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<H1>[MUD-Dev] Re: MUD Development Digest</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: MUD Development Digest</LI>
<LI><em>From</em>: J C Lawrence <<A HREF="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</A>></LI>
<LI><em>Date</em>: Mon, 06 Apr 1998 10:09:44 -0700</LI>
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<PRE>
Date: Sat, 4 Apr 1998 11:45:05 -0600
Message-Id: <199804041745.LAA07123#laurel,actlab.utexas.edu>
From: Cynbe ru Taren <cynbe#muq,org>
Subject: [MUD-Dev] Re: MUD Development Digest
Dr Cat (cat#bga,com):
| I presume the comments about disk-based muds running faster than
| memory-based ones are including the tacit assumption that one is
| talking about muds that don't have the option of running on a machine
| with a large surplus of RAM?
For the most part -- but remember that even if you're not paging
within the disk/ram portion of the memory hierachy, you're probably
still paging between ram/cache2 and cache2/cache1: Better locality
of reference will still improve performance there.
A fundamental win of a disk-based system comes from clustering
data used together in ram, which improves performance at all
levels of a hierarchy.
A viable alternative is to do the same thing entirely in ram -- a
copying garbage collector, for example, can have this effect. Well
done, on ram-poor systems this can result in entire pages full of
unused objects paging out to disk, yielding an effectively disk-based
system without the explicitly coded disk I/O.
| Still, I would think that disk-based servers would be
| faster for some muds, not for all muds.
In practice, I think the difference is likely to be (assuming
well-written servers) that a disk-based mud will run about 5% slower
than a ram-based mud in a ram-rich environment, but may run many times
faster than a ram-based mud in a ram-poor environment (unless the
ram-based mud is effectively disk-based as described above): The
downside is much bigger than the upside, so if running in ram-poor
conditions is a reasonable possibility, a disk-based design may make
sense. If you can definitely count on running in a ram-rich
environment, on the other hand, a disk-based system is probably just
slower and more complex.
| I realize that purchasing a RAID array isn't an option for most hobby
| projects.
Note however that ram is currently running about $1/Meg -- check
<A HREF="http://www.pricewatch.com/">http://www.pricewatch.com/</A> if you haven't been following it. At
this price even hobby projects can run pretty large dbs entirely
out of ram. I've configured a dual-CPU PentiumPro/150MHz box
with 256Meg of ram as a Muq testbed -- I went with the dual-CPU
motherboard partly just because it has 8 rather than 4 SIMM slots,
letting me load up more on el cheapo 32Meg simms. If I were
building it at today's prices, I might configure it with 512Meg
instead. :)
A gigabyte of ram in a hobbyist machine is clearly not far off.
*boggle* -- I wrote my first multi-user online system to run in
48K of ram...
Cynbe
--
J C Lawrence Internet: claw#null,net
(Contractor) Internet: coder#ibm,net
---------(*) Internet: claw#under,engr.sgi.com
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
</PRE>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>META: The web presence and wot it ain't gonna be</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<ul compact>
<ul compact>
<ul compact>
<LI><strong><A NAME="00060" HREF="msg00060.html">META: The web presence and wot it ain't gonna be</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 07 Apr 1998, 22:27 GMT
</LI>
</ul>
</ul>
<LI><strong><A NAME="00057" HREF="msg00057.html">Re: [MUD-Dev] Re: [Fwd: MUD-Dev]</A></strong>,
maddog <a href="mailto:maddog#best,com">maddog#best,com</a>, Tue 07 Apr 1998, 20:50 GMT
<UL>
<LI><strong><A NAME="00059" HREF="msg00059.html">Re: [MUD-Dev] Re: [Fwd: MUD-Dev]</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 07 Apr 1998, 22:24 GMT
</LI>
</UL>
</LI>
</ul>
</ul>
<LI><strong><A NAME="00083" HREF="msg00083.html">Re: [MUD-Dev] [Fwd: MUD-Dev]</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Thu 09 Apr 1998, 02:24 GMT
</LI>
</ul>
</LI>
<LI><strong><A NAME="00040" HREF="msg00040.html">[MUD-Dev] Re: MUD Development Digest</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 06 Apr 1998, 17:09 GMT
<UL>
<li><Possible follow-up(s)><br>
<LI><strong><A NAME="00123" HREF="msg00123.html">Re: [MUD-Dev] Re: MUD Development Digest</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Fri 10 Apr 1998, 18:21 GMT
<UL>
<LI><strong><A NAME="00125" HREF="msg00125.html">Re: [MUD-Dev] Re: MUD Development Digest</A></strong>,
Jon Leonard <a href="mailto:jleonard#divcom,umop-ap.com">jleonard#divcom,umop-ap.com</a>, Fri 10 Apr 1998, 19:33 GMT
</LI>
<LI><strong><A NAME="00337" HREF="msg00337.html">[MUD-Dev] Re: MUD Development Digest</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 22 Apr 1998, 22:24 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00387" HREF="msg00387.html">[MUD-Dev] Re: MUD Development Digest</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Thu 23 Apr 1998, 14:46 GMT
</LI>
</UL>
</LI>
</UL></BLOCKQUOTE>
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