Part 7

Performance

Making programs fast on the machines that exist, based on measurement rather than folklore.

• 7.1

  What the compiler does for you

  The optimizations you can rely on, seen in the generated assembly.

  11 min
• 7.2

  Measuring, not guessing

  Benchmarks that tell the truth.

  9 min
• 7.3

  Cache and data layout

  Why the same algorithm can be ten times faster with different data layout.

  8 min
• 7.4

  Zero-cost abstraction, examined

  Which abstractions really are free, and which are not.

  9 min
• 7.5

  Copies, moves, and elision

  Where copies actually happen, and how to stop paying for them.

  8 min
• 7.6

  Inlining, linking, and layout

  How the build shapes the final program's speed.

  10 min