11. Profiling

11 Profiling

11.1 Do Not Guess About Performance - Profile

Even experienced software developers often guess wrong about where the performance bottlenecks are in their programs. Therefore, profile your program to see where the performance bottlenecks are and concentrate on optimizing them.

Erlang/OTP contains several tools to help finding bottlenecks:

• fprof provides the most detailed information about where the program time is spent, but it significantly slows down the program it profiles.

• eprof provides time information of each function used in the program. No call graph is produced, but eprof has considerable less impact on the program it profiles.

  If the program is too large to be profiled by fprof or eprof, the cover and c

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