Workload-Driven Evaluation


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Table of Contents

Workload-Driven Evaluation

Workload-Driven Evaluation

Working Set Perspective

Example Application Set

Working Sets (P=16, assoc, 8 byte)

Working Sets Change with P (NPB)

Where the Time Goes: NPB LU-a

False Sharing Misses: Artifactual Comm.

Questions in Scaling

Under What Constraints to Scale?

Problem Constrained Scaling

Time Constrained Scaling

Memory Constrained Scaling

Scaling Summary

Types of Workloads

NOW Ultra 170 vs Enterprise 5000


Coverage: Stressing Features

Coverage: Levels of Optimization


Workload/Benchmark Suites

Evaluating a Fixed-size Machine

Our problem today

Steps in Choosing Problem Sizes

Steps in Choosing Problem Sizes

Choosing Problem Sizes (contd.)

Multiprocessor Simulation

Execution-driven Simulation

Difficulties in Simulation-based Evaluation

Choosing Parameters

Our Cache Sizes (16x1MB, 16x64KB)

Focus on protocol tradeoffs

Bandwidth per transition

Bandwidth Trade-off

Smaller (64KB) Caches

Cache Block Size

Miss Classification

Breakdown of Miss Rates with Block Size

Breakdown (cont)

Breakdown with 64KB Caches


Traffic with 64 KB caches

Traffic SimOS 1 MB

Making Large Blocks More Effective

Update versus Invalidate

Update vs Invalidate: Miss Rates

Upgrade and Update Rates (Traffic)


Author: David E. Culler

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David E. Culler UC Berkeley CS258 Parallel Computer Architecture Lecture 5