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<H1>[MUD-Dev] resource management (was: Missing the point)</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] resource management (was: Missing the point)</LI>
<LI><em>From</em>: "Felix A. Croes" <<A HREF="mailto:felix#dworkin,nl">felix#dworkin,nl</A>></LI>
<LI><em>Date</em>: Wed, 28 Oct 1998 16:38:47 +0100 (CET)</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
"Bruce Mitchener, Jr." <bruce#puremagic,com> wrote:
> On Tuesday, October 27, 1998, Chris Gray wrote:
> >[Bruce Mitchener, Jr.:]
> >
> > >for x in [1 .. 100000000000000] {
> > > /* don't run out of ticks */
> > > refresh();
> > > y += "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
> > >}
>[...]
> The problem isn't execution time. The problem is that 'y' will soon be very
> large and handling out-of-memory situations is difficult. Right now, if
> Genesis runs out of memory, it shuts down. This is obviously non-optimal.
> This isn't an issue of imposing a maximum size on a data stored by a
> variable, since someone could just create lots of variables. That continues
> on up to task-groups. I'm trying to find a nice way to handle
> resource-accounting where as little of it is in the driver as possible, but
> is still extensible by the DB code. Even with this, there are problems. If
> quota-tracking (how many bytes of objects a user may have), then one could
> bloat up some objects and bring them into memory to trigger an out-of-memory
> condition.
>
> This greatly affects the security of a system that allows for free-user
> programming. As far as I know, MOO has this problem as well. I don't know
> about Muq, DGD, or MudOS.
It is worse for DGD, because DGD has shared arrays. During execution
of an LPC thread, they may even be shared between objects -- only if
no LPC code is currently executing does the server know which object
data belongs to. Maintaining a notion of ownership during execution
is possible (counting datastructures shared by two objects as
belonging to both) but would involve considerable overhead.
I could just replace shared arrays by unique ones a la MOO, but I
like shared arrays. They are useful for self-referential
datastructures, among other things. Also, I suspect that in
moderately-complex mudlibs, some form of shared data would creep
back in on a higher abstraction level, one way or another.
> Am I just missing something obvious?
I think the problem is actually hard to solve properly. I have
not even attempted to deal with it, yet. I did work on managing
other resources, see
<A HREF="http://www.kanga.nu/~petidomo/lists/mud-dev/1997Q3/msg01200.html">http://www.kanga.nu/~petidomo/lists/mud-dev/1997Q3/msg01200.html</A>
Felix Croes
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: DevMUD: Inheritable modules</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<LI><strong><A NAME="00615" HREF="msg00615.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Thandor <a href="mailto:thandor#donut,dhis.org">thandor#donut,dhis.org</a>, Sat 31 Oct 1998, 04:29 GMT
<UL>
<LI><strong><A NAME="00637" HREF="msg00637.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
The Arrow <a href="mailto:arrow#trelleborg,mail.telia.com">arrow#trelleborg,mail.telia.com</a>, Sat 31 Oct 1998, 21:07 GMT
<UL>
<LI><strong><A NAME="00654" HREF="msg00654.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Thandor <a href="mailto:thandor#donut,dhis.org">thandor#donut,dhis.org</a>, Sun 01 Nov 1998, 02:53 GMT
<UL>
<LI><strong><A NAME="00666" HREF="msg00666.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 01 Nov 1998, 08:34 GMT
</LI>
</UL>
</LI>
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<LI><strong><A NAME="00568" HREF="msg00568.html">[MUD-Dev] resource management (was: Missing the point)</A></strong>,
Felix A. Croes <a href="mailto:felix#dworkin,nl">felix#dworkin,nl</a>, Wed 28 Oct 1998, 16:17 GMT
<LI><strong><A NAME="00566" HREF="msg00566.html">[MUD-Dev] Gamora: Lessons learned? (fwd)</A></strong>,
Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Wed 28 Oct 1998, 14:05 GMT
<UL>
<li><Possible follow-up(s)><br>
<LI><strong><A NAME="00567" HREF="msg00567.html">[MUD-Dev] Gamora: Lessons learned? (fwd)</A></strong>,
Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Wed 28 Oct 1998, 14:06 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00544" HREF="msg00544.html">[MUD-Dev] Re: Why did it take years?</A></strong>,
Cynbe ru Taren <a href="mailto:cynbe#muq,org">cynbe#muq,org</a>, Tue 27 Oct 1998, 07:01 GMT
<UL>
<LI><strong><A NAME="00550" HREF="msg00550.html">[MUD-Dev] Re: Why did it take years?</A></strong>,
Adam Wiggins <a href="mailto:adam#angel,com">adam#angel,com</a>, Tue 27 Oct 1998, 19:37 GMT
</LI>
</UL>
</LI>
</UL></BLOCKQUOTE>
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