Today I Learned

A Hashrocket project

Timing A Function In Elixir

Erlang provides the :timer module for all things timing. The oddly named function tc will let you know how long a function takes:

{uSecs, :ok} = :timer.tc(IO, :puts, ["Hello World"])

Note that uSecs is microseconds not milliseconds so divide by 1_000_000 to get seconds.

microseconds are helpful though because sometimes functions are just that quick.

:timer.tc(IO, :puts, ["Hello World"])
# {22, :ok}

You can also call :timer.tc with a function and args:

adding = fn (x, y) ->  x + y end

:timer.tc(adding, [1,3])
# {5, 4}

Or just a function:

:timer.tc(fn -> 
    # something really expensive
    :ok
    end)
# {1_302_342, :ok}
Looking for help? Elixir is quickly gaining momentum for web applications that need concurrency, performance, and the ability to connect to many different clients. The developers at Hashrocket are learning along with the rest of the development community that Elixir and Phoenix are viable Rails alternatives for the right application. Check out the source code for Today I Learned, written in Elixir, and contact us if you need help with your Elixir project.