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This document (ns Notes and Documentation) provides reference documentation for ns. Although we begin with a simple simulation script, resources like Marc Greis's tutorial web pages (at http://titan.cs.uni-bonn.de/~greis/ns/ ns.html) or the slides from one of the ns tutorials are problably better places to begin for the ns novice.

ly, the remote procedure call problem, which an RPC protocol undertakes to solve, consists of emulating LPC using message passing. LPC has a number of "properties" -- a single procedure invocation results in exactly one execution of the procedure body, the result returned is reliably delivered to the invoker, and exceptions are raised if (and only if) an error occurs. Given a completely reliable communication environment, which never loses, duplicates, or reorders messages, and given client and server processes that never fail, RPC would be trivial to solve. The sender would merely package the invocation into one or more messages, and transmit these to the server. The server would unpack the data into local variables, perform the desired operation, and send back the result (or an indication of any exception that occurred) in a reply message. The challenge, then, is created by failures. Were it not for the possibility of process and machine crashes, an RPC protocol capable of overcomi...

In digital signal processing (DSP) ICs and microprocessors, the datapath is the core where all computations are performed. A datapath compiler is generally used to automatically generate layouts for datapaths by taking advantage of the bit-sliced structure presented in datapaths. Conventional

building block (ABB) library : : : : : : : : : : 26 2.3.2 Execution unit (EXU) model : data-paths and memories 27 2.3.3 Interconnection network : : : : : : : : : : : : : : : : : : 29 2.3.4 Controller model : : : : : : : : : : : : : : : : : : : : : : 29 2.4 Cathedral-2nd low-level mapping script

We present a technique to automatically synthesize a multithreaded in-order pipeline from a high-level unpipelined datapath specification. This work extends the previously proposed transactional specification (T-spec) and synthesis technology (T-piper). The technique not only works with instruction

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ns c ○ is LBNL’s Network Simulator [24]. The simulator is written in C++; it uses OTcl as a command and configuration interface. ns v2 has three substantial changes from ns v1: (1) the more complex objects in ns v1 have been decomposed into simpler components for greater flexibility and composability; (2) the configuration interface is now OTcl, an object oriented version of Tcl; and (3) the interface code to the OTcl interpreter is separate from the main simulator. Ns documentation is available in html, Postscript, and PDF formats. See

We propose a new processing paradigm, called the Expandable Split Window (ESW) paradigm, for exploiting finegrain parallelism. This paradigm considers a window of instructions (possibly having dependencies) as a single unit, and exploits fine-grain parallelism by overlapping the execution of multiple windows. The basic idea is to connect multiple sequential processors, in a decoupled and decentralized manner, to achieve overall multiple issue. This processing paradigm shares a number of properties of the restricted dataflow machines, but was derived from the sequential von Neumann architecture. We also present an implementation of the Expandable Split Window execution model, and preliminary performance results. 1.