-module(call_bm).
-export([benchmarks/0]).
-export([local_call/1,external_call/1,fun_call/1,apply_fun/1,apply_mfa/1]).
-export([foo/0]).

benchmarks() ->
    {400000,[local_call,external_call,fun_call,apply_fun,apply_mfa]}.

-define(rep5(X), X, X, X, X, X).
-define(rep10(X), ?rep5(X), ?rep5(X)).
-define(rep20(X), ?rep10(X), ?rep10(X)).

local_call(0) ->
    ok;
local_call(Iter) ->
    ?rep20(foo()),
    local_call(Iter-1).

external_call(0) ->
    ok;
external_call(Iter) ->
    ?rep20(?MODULE:foo()),
    external_call(Iter-1).

fun_call(Iter) ->
    fun_call(Iter, fun() -> ok end).
fun_call(0, Fun) ->
    ok;
fun_call(Iter, Fun) ->
    ?rep20(Fun()),
    fun_call(Iter-1, Fun).

apply_fun(Iter) ->
    apply_fun(Iter, fun() -> ok end).
apply_fun(0, Fun) ->
    ok;
apply_fun(Iter, Fun) ->
    ?rep20(apply(Fun, [])),
    apply_fun(Iter-1, Fun).

apply_mfa(0) ->
    ok;
apply_mfa(Iter) ->
    ?rep20(apply(?MODULE, foo, [])),
    apply_mfa(Iter-1).

foo() -> ok.