Elixir Client speedup

[predrag-rakic]

@tony612
I tried to reproduce ~10x speed improvement mentioned in darkofabijan/grpc-stress-test#7 (comment) but got only ~10% speedup (single request takes 40ms instead of 44ms):
https://semaphoreci.com/renderedtext/grpc-stress/branches/master/builds/3 vs
https://semaphoreci.com/renderedtext/grpc-stress/branches/pr-cb_speedup/builds/2
(look at the last command output).

PR #5 is how I used https://github.com/tony612/chatterbox/tree/speedup
Is there something I missed?

(I get the same results on my notebook)

[tony612]

I don't know the problem.But there're some differences between yours and mine:

• I print less log by changing priv/client.exs to

{:ok, channel} = GRPC.Stub.connect("localhost:50051")
Enum.each 1..100000, fn(x) ->
  reply = channel |> Helloworld.Greeter.Stub.say_hello(Helloworld.HelloRequest.new(name: Integer.to_string(x)))
  if rem(x, 1000) == 0 do
    IO.puts "#{Time.utc_now} #{x}"
    IO.inspect reply
  end
end

• My Erlang version is OTP 20(?)
• I used Go server
• The test code is different, so they're not comparable. I'm not sure if it's related to Benchee or others.

[predrag-rakic]

I added elixir server to comparison and tried both:

• Elixir 1.4.5 with Erlang 19 build and
• Elixir 1.5.0 with Erlang 20 build

Get the same performance?