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<H1>Re: [MUD-Dev] Introduction</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] Introduction</LI>
<LI><em>From</em>: Jeff Kesselman <<A HREF="mailto:jeffk#tenetwork,com">jeffk#tenetwork,com</A>></LI>
<LI><em>Date</em>: Tue, 13 May 1997 21:16:01 -0700</LI>
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<PRE>
At 07:16 PM 5/13/97 PST8PDT, you wrote:
>>(FWIW, someone mentioned that process context switching was
>>expensive. This is true, but your server is going to be switched out
>>anyways, as it's unlikely that nothing else is running on the machine
>>at all.)
As JL poinetd out its EQUALLY unlikely that you have 500 system processes.
But if you spwan a process per user you will get tehre pretty good.
Three snickers bar don't cost me much money... 500...
JK
>
>Context switching is cheap if it does not become a significant part of
>your total process expense (obviously). Run a single process, or even
>just a couple/few processes and is stays cheap. Start running one
>process for every connection or something else equally silly and of a
>sudden context switches start becoming a major fraction of the total
>expense of running your system.
>
>Wanna try something?
>
>Write a little program (shell script will do fine) that does nothing
>but print out numbers and delay a couple seconds every now and then.
>Run a couple copies. They'll run very nicely and very rapidly, The
>price of context switching between the simultaneously executing copies
>is small. Watch your CPU utilisation and it should stay quite low.
>
>Now start up 300 instances of this little trivial program and watch
>your system crawl into the drain. Why? The price of context
>switching between your programs suddenly became a significant
>percentage of the total work your CPU was doing. (Graciously ignoring
>swap, RAM etc aspects that also chime in here).
>
>--
>J C Lawrence Internet: claw#null,net
>(Contractor) Internet: coder#ibm,net
>---------------(*) Internet: clawrenc#cup,hp.com
>...Honorary Member Clan McFUD -- Teamer's Avenging Monolith...
>
>
>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] Re: Prepositions and parsing</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<LI><strong><A NAME="00638" HREF="msg00638.html">Re: [MUD-Dev] Re: Prepositions and parsing</A></strong>,
clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Wed 21 May 1997, 03:30 GMT
<UL>
<LI><strong><A NAME="00815" HREF="msg00815.html">Re: [MUD-Dev] Re: Prepositions and parsing</A></strong>,
Marian Griffith <a href="mailto:gryphon#iaehv,nl">gryphon#iaehv,nl</a>, Tue 27 May 1997, 04:52 GMT
<UL>
<LI><strong><A NAME="00868" HREF="msg00868.html">Re: [MUD-Dev] Re: Prepositions and parsing</A></strong>,
clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Wed 28 May 1997, 06:21 GMT
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<LI><strong><A NAME="00461" HREF="msg00461.html">Re: [MUD-Dev] Disk v. Mem</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Wed 14 May 1997, 21:13 GMT
<LI><strong><A NAME="00455" HREF="msg00455.html">Re: [MUD-Dev] Introduction</A></strong>,
Jeff Kesselman <a href="mailto:jeffk#tenetwork,com">jeffk#tenetwork,com</a>, Wed 14 May 1997, 11:06 GMT
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<li><Possible follow-up(s)><br>
<LI><strong><A NAME="00456" HREF="msg00456.html">Re: [MUD-Dev] Introduction</A></strong>,
Jeff Kesselman <a href="mailto:jeffk#tenetwork,com">jeffk#tenetwork,com</a>, Wed 14 May 1997, 11:16 GMT
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<LI><strong><A NAME="00453" HREF="msg00453.html">Re: [MUD-Dev] RP thesis...</A></strong>,
Jeff Kesselman <a href="mailto:jeffk#tenetwork,com">jeffk#tenetwork,com</a>, Wed 14 May 1997, 10:58 GMT
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<LI><strong><A NAME="00476" HREF="msg00476.html">Re: [MUD-Dev] RP thesis...</A></strong>,
Nathan Yospe <a href="mailto:yospe#hawaii,edu">yospe#hawaii,edu</a>, Thu 15 May 1997, 05:58 GMT
</LI>
<LI><strong><A NAME="00494" HREF="msg00494.html">Re: [MUD-Dev] RP thesis...</A></strong>,
clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Fri 16 May 1997, 08:19 GMT
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