ever want to
> touch that swap..
>
>
> --
>
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