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Looking Glass

Looking Glass is a tracer and profiler for Erlang/OTP.


Looking Glass is the next generation profiling tool. It is implemented as an erl_tracer NIF and thus requires Erlang/OTP 22.0 or above.

Looking Glass aims to provide a very efficient tool usable both in development and production settings, and capable of running for a long amount of time even on busy systems.

Online documentation

Offline documentation

  • While still online, run make docs

  • User guide available in doc/ in PDF and HTML formats

  • Function reference man pages available in doc/man3/ and doc/man7/

  • Run make install-docs to install man pages on your system

  • Full documentation in Asciidoc available in doc/src/

  • Examples available in examples/

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