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ThreadScope Tour

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A guided tour of ThreadScope

ThreadScope-ch8.png

In this tutorial, we'll be working through concrete examples on using ThreadScope to debug the performance of parallel programs.

We aim to keep each module in the tutorial self-contained, so you can either follow the progression suggested or jump to just the sections we need.

Note that you will need:

  • ThreadScope 0.2.1 or higher
  • GHC 7.4 or higher. You could try earlier versions, but more advanced features such as spark events will not available

This tutorial was initially written by Well-Typed in the context of the Parallel GHC Project. Feedback would be most appreciated!

1 Getting Started

  1. Installation: install ThreadScope and run a sample trace
  2. Hello world: run ThreadScope on a small test program

2 Basic skills

  1. Initial statistics: collect some simple statistics
  2. Profile: examine the profile for a real program
  3. Profile 2: examine the profile for an improved program
  4. Zoom: zooming and bookmarking

3 Digging into a program with spark events

  1. Spark overview
  2. Spark rates: study spark creation/conversion
  3. Spark rates 2: spark debugging continued

4 Reference

5 Planned

  1. Trace: custom events
  2. Consolidate: tease out the sequential parts of code