[MUD-Dev] Re: TECH: Distributed Muds

Derek Snider derek at idirect.com
Tue May 1 11:59:16 New Zealand Standard Time 2001


>From Matthew D. Fuller, April 29, 2001 11:35 PM
> On Fri, Apr 27, 2001 at 12:49:35PM -0400 I heard the voice of
> Derek Snider, and lo! it spake thus:
 
>> Depends on the Unix system.  BSD requires double the VM as RAM.
>> That is a terrible waste of disk space.  With Linux you can get away
>> with using little or no VM.
 
> BSD requires no such thing.  Most BSD manuals will tell you to
> configure at least double the swap as you have physical RAM, because
> for a very very long time, that was conventional wisdom for a
> starting figure, and it's still (IMO) a reasonable beginning
> approximation.  Of course, it requires tuning based on your given
> workload.  You also want one swap partition bigger than your
> physical RAM if you want to be able to take system crashdumps.  And
> finally, at least in the case of FreeBSD, the VM system is more
> agressive than the norm at paging out unused pages and maintaining a
> larger in-core free memory pool.

When we used to use BSDI, we _had to_ give it double the VM as RAM,
otherwise it wouldn't use all the RAM... it would only use as much RAM
as was half the VM.  I don't know if there was some "tweak" or setting
to turn this off (this was BSDI 2.0)
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