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<H1>Re: Just a bit of musing</H1>
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<LI><em>To</em>: &lt;<A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A>&gt;</LI>
<LI><em>Subject</em>: Re: Just a bit of musing</LI>
<LI><em>From</em>: "Jon A. Lambert" &lt;<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>&gt;</LI>
<LI><em>Date</em>: Tue, 11 Mar 1997 14:45:52 -0500</LI>
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<PRE>
&gt; From: coder#ibm,net
&gt;   Every event executes asynchronously in its own thread using a lockless 
&gt;   model.
&gt; 
&gt;   The server core consists of the following base units:
&gt;     -- DB
&gt;     -- Dispatchor
&gt;     -- Executor
&gt;     -- Connection
&lt;snip&gt;
&gt;   
&gt;   User IO arrives thru the Connector.  The connector is essentially a
pool of 
&gt;   threads which asynchronously manage the general pool of outside
connections.  
&gt;   A seperate monitor is responsible for keeping the IO network tree
happy.
&gt; 
&gt;   User commands arrive at the Connector and are immediately sent to the 
&gt;   Dispatchor as Execute-In-Zero-Time (ie no delay) events.  The event
logged 
&gt;   is acutally to parse the command as entered.  The dispatchor then
routes 
&gt;   the event to the Executor, it runs the event and the resultant parse
creates 
&gt;   a new event which is logged with the Dispatchor to actually execute the

&gt;   intended action.  

I am particularly interested in how your pool of threads manages socket
connections.
Are these threads dynamically created to manage connections?  That is, do
you
n+1 threads managing your connections, where n is active connections plus
one
to handle connection requests on the master socket?  Are sockets blocked or
do
you use some other method of activating threads?
  
&lt;snip&gt;
&gt; 
&gt; Well, given an SMP machine, with an OS that will intelligently
distributes
&gt; threads -- that all semi happens for free with me (its not quite so good
&gt; as I try to minimise thread creations, as few to no current OS'es will
&gt; migrate a thread across processors for load sharing).  On the other side,
&gt; a definite design goal of my server is for it so support running in
&gt; clustered enviroments where the entire cluster presents a single
&gt; representation of a game.

It is my understanding that many OSs that implement multi-processing will
allocate one CPU for the OS and the rest of the available units to
application
threads.  NT 3.51 does this as well as many Unixes.  I thought OS2 used
this 
model also.  (please correct me if I'm wrong)
It is also my understanding that NT 4.0 uses a different model and
implements
"load sharing" as you define it above.   I have heard rumors that Digital's
64-bit Unix
uses the "load sharing" model.  Does anyone have any info on this?





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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: Just a bit of musing</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00078" HREF="msg00078.html">Re: Just a bit of musing</A></strong>, 
Adam Wiggins <a href="mailto:nightfall#inficad,com">nightfall#inficad,com</a>, Sat 08 Mar 1997, 19:10 GMT
</LI>
<LI><strong><A NAME="00079" HREF="msg00079.html">Re: Just a bit of musing</A></strong>, 
Adam Wiggins <a href="mailto:nightfall#inficad,com">nightfall#inficad,com</a>, Sat 08 Mar 1997, 19:19 GMT
</LI>
<LI><strong><A NAME="00080" HREF="msg00080.html">Re: Just a bit of musing</A></strong>, 
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 09 Mar 1997, 01:34 GMT
</LI>
<LI><strong><A NAME="00086" HREF="msg00086.html">Re: Just a bit of musing</A></strong>, 
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Tue 11 Mar 1997, 13:45 GMT
</LI>
<LI><strong><A NAME="00088" HREF="msg00088.html">Re: Just a bit of musing</A></strong>, 
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 12 Mar 1997, 03:39 GMT
</LI>
<LI><strong><A NAME="00089" HREF="msg00089.html">Re: Just a bit of musing</A></strong>, 
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 12 Mar 1997, 05:10 GMT
</LI>
<LI><strong><A NAME="00090" HREF="msg00090.html">Re: Just a bit of musing</A></strong>, 
Adam Wiggins <a href="mailto:nightfall#inficad,com">nightfall#inficad,com</a>, Wed 12 Mar 1997, 12:38 GMT
</LI>
<LI><strong><A NAME="00097" HREF="msg00097.html">Re: Just a bit of musing</A></strong>, 
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Thu 13 Mar 1997, 10:11 GMT
</LI>
<LI><strong><A NAME="00099" HREF="msg00099.html">RE: Just a bit of musing</A></strong>, 
Carter T. Shock <a href="mailto:ctso#umiacs,umd.edu">ctso#umiacs,umd.edu</a>, Thu 13 Mar 1997, 10:49 GMT
</LI>
</ul>
</LI>
</UL></BLOCKQUOTE>

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