When benchmarking a function, what is measured?

Questions / Help
1

If calling different modules and methods inside benchmarking functions also measures their execution also? if sending a message to a process for processing other things , does it include that processing of that process.

scenario = %{
“any” => fn _x → “I mean here” end)
}

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2

No, it only measures the time required to execute the function. If the function is not awaiting on the processing of another process, then neither will your benchmark.

3

waiting includes , driver function waiting for a message from another process through receive?

4

Yes. Think of it this way:

The benchmark is just doing (basically):

start_time = System.now()
function()
end_time = System.now()

end_time - start_time

So if something delays the return of function() then it will delay end_time. If it does not delay the return of function() then it does not.

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5

Waiting for message from another elixir process will also increase the benchmark time?
Thanks

6

Yes. receive do blocks until it receives a message, which means it’ll block the return of the function, which means it’ll take more time in the benchmark.

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7

From documentation Processes - The Elixir programming language :

A timeout can also be specified:

iex> receive do
...>   {:hello, msg}  -> msg
...> after
...>   1_000 -> "nothing after 1s"
...> end
"nothing after 1s"

A timeout of 0 can be given when you already expect the message to be in the mailbox.

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