[MUD-Dev] Re: TECH: Distributed Muds

J C Lawrence claw at 2wire.com
Fri Apr 27 18:09:28 New Zealand Standard Time 2001


On Fri, 27 Apr 2001 12:49:35 -0400 
Derek Snider <derek at idirect.com> wrote:
> From J C Lawrence, April 26, 2001 11:38 PM
>> On Thu, 26 Apr 2001 21:52:23 -0400 Derek Snider
>> <derek at idirect.com> wrote:

>> Most Unix systems get very unhappy when approaching the limits of
>> system/swap space.  Its got nothing to do with malloc()/sbrk()
>> returning NULL, and it has everything with basic assumptions
>> about edge conditions and the kernel coming under stress.  I'd be
>> surprised if you got a clean core dump at the application level.
>> I'd be mildly pleased if you got a clean panic and system dump as
>> versus a spontaneous system reset or lock.

> 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.

Which is not my point.  My point is that Unix systems tend to become
unstable when the system heap is exhausted.  This has nothing to do
with the size of swap and everything to do with system heap
exhaustion.

--
J C Lawrence                                       claw at kanga.nu
---------(*)                          http://www.kanga.nu/~claw/
--=| A man is as sane as he is dangerous to his environment |=--
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