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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>37.2 Architecture</TITLE><META NAME="description" CONTENT="37.2 Architecture"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node531.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node531.html"><LINK REL="previous" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><LINK REL="up" HREF="node524.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node524.html"><LINK REL="next" HREF="node531.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node531.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html9554" HREF="node531.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node531.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html9548" HREF="node524.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node524.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html9542" HREF="node529.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node529.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html9550" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html9552" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html9555" HREF="node531.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node531.html">37.3 Internals</A><B> Up:</B> <A NAME="tex2html9549" HREF="node524.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node524.html">37. Session-level Packet Distribution</A><B> Previous:</B> <A NAME="tex2html9543" HREF="node529.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node529.html">37.1.2.0.2 Inserting a Loss</A>   <B> <A NAME="tex2html9551" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html9553" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION08120000000000000000"></A><A NAME="sec:session-arch"></A><BR>37.2 Architecture</H1>The purpose of Session-level packet distribution is tospeed up simulations and reduce memory consumption while maintaining reasonable accuracy.The first bottleneck observed is the memory consumption by heavy-weightlinks and nodes. Therefore, in SessionSim (Simulator for Session-levelpacket distribution), we keep only minimal amount of states for links and nodes, and connect the higher level source and receiver applications with appropriate delay and loss modules.A particular source in a group sends its data packetsto a replicator that is responsible for replicating the packetsfor all the receivers.Intermediate loss and delay modules between this replicator and the receiverswill guarantee the appropriate end-to-end characteristics.To put it another way, a session level simulationabstracts out the topology, routing and queueing delays.Packets in SessionSim do not get routed. They only follow the established Session.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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