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<H1>[MUD-Dev] Re: lurker emerges</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: lurker emerges </LI>
<LI><em>From</em>: "James Wilson" <<A HREF="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</A>></LI>
<LI><em>Date</em>: Sun, 9 Aug 1998 19:43:20 -0400</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
-----Original Message-----
From: T. Alexander Popiel <popiel#snugharbor,com>
To: mud-dev#kanga,nu <mud-dev#kanga,nu>
Cc: popiel#snugharbor,com <popiel#snugharbor,com>
Date: Sunday, August 09, 1998 6:32 PM
Subject: [MUD-Dev] Re: lurker emerges
>In message: <<A HREF="msg00593.html">13773.64266.876212.231468#arioch,tky.hut.fi</A>>
> Petri Virkkula <pvirkkul#iki,fi> writes:
>>>>>>> "Chris" == Chris Gray <cg#ami-cg,GraySage.Edmonton.AB.CA> writes:
>>
>>Chris> In general, I think its clear that threading will only actually
>>Chris> increase your speed if your system has multiple CPUs.
>>
>> That's only true if your program is CPU bound. If the program
>> is I/O bound then count of physical disks is more relevaant
>> factor. In a mixed case I would use (this is only a guess)
>> x+2*y as formula for optimal thread count (x is count of CPUs
>> and y is count of physical disks), count of physical disks are
>> multiplied with 2 to keep disks busy all the time.
>
>*blink blink*
>
>You seem to assume that it is impossible for a single thread to keep
>even one I/O device continuously busy. Whatever happened to double-
>buffering and non-blocking I/O? Has that art actually been lost in
>the annals of time?
I for one have only a vague idea of what this technique consists of.
Could you maybe give some details, or a url describing it? Why would
one need non-blocking i/o if select() tells you which sockets are
ready for reads and writes? That is, assuming you bound the size of
your output chunks appropriately, if the socket's ready for i/o shouldn't
blocking be moot?
>>Chris> Threading has overhead over non-threading, and there isn't
>>Chris> anything you can do about that.
>>
>> Don't forget that non-threading has overhead too: if there is
>> multiple file descriptors then select'ing and going through
>> fd_sets can burns CPU time too.
>
>While this is true, this overhead is something that a creative
>programmer can manage and reduce, while the overhead of multiple
>threads is untouchably bound in the OS kernel.
>
>I prefer problems that I have at least some hope of fixing.
I am curious as to how one could speed up this process - can you
avoid doing a search through the set of all active sockets to find
those that are ready for i/o? Could you split up the fd_sets somehow
to bound the number that would have to be checked? It seems like
when one gets to thousands of simultaneous connections this
could become a bottleneck.
>- Alex
>
>--
>MUD-Dev: Advancing an unrealised future.
>
</PRE>
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<li><strong><A NAME="00603" HREF="msg00603.html">[MUD-Dev] Re: lurker emerges</A></strong>
<ul compact><li><em>From:</em> "T. Alexander Popiel" <popiel#snugharbor,com></li></ul>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: lurker emerges</STRONG>, <EM>(continued)</EM>
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<LI><strong><A NAME="00676" HREF="msg00676.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 12 Aug 1998, 04:33 GMT
</LI>
<LI><strong><A NAME="00656" HREF="msg00656.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Petri Virkkula <a href="mailto:pvirkkul#iki,fi">pvirkkul#iki,fi</a>, Tue 11 Aug 1998, 07:53 GMT
</LI>
</ul>
<LI><strong><A NAME="00654" HREF="msg00654.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Tue 11 Aug 1998, 06:48 GMT
</LI>
</ul>
</ul>
</ul>
</ul>
</ul>
<LI><strong><A NAME="00615" HREF="msg00615.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Petri Virkkula <a href="mailto:pvirkkul#iki,fi">pvirkkul#iki,fi</a>, Mon 10 Aug 1998, 05:57 GMT
</LI>
</ul>
</ul>
<LI><strong><A NAME="00600" HREF="msg00600.html">[MUD-Dev] Re: lurker emerges</A></strong>,
James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Sun 09 Aug 1998, 23:54 GMT
<UL>
<LI><strong><A NAME="00603" HREF="msg00603.html">[MUD-Dev] Re: lurker emerges</A></strong>,
T. Alexander Popiel <a href="mailto:popiel#snugharbor,com">popiel#snugharbor,com</a>, Mon 10 Aug 1998, 02:19 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00602" HREF="msg00602.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 10 Aug 1998, 02:18 GMT
</LI>
<LI><strong><A NAME="00612" HREF="msg00612.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 10 Aug 1998, 05:28 GMT
<UL>
<LI><strong><A NAME="00614" HREF="msg00614.html">[MUD-Dev] Re: lurker emerges</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Mon 10 Aug 1998, 05:57 GMT
</LI>
</UL>
</LI>
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