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hyperthreading's Introduction

Method

Parallel for loop

Multi-threaded kernel functions

  • Kernels run on any number of threads
  • Each stress the CPU in slightly different ways

Timing code

  • Timing and plotting done with a quick python script.
  • Varies number of threads from 1-8
  • Plot speedup vs number of threads per kernel

Benchmark results

Results

Floating point addition

./figs/add.png

Division bound task

./figs/div.png

Memory bound task

./figs/mem.png

Why add is different

./figs/skylake_scheduler.png

Multiple kernel benchmarks

Division and addition

./figs/div_add.png

Addition and memory

./figs/add_mem.png

Division and memory

./figs/div_mem.png

More complex kernels

N-body forces calculation

./figs/nbody.png

N-body and addition

./figs/nbody_add.png

N-body and memory

./figs/nbody_mem.png

Building and running IACA

Building

  • mkdir build && cd build
  • cmake -DCMAKE_BUILD_TYPE=Release ..
  • make

Running intel architecture code analyser

  • Uncomment IACA_BEGIN and IACA_END from the kernel code
  • cmake –build build
  • iaca/iaca -arch HSW build/libkernels.a

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