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diff --git a/pipermail/nel/2001-February/000252.html b/pipermail/nel/2001-February/000252.html new file mode 100644 index 00000000..a3922258 --- /dev/null +++ b/pipermail/nel/2001-February/000252.html @@ -0,0 +1,104 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML> + <HEAD> + <TITLE> [Nel] NeL Network Engine</TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:cado%40nevrax.com"> + <LINK REL="Previous" HREF="000249.html"> + <LINK REL="Next" HREF="000253.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[Nel] NeL Network Engine</H1> + <B>Olivier Cado</B> + <A HREF="mailto:cado%40nevrax.com" + TITLE="[Nel] NeL Network Engine">cado@nevrax.com</A><BR> + <I>Thu, 22 Feb 2001 16:41:12 +0100</I> + <P><UL> + <LI> Previous message: <A HREF="000249.html">[Nel] agent service</A></li> + <LI> Next message: <A HREF="000253.html">[Nel] NeL Network Engine</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#252">[ date ]</a> + <a href="thread.html#252">[ thread ]</a> + <a href="subject.html#252">[ subject ]</a> + <a href="author.html#252">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>We are very pleased that you are interested by NeL and our project. +Thanks to free software, we are now working in cooperation with the +community. So let's discuss some network issues. + +Here is the purpose of this message: +- Present the future of the NeL Network Engine +- Ask for your input on a couple of points + +At present, the Nel Network Engine is single-threaded. We plan to +rewrite the engine using multi-threading. The library will be made up of +five layers: +- Layer 0: socket wrapper (roughly, present CBaseSocket + listening +socket functionalities) +- Layer 1: multiple socket multi-threaded I/O mechanism +- Layer 2: adapted to CMemStream (allows serialization) +- Layer 3: adapted to CMessage (contains type information) +- Layer 4: using callbacks (as presently used in the services and +provided by CMsgSocket) + +The main features of Layer 1 are as follows: + +External view: +The user programmer will be able to send data (A), to check if some data +has been received (B), and if so to get a data block from the receive +queue. + +Implementation: +(A) When the user requests to send data, his data block is put into a +send queue. The actual sending is triggered off by a time flush trigger, +a size flush trigger or an explicit flush trigger (at the user's +demand). Let's say the queue control is executed in the main thread, in +an update() method, called evenly. +(B) Each connection is handled by a separate thread that sleeps while +not receiving data so that no CPU time will be used if nothing is +received on a particular socket. When incoming data is actually +received, it is put into a global receive queue (synchronized with a +mutex of course) and popped when the user requests to receive a block. + +This implementation still raises a few questions: +(A) If no buffer space is available within the transport system to hold +the data to be transmitted, the actual sending will block. Has anybody +come across this case ? When does this happen in practice ? +(B) As we are building a *massively* multiplayer game, we expect to have +a great number of connections (even if all clients won't be connected on +the same machine), therefore a great number of threads. Does anybody +know the scale limits on Linux systems (and on Windows BTW), i.e. the +optimum and maximum thread numbers per process and per system ? + +I'm sure a lot of you are great Linux specialists, so you probably have +an idea about this issues. + +Thanks. +Olivier Cado +-- +<A HREF="http://www.nevrax.org">http://www.nevrax.org</A> + +</pre> + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI> Previous message: <A HREF="000249.html">[Nel] agent service</A></li> + <LI> Next message: <A HREF="000253.html">[Nel] NeL Network Engine</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#252">[ date ]</a> + <a href="thread.html#252">[ thread ]</a> + <a href="subject.html#252">[ subject ]</a> + <a href="author.html#252">[ author ]</a> + </LI> + </UL> +</body></html> |