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<H1>[MUD-Dev] Re: atomic functions</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] Re: atomic functions</LI>
<LI><em>From</em>: "Felix A. Croes" <<A HREF="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</A>></LI>
<LI><em>Date</em>: Fri, 8 May 1998 14:48:33 +0200 (MET DST)</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Sender</em>: "Petidomo List Agent -- Kanga.Nu version" <<A HREF="mailto:petidomo#kanga,nu">petidomo#kanga,nu</A>></LI>
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<PRE>
J C Lawrence <claw#under,engr.sgi.com> wrote:
>[...]
> In the C&C model, the only time an event fails C&C and has to
> reschedule is when another event managed to successfully C&C during
> its execution. That's the only way you can get a changed object to
> cause the C&C failure. Or to put it another way, given N executing or
> about to be executing events, at the end of the iteration you are
> guaranteed that at least one of them will successfully C&C.
>
> The only reason to degrade the threading model down towards
> single-tasking is if you have an event which needs to compleat, but is
> failing due to C&C failures caused by other more sprightly events
> "getting in there first". The classic scenario on-list is Bubba
> digging the Panama Canal.
>
> eg If the "dig panama canal" event were coded to do the whole thing in a
> single very long execution, you are it is likely that it would never
> C&C due to other shorter/faster events getting in and touching objects
> before the "big event" compleats.
>
> C&C has guaranteed thru-put, it just doesn't guarantee much more than
> a trickle.
Putting this into perspective: even if each event collides with all
others, the system will be almost as fast on a multi-processor machine
as a single-threaded system would be. On average it will be much
faster. Much can be done to reduce the number of failing events.
You mentioned that C&C is not a godsend. It is to me, as I am not
starting from scratch but already have a full-fledged mud server
which I want to let take advantage of today's fastest hardware. As
it happens, all of the design decisions I had previously made for
other reasons now make adding C&C to my server easier -- for
example, the infrastructure for making a local copy of data when
required is already in place.
I also like C&C for its simple, ruthless elegance, and for allowing
me to avoid the complex semantics of a system that is multi-threaded
on the mud's programming language level.
> Musing: Do you think when 50 years from now someone does a
> restrospective or history of the early years of VR...there'll be an
> entry under "Bubba"?
BUBBA, the first word in the activator phrase of an outlawed memetic
structure which, for obvious reasons, cannot be fully repeated here:
"Bubba D. the P. C." Blamed for motivating the Second Uprising.
Sealed by Imperial Order in 2035.
Felix Croes
--
MUD-Dev: Advancing an unrealised future.
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: atomic functions</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00454" HREF="msg00454.html">[MUD-Dev] Re: atomic functions</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Thu 07 May 1998, 06:03 GMT
</LI>
<LI><strong><A NAME="00455" HREF="msg00455.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Thu 07 May 1998, 12:35 GMT
<UL>
<LI><strong><A NAME="00541" HREF="msg00541.html">[MUD-Dev] Re: atomic functions</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Wed 13 May 1998, 18:09 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00460" HREF="msg00460.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Thu 07 May 1998, 15:23 GMT
</LI>
<LI><strong><A NAME="00470" HREF="msg00470.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Fri 08 May 1998, 12:51 GMT
</LI>
<LI><strong><A NAME="00564" HREF="msg00564.html">[MUD-Dev] Re: atomic functions</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Thu 14 May 1998, 06:05 GMT
</LI>
<LI><strong><A NAME="00566" HREF="msg00566.html">[MUD-Dev] Re: atomic functions</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Thu 14 May 1998, 06:05 GMT
</LI>
</ul>
</LI>
<LI><strong><A NAME="00289" HREF="msg00289.html">[MUD-Dev] META: Filtering suggestions</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Thu 30 Apr 1998, 23:49 GMT
<LI><strong><A NAME="00277" HREF="msg00277.html">[MUD-Dev] RE: DOOM Gets a Storyline?</A></strong>,
Koster, Raph <a href="mailto:rkoster#origin,ea.com">rkoster#origin,ea.com</a>, Thu 30 Apr 1998, 20:03 GMT
</UL></BLOCKQUOTE>
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