design of communication architectures for socs

8/18/2019 Design of Communication Architectures for Socs

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WELCOME


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CONTENTS•

System-Level Analysis for DesigningCommunication Architectures – Techniques categories

– Specify communication architecture

– Performance-analysis methodology

• Design Space Eploration for Customi!ingCommunication Architectures

•

Communication Architecture Templates• Communication Architecture Tuners

• Communication Architectures forEnergy"#attery-E$cient Systems


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INTRODUCTION

• %n-chip communication is increasingly &eing regardedas one of the ma'or hurdles for comple system-on-chip (SoC) designs.

• %n-Chip Communication Architectures

• The *rst &asis for classifying communicationarchitectures is the net+or, topology

• The second &asis for classi*cation is thecommunication protocols employed &y thecommunication architecture


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SYSTEM-LEVEL ANALYSIS FOR

DESIGNING COMMUNICATION

ARCHITECTURES• Estimating the impact of the

communication architecture on overall

system performance and po+erconsumption

• Techniques +hich aim at providingautomatic support to drive the processof communication architectureselection design or optimi!ation


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TECHNIQUES

CATEGORIES

• System simulation-&ased techniques

• Static estimation-&ased techniques

• Trace-&ased techniques


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SYSTEM SIMULATION-BASED TECHNIQUES

• Communication architecture are incorporated &ydeveloping suita&le simulation models of thecommunication architecture topology and protocols .

• Techniques that rely on simulation of the completesystem are typically not feasi&le for eploring largedesign spaces such as those oered &y eisting andemerging communication architectures.

• Simulation speed up is typically achieved &y usinga&stract models of system components and thecommunication architecture.

• /odels typically trade o accuracy for e$ciency.


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STATIC ESTIMATION-

BASED TECHNIQUES

• This class of techniques ma,es use of 0static1 models ofthe communication time &et+een components of system.

• These techniques often assume systems in +hich thecomputations and communications can &e staticallyscheduled.

• 2or many systems using such techniques could result ininaccurate performance and po+er estimates since theyusually ignore or ma,e simplifying assumptions regardingthe occurrence of dynamic eects (e.g. +aiting due to &uscontention).


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TRACE-BASED

TECHNIQUES• 2ast and accurate system performance analysis

technique.

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%ur technique is &ased on a hy&rid trace-&asedperformance analysis methodology +here aninitial cosimulation of the system.

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3nitial cosimulation an a&stract set of traces areetracted containing necessary and su$cientinformation a&out the computations andcommunications of the system components.


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Contd…

• The &asic idea of collecting an eecutiontrace and using it for performanceestimation has &een used in the *eld of

high-performance processor designe.g. for cache simulation


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SPECIFY COMMUNICATION

ARCHITECTURE.

• 4)selecting a topology consisting ofdedicated as +ell as shared communicationchannels interconnected &y &ridges

• 5) mapping the a&stract communicationsto paths in the communication architecture

• 6) customi!ing the protocol used for eachchannel.


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PERFORMANCE-ANALYSIS

METHODOLOGY


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PERFORMANCE-ANALYSIS

METHODOLOGY

• The *rst phase of this methodology constitutes a

preprocessing step in +hich system simulation of the

78"S8components is carried out +ithout

considering the communication architecture

• The second phase consists of three steps9

4) A&stracting information from the simulation trace

and constructing the CA:;

5) Specifying the communication architecture;

6) Analy!ing the system performance under the given

communication architecture


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DESIGN SPACE EXPLORATION FOR CUSTOMIZING

COMMUNICATION ARCHITECTURES

• These include

• (4) selection of an appropriate net+or,

topology• (5) selection of appropriate

communication protocols along +ith

careful con*guration of protocolparameters

• (6) optimi!ation of the mapping of thesystem communications to physical

paths in the topology.

CO C O


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COMMUNICATION

ARCHITECTURE TEMPLATES

•


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COMMUNICATION

ARCHITECTURE TUNERS

• Constitute a layer of circuitry that surrounds acommunication architecture topology

• The CATs monitor the internal state of eachcomponent analy!e the generatedcommunication transactions =0predict1 the

relative importance of communicationtransactions in terms of their impact on system-level performance metrics.

• The results of the prediction are used to con*gure

availa&le communication protocol parameters to&est suit each component>s changingcommunication needs.

• The CATs approach yields improved utili!ation of

the on-chip communication &and+idth andconsequently signi*cant improvements in overall


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COMMUNICATION ARCHITECTURES FOR

ENERGYBATTERY-EFFICIENT SYSTEMS

• reduce the total energy consumption of thesystem

• the manner in +hich energy is dra+n to speci*ccharacteristics of the &attery.

• ?educe the energy consumption of thecommunication architecture itself &y reducingthe po+er consumed &y the +ires constituting thecommunication architecture topology

• The second category consists of techniques thatare concerned +ith the impact of the


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design of communication architectures for socs

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