User's Guide
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Efficiency Guide
User's Guide
Version 5.7.5

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Chapters

- Introduction
  - Top of chapter
  - Purpose
  - Prerequisites
- The Eight Myths of Erlang Performance
  - Top of chapter
  - Myth: Funs are slow
  - Myth: List comprehensions are slow
  - Myth: Tail-recursive functions are MUCH faster than recursive functions
  - Myth: '++' is always bad
  - Myth: Strings are slow
  - Myth: Repairing a Dets file is very slow
  - Myth: BEAM is a stack-based byte-code virtual machine (and therefore slow)
  - Myth: Use '_' to speed up your program when a variable is not used
- Common Caveats
  - Top of chapter
  - The regexp module
  - The timer module
  - list_to_atom/1
  - length/1
  - setelement/3
  - size/1
  - split_binary/2
  - The '--' operator
- Constructing and matching binaries
  - Top of chapter
  - How binaries are implemented
  - Constructing binaries
  - Matching binaries
- List handling
  - Top of chapter
  - Creating a list
  - List comprehensions
  - Deep and flat lists
  - Why you should not worry about recursive lists functions
- Functions
  - Top of chapter
  - Pattern matching
  - Function Calls
  - Memory usage in recursion
- Tables and databases
  - Top of chapter
  - Ets, Dets and Mnesia
  - Ets specific
  - Mnesia specific
- Processes
  - Top of chapter
  - Creation of an Erlang process
  - Process messages
  - The SMP emulator
- Drivers
  - Top of chapter
  - Drivers and concurrency
  - Avoiding copying of binaries when calling a driver
  - Returning small binaries from a driver
  - Returning big binaries without copying from a driver
- Advanced
  - Top of chapter
  - Memory
  - System limits
- Profiling
  - Top of chapter
  - Do not guess about performance - profile
  - Big systems
  - What to look for
  - Tools
  - Benchmarking

# Efficiency Guide User's Guide

#### Version 5.7.5

#### February 22 2010

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