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O =?*{0/Heterogeneous Clustered VLIW Microarchitectures 0 ? Alex Alet, Josep M. Codina, Antonio Gonzlez and David Kaeli R(>2 2 @ Clustered Microarchitectures  Challenges in processor design Wire delays Power consumption Clustering: divide the system into semi-independent units Each unit Cluster Fast interconnects intra-cluster Slow interconnects inter-clusters Common trend in commercial VLIW processors DSP/embedded domain:C+ .  C+    Clustered VLIW Architecture  & Motivation  ;Not all instructions have the same impact on execution time < R Motivation  V Motivation   Talk Outline  eHeterogeneous Clustered Architecture Proposed Compiler Techniques Experimental Evaluation Conclusions f 0Heterogeneous Architecture  ?Configured similar to a multiple clock domain design Domain boundaries: Each cluster Inter-connection Network Memory hierarchy Each domain can use a different voltage / frequency Performance oriented: higher voltage/frequency Power oriented: lower voltage/frequency Communication between domains: synchronization queuesv574W6574  W  6   @  Heterogeneous Architecture  Distributed Control Path  XFetch and decode units distributed among clusters Instruction lay-out Grouped by cluster:22 Y X Talk Outline  eHeterogeneous Clustered Architecture Proposed Compiler Techniques Experimental Evaluation Conclusions*f%$ f Statically Scheduled Processors  Performance relies on the compiler Instruction scheduling Register allocation Clustered microarchitectures Cluster assignment Communications Multimedia and numeric code Majority of the execution in loop bodies Modulo schedulingv#H";#H"  ;  Modulo Scheduling  WEffective technique for scheduling loops Overlaps loop iterations Increases parallelism*)d/d)/ X *MS for Heterogeneous   \Proposed Technique   d^Select Voltages and Frequencies  For each domain At program level Consider different delays between fast and slow domains Estimate execution time Estimate energy consumption Select minimum ED2<YGYE  .Estimate Execution Time  Use profiling Texec= niters (II + SC - 1) Tcycle Estimated IT Enough to accommodate All instructions All recurrences Value lifetimes of the profiled homogeneous Communications required by the profiled homogeneous ' !`}   !  `     E            6 NEstimate Energy Consumption  ZSame microarchitecture, different voltages Relative dynamic power Relative static power&+0+0 [ 6 MS Algorithm   J MS Algorithm   ,MS for Heterogeneous  Multilevel graph partitioning algorithm Coarsening Place critical recurrences in fast clusters Refinement Estimate execution time and energy consumption Optimize for ED2 Scheduling Instructions delayed due to synchronization hazards( , @ 4( , >      4  >Recurrence Constrained Loops  VLarge benefits expected A small number of instructions are critical for execution time&?? W Z Talk Outline  eHeterogeneous Clustered Architecture Proposed Compiler Techniques Experimental Evaluation Conclusions*fB  f DExperimental Environment  AMicroarchitecture Clusters 4 clusters 1 FP-unit, 1 INT-unit, 1 memory port, 16 registers per cluster Inter-connection Network 1-cycle latency broadcast buses Heterogeneity Clusters: 1 performance oriented / 3 power oriented Benchmarks: SpecFP2k Fortran programs Loops obtained with ORC Baseline: homogeneous architecture K 4 2# K   4 2# B HResults  BHigh ILP Programs  All instructions have a similar impact on execution time No benefit using different frequencies Higher IPC Dynamic energy accounts for a majority of the total energy consumption Use lower Vdd and lower frequencies Memory hierarchy and inter-connection network can use different voltagesf92kI92RI&  ` _ Talk Outline  eHeterogeneous Clustered Architecture Proposed Compiler Techniques Experimental Evaluation ConclusionsfZ  f ? Conclusions  |Heterogeneous clustered architectures Clusters run at different voltages / frequencies Instructions that impact execution time scheduled in fast clusters Remaining instructions in power-oriented clusters Proposed compiler techniques Algorithm to select the voltages / frequencies MS for heterogeneous configurations ED2 : 15% improvement on average Up to 35% for selected programs&1uS! &1u  S    } /Heterogeneous Clustered VLIW Microarchitectures 0 ? Alex Alet, Josep M. Codina, Antonio Gonzlez and David Kaeli R(>2 2 @ xMotivating Example  Heterogeneous Architecture  Signals  Branch Instructions  Branches decoupled in several instructions (Unbundled Branch Architecture) Branch target computation Independent in each cluster Branch condition evaluation Computed in one cluster Broadcasted to the rest Control transfer Different in each cluster K0K0        ;Results  ]Recurrence Constrained Loops  Largest benefits obtained A small number of instructions are critical for execution time Improvement: 30% - 35% for 189.lucas and 200.sixtrack&uu  Smallest Benefits  ~Around 5% 168.wupwise Loops have different characteristics 173.applu Low number of iterations Schedule length has a big impactb % : % :    /Zbo#'+-/17<@ACEIKOSWY[^`: 0` ̙33` 3` 3333f` 999MMM` f` f3` 3>?" dd@ ?qdx@umKP 5xd@ " `-d3 n?" dd@   @@``PZn   @ ` ` p>>   >6 (  :  Tgֳgֳ ?`  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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