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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>: Tue, 5 May 1998 01:52:40 +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>
Jon A. Lambert <jlsysinc#ix,netcom.com> wrote:
>[...]
> Trivia note: My terminology "spin-lock" comes from IBM's MVS/ESA
> architecture. MVS uses spin-locking in its page locking scheme
> to implement shared memory.
One S is thus revealed. What is Swizzle?
> Another possible downside of both C&C and S&S:
>
> A() {
> for each object in(biglistX) {
> objX = biglistX.current();
> objX.prop = expr;
> }
> }
>
> What are the odds of this ever completing? Perhaps slim to none?
>
> My solution:
> A() {
> for each object in(biglistX) {
> objX = biglistX.current();
> event objX.Setprop(expr); // events are issued for each object
> // Event A would only requires readlock on biglistX
> }
> }
This works in C&C as well. An automatic solution would be to execute
each event that has failed a certain number of times single-threadedly.
Slightly different take: re-execute the offending event while postponing
the completion of all other events that are also being executed.
> J.C. Lawrence is pretty steadfast in that C&C will outperform locking
> and I am still skeptical. The only thing I can say with reasonable
> certainty is that event rescheduling will be more frequent in C&C than
> in S&S. And execution wait time will be longer in S&S than in C&C.
> How this falls out in average throughput time, I an less certain.
Hmm... what is immediately obvious is that the worst-case behaviour
of S&S is a total lock-up, while C&C is guaranteed to be always
executing at least one event that will complete (if any events are
being executed at all). This suggests that C&C will perform better
if there are many conflicts. On the other hand, S&S offers the
programmer more ways to handle those conflicts.
I have a hard time fitting atomic sections into S&S, at all. It
seems to be against the spirit of the system to do a rollback on
failure if the programmer can perform explicit checks, thus
avoiding the failure.
Felix Croes
--
MUD-Dev: Advancing an unrealised future.
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<li><strong><A NAME="00388" HREF="msg00388.html">[MUD-Dev] Re: atomic functions</A></strong>
<ul compact><li><em>From:</em> Joel Dillon <emily#cornholio,new.ox.ac.uk></li></ul>
<li><strong><A NAME="00383" HREF="msg00383.html">[MUD-Dev] Re: atomic functions</A></strong>
<ul compact><li><em>From:</em> "Jon A. Lambert" <jlsysinc#ix,netcom.com></li></ul>
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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="00339" HREF="msg00339.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Sun 03 May 1998, 17:45 GMT
<UL>
<LI><strong><A NAME="00345" HREF="msg00345.html">[MUD-Dev] Re: atomic functions</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 03 May 1998, 16:50 GMT
<UL>
<LI><strong><A NAME="00446" HREF="msg00446.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 06 May 1998, 23:03 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00443" HREF="msg00443.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 06 May 1998, 22:26 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00376" HREF="msg00376.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Mon 04 May 1998, 17:25 GMT
<UL>
<LI><strong><A NAME="00383" HREF="msg00383.html">[MUD-Dev] Re: atomic functions</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Mon 04 May 1998, 20:20 GMT
</LI>
<LI><strong><A NAME="00388" HREF="msg00388.html">[MUD-Dev] Re: atomic functions</A></strong>,
Joel Dillon <a href="mailto:emily#cornholio,new.ox.ac.uk">emily#cornholio,new.ox.ac.uk</a>, Tue 05 May 1998, 07:17 GMT
<UL>
<LI><strong><A NAME="00557" HREF="msg00557.html">[MUD-Dev] Re: atomic functions</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 13 May 1998, 21:32 GMT
</LI>
</UL>
</LI>
</UL>
</LI>
<LI><strong><A NAME="00386" HREF="msg00386.html">[MUD-Dev] Re: atomic functions</A></strong>,
Felix A. Croes <a href="mailto:felix#xs1,simplex.nl">felix#xs1,simplex.nl</a>, Tue 05 May 1998, 06:25 GMT
</LI>
</ul>
</LI>
</UL></BLOCKQUOTE>
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