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 performance measurements

Each table row shows performance measurements for this Erlang program with a particular command-line input value N.

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
60,0001.750.9012,808734  51% 75% 38% 36%
600,00012.315.2113,708734  83% 37% 45% 73%
6,000,000120.8749.7114,208734  51% 73% 70% 50%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read chameneos-redux benchmark to see what this program should do.

 notes

Erlang R16B (erts-5.10.1) [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]

 chameneos-redux Erlang program source code

% The Computer Language Benchmarks Game
% http://benchmarksgame.alioth.debian.org/
%%% contributed by Christian von Roques
%%% modified by Jiri Isa

%% Each chameneos is its own process.
%% A chameneos sends {self(), Color} to the broker to request a
%% meeting with another chameneos.
%% The broker replies with {Pid, Color} of the partner met or 'stop'
%% whereupon the chameneos prints the Meetings and Selfmeetings it had
%% and replies with the number of Meetings for the broker to sum.

-module(chameneosredux).
-export([main/1]).

-import(lists, [foreach/2]).

spell(0) -> " zero";
spell(N) -> spell(N, []).

spell(0, L) -> L;
spell(N, L) -> spell(N div 10, [element(N rem 10 + 1, {" zero", " one", " two", " three", " four", " five", " six", " seven", " eight", " nine"}) | L]).


complement(C, C) -> C;
complement(blue, red) -> yellow;
complement(blue, yellow) -> red;
complement(red, blue) -> yellow;
complement(red, yellow) -> blue;
complement(yellow, blue) -> red;
complement(yellow, red) -> blue.


show_complements() ->
    [ io:fwrite("~p + ~p -> ~p~n", [A, B, complement(A, B)]) ||
        A <- [blue, red, yellow],
        B <- [blue, red, yellow]].


print_header(L) ->
    io:fwrite("~n"),
    foreach(fun(C) -> io:fwrite(" ~p", [C]) end, L),
    io:fwrite("~n").


run(L, N) ->
    print_header(L),
    Broker = self(),
    foreach(fun(Color) -> spawn(fun() -> chameneos(Broker, Color, 0, 0) end) end, L),
    broker(N),
    cleanup(length(L), 0).


chameneos(Broker, Color, Meetings, MetSelf) ->
    Broker ! { self(), Color },
    receive
        {OPid, OColor} ->
            chameneos(Broker, complement(Color, OColor), Meetings+1,
                      if OPid == self() -> MetSelf+1; true -> MetSelf end);
        stop ->
            io:fwrite("~w~s\n", [Meetings, spell(MetSelf)]),
            Broker ! Meetings
    end.


broker(0) -> nil;
broker(N) ->
    receive
        C1 = {Pid1, _} -> nil
    end,
    receive
        C2 = {Pid2, _} ->
            Pid1 ! C2,
            Pid2 ! C1,
            broker(N-1)
    end.

cleanup(0, M) -> io:fwrite("~s~n", [spell(M)]);
cleanup(N, M) ->
    receive
        {Pid, _Color} ->
            Pid ! stop,
            cleanup(N, M);
        Meetings ->
            cleanup(N-1, M+Meetings)
    end.


main([Arg]) ->
    N = list_to_integer(Arg),
    show_complements(),
    run([blue, red, yellow], N),
    run([blue, red, yellow, red, yellow, blue, red, yellow, red, blue], N),
    io:fwrite("~n"),
    halt(0).

 make, command-line, and program output logs

Tue, 05 Mar 2013 05:26:13 GMT

MAKE:
mv chameneosredux.erlang chameneosredux.erl
/usr/local/src/otp_src_R16B_nohipe/bin/erlc chameneosredux.erl
rm chameneosredux.erl
0.30s to complete and log all make actions

COMMAND LINE:
/usr/local/src/otp_src_R16B_nohipe/bin/erl  -smp enable -noshell -run  chameneosredux main 6000000

PROGRAM OUTPUT:
blue + blue -> blue
blue + red -> yellow
blue + yellow -> red
red + blue -> yellow
red + red -> red
red + yellow -> blue
yellow + blue -> red
yellow + red -> blue
yellow + yellow -> yellow

 blue red yellow
3995965 zero
3987604 zero
4016431 zero
 one two zero zero zero zero zero zero

 blue red yellow red yellow blue red yellow red blue
1197693 zero
1200867 zero
1200321 zero
1199590 zero
1197265 zero
1200397 zero
1201897 zero
1201132 zero
1200995 zero
1199843 zero
 one two zero zero zero zero zero zero

Revised BSD license

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