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<H1>Re: [MUD-Dev] Multi-threaded mud server.</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>: Re: [MUD-Dev] Multi-threaded mud server.</LI>
<LI><em>From</em>: "Jon A. Lambert" <<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>></LI>
<LI><em>Date</em>: Mon, 17 May 1999 01:03:47 -5</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Sender</em>: <A HREF="mailto:mud-dev-admin#kanga,nu">mud-dev-admin#kanga,nu</A></LI>
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<PRE>
On 16 May 99,, Caliban Tiresias Darklock wrote:
> On 08:42 PM 5/16/99 +0000, I personally witnessed Ross Nicoll jumping up to
> say:
> >
> >The MUD creates as many threads as processors, and then allocates players
> >and computer characters in such a way that load on each processor should
> >be roughly equal. This should keep context switching to a minimum.
>
> Maybe I don't understand context switching -- my understanding of threads
> is minimal -- but this sounds fallacious. As I understand it, context
> switching is when one thread gives way to another thread, which means its
> state (context) needs to be saved and the other's has to be restored
> (switching).
>
Yes, but I can't for the life of me figure out why it's so damn important
to avoid. ;)
Here's a common example:
There exists a 400 mhz Pentium II single-processor with 64 Mb of memory
running Redhat Linux. Running on the server is ftpd, httpd, telnetd,
smptd, dns, a stock Diku mud server, a DGD LP mud server, and a ColdMUD
server. The server is probably underloaded.
Is there context switching going on here? YES! Loads and loads of the
"expensive" process-level context switching.
<rant>
Now suppose I wish to redesign and multi-thread that Diku mud server.
Why would I WORRY about the overhead of "cheaper" thread-level context
switching?
Why should I CARE at the application-level how many processors are
present on the friggin box!?!@#!??
</rant>
--
--* Jon A. Lambert - TychoMUD Email:jlsysinc#ix,netcom.com *--
--* Mud Server Developer's Page <<A HREF="http://pw1.netcom.com/~jlsysinc">http://pw1.netcom.com/~jlsysinc</A>> *--
--* To fight the empire is to be infected by its derangement. Whosoever *--
--* defeats part of the empire becomes the empire; it proliferates like a *--
--* a virus... thereby it becomes its enemies." -- P.K. Dick *--
_______________________________________________
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<li><strong><A NAME="00337" HREF="msg00337.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>
<ul compact><li><em>From:</em> Ross Nicoll <rnicoll#lostics,demon.co.uk></li></ul>
<li><strong><A NAME="00302" HREF="msg00302.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>
<ul compact><li><em>From:</em> Jo Dillon <emily#thelonious,new.ox.ac.uk></li></ul>
<li><strong><A NAME="00301" HREF="msg00301.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>
<ul compact><li><em>From:</em> Mik Clarke <mikclrk#ibm,net></li></ul>
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<LI><STRONG><A NAME="00273" HREF="msg00273.html">Re: [MUD-Dev] Multi-threaded mud server.</A></STRONG>
<UL><LI><EM>From:</EM> Caliban Tiresias Darklock <caliban#darklock,com></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] Multi-threaded mud server.</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<ul compact>
<ul compact>
<LI><strong><A NAME="00297" HREF="msg00297.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Mark Gritter <a href="mailto:mark#erdos,Stanford.EDU">mark#erdos,Stanford.EDU</a>, Tue 18 May 1999, 06:43 GMT
</LI>
<LI><strong><A NAME="00299" HREF="msg00299.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Ross Nicoll <a href="mailto:rnicoll#lostics,demon.co.uk">rnicoll#lostics,demon.co.uk</a>, Tue 18 May 1999, 06:45 GMT
</LI>
</ul>
<LI><strong><A NAME="00284" HREF="msg00284.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Mon 17 May 1999, 15:46 GMT
<UL>
<LI><strong><A NAME="00294" HREF="msg00294.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Ross Nicoll <a href="mailto:rnicoll#lostics,demon.co.uk">rnicoll#lostics,demon.co.uk</a>, Tue 18 May 1999, 06:42 GMT
</LI>
</UL>
</LI>
</ul>
<LI><strong><A NAME="00283" HREF="msg00283.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Mon 17 May 1999, 15:45 GMT
<UL>
<LI><strong><A NAME="00301" HREF="msg00301.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Mik Clarke <a href="mailto:mikclrk#ibm,net">mikclrk#ibm,net</a>, Tue 18 May 1999, 07:01 GMT
</LI>
<LI><strong><A NAME="00302" HREF="msg00302.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Jo Dillon <a href="mailto:emily#thelonious,new.ox.ac.uk">emily#thelonious,new.ox.ac.uk</a>, Tue 18 May 1999, 07:02 GMT
<UL>
<LI><strong><A NAME="00308" HREF="msg00308.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Travis S. Casey <a href="mailto:efindel#io,com">efindel#io,com</a>, Wed 19 May 1999, 04:47 GMT
</LI>
<LI><strong><A NAME="00315" HREF="msg00315.html">Re: [MUD-Dev] Multi-threaded mud server.</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Thu 20 May 1999, 05:20 GMT
</LI>
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