Created
June 15, 2018 12:56
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Erlang のメッセージパッシングのコストに関する雑なベンチマーク
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-module(fun_call_vs_msg_passing_heavy). | |
-export([fun_call/1, msg_passing/1]). | |
fib(0) -> 0; | |
fib(1) -> 1; | |
fib(N) -> fib(N - 1) + fib(N - 2). | |
%% fib(20) (そこそこ重い処理のつもり) を N 回呼び出す | |
fun_call(N) -> | |
timer:tc(fun () -> lists:foreach(fun (_) -> fib(20) end, lists:seq(0, N)) end). | |
%% fib(20) の処理を別プロセスやってもらい, 結果を返してもらう. というのを N 回行う. | |
msg_passing(N) -> | |
Worker = spawn_link(fun Loop() -> receive {_, Sender} -> Sender ! fib(20) end, Loop() end), | |
Self = self(), | |
timer:tc(fun () -> lists:foreach(fun (X) -> Worker ! {X, Self}, receive Y -> Y end end, lists:seq(0, N)) end). |
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-module(fun_call_vs_msg_passing_light). | |
-export([fun_call/1, msg_passing/1]). | |
id(X) -> X. | |
%% id 関数を N 回呼び出す | |
fun_call(N) -> | |
timer:tc(fun () -> lists:foreach(fun (X) -> id(X) end, lists:seq(0, N)) end). | |
%% id 関数の呼び出しを別プロセスにやってもらい, 結果を返してもらう. というのを N 回行う. | |
msg_passing(N) -> | |
Worker = spawn_link(fun Loop() -> receive {X, Sender} -> Sender ! id(X) end, Loop() end), | |
Self = self(), | |
timer:tc(fun () -> lists:foreach(fun (X) -> Worker ! {X, Self}, receive Y -> Y end end, lists:seq(0, N)) end). |
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1> c(fun_call_vs_msg_passing_light). | |
{ok,fun_call_vs_msg_passing_light} | |
2> fun_call_vs_msg_passing_light:fun_call(1000000). | |
{44185,ok} | |
3> fun_call_vs_msg_passing_light:msg_passing(1000000). | |
{1301580,ok} <--- 軽い処理を別プロセスにメッセージパッシングでやらせると30倍くらいのコスト | |
1> c(fun_call_vs_msg_passing_heavy). | |
{ok,fun_call_vs_msg_passing_heavy} | |
2> fun_call_vs_msg_passing_heavy:fun_call(100000). | |
{37862940,ok} | |
3> fun_call_vs_msg_passing_heavy:msg_passing(100000). | |
{37378970,ok} <--- 重い処理を別プロセスにメッセージパッシングでやらせても変わらない |
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