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<H1>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</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>: Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ?? </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, 23 Mar 1998 13:03:06 -0800</LI>
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<PRE>
On Sun, 22 Mar 1998 23:27:30 PST8PDT
Chris Gray<cg#ami-cg,GraySage.Edmonton.AB.CA> wrote:
> - if multiple threads are updating the single image of the DB
> (whether those threads are local or remote), then you need some kind
> of consistency mechanism. If you use locks, then you are vulnerable
> to a client vanishing when it holds locks - you will have to detect
> that and rip the locks away. This also means that your execution
> model has to be very complete with respect to locks, both read locks
> and write locks. With remotely held locks, you can get some *very*
> large latencies.
Look at, umm, COOLMUD's distributed server model for a possible
solution. It does rely on high-bandwidth low-latency connections
between the relevant servers however.
> Alternatively, you might try Chris L's lockless scheme, or
> some variant.
<bow>
> If you use Chris L's lockless scheme, then after the thread
> has run, you need to send full images of changed stuff back to the
> server so that it can be compared and committed. Again, lots of
> traffic and latency. Also, that C & C may take nearly as long as the
> thread execution, so you end up losing out, in terms of the latency
> seen by the user.
This is true. What you really need is something like Arjuna's (or was
that LINCKS -- sorry, its monday) distributed working set concept
(forget what they call it), where objects migrate dynamically among
the servers dependant on need and use characteristics.
> A fully multithreaded server, using Chris L's C&C method, running on
> a large multi-CPU SMP machine is likely the best way to get high
> throughput.
Agreed. You need the high speed interconnect support. SGI machines
with HIPPI crossbars would probably also do in a depending on your
load characteristics.
--
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...
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<LI><STRONG><A NAME="00833" HREF="msg00833.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG>
<UL><LI><EM>From:</EM> cg#ami-cg,GraySage.Edmonton.AB.CA (Chris Gray)</LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<ul compact>
<ul compact>
<LI><strong><A NAME="00899" HREF="msg00899.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Thu 26 Mar 1998, 01:59 GMT
<UL>
<LI><strong><A NAME="00904" HREF="msg00904.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Joel Dillon <a href="mailto:emily#cornholio,new.ox.ac.uk">emily#cornholio,new.ox.ac.uk</a>, Thu 26 Mar 1998, 15:52 GMT
</LI>
</UL>
</LI>
</ul>
</ul>
</ul>
<LI><strong><A NAME="00830" HREF="msg00830.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 22 Mar 1998, 21:10 GMT
</LI>
<LI><strong><A NAME="00833" HREF="msg00833.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 23 Mar 1998, 06:54 GMT
<UL>
<LI><strong><A NAME="00864" HREF="msg00864.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 23 Mar 1998, 21:42 GMT
</LI>
<LI><strong><A NAME="00886" HREF="msg00886.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 25 Mar 1998, 05:28 GMT
<UL>
<LI><strong><A NAME="00902" HREF="msg00902.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Thu 26 Mar 1998, 05:03 GMT
</LI>
</UL>
</LI>
</UL>
</LI>
<LI><strong><A NAME="00836" HREF="msg00836.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 23 Mar 1998, 07:07 GMT
<UL>
<LI><strong><A NAME="00839" HREF="msg00839.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Ross Nicoll <a href="mailto:jrn#st-andrews,ac.uk">jrn#st-andrews,ac.uk</a>, Mon 23 Mar 1998, 08:09 GMT
</LI>
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