30 lines
770 B
Erlang
30 lines
770 B
Erlang
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-module(processes).
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-export([max/1]).
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%% max(N)
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%%
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%% Create N processes then destroy them
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%% See how much time this takes
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max(N) ->
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Max = erlang:system_info(process_limit),
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RealN = if N > Max -> Max; true -> N end,
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io:format("Max allowed processes: ~p~n", [Max]),
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statistics(runtime),
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statistics(wall_clock),
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L = for(1, RealN, fun() -> spawn(fun() -> wait() end) end),
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{_, Time1} = statistics(runtime),
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{_, Time2} = statistics(wall_clock),
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lists:foreach(fun(Pid) -> Pid ! die end, L),
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U1 = Time1 * 1000 / RealN,
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U2 = Time2 * 1000 / RealN,
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io:format("Process spawn time=~p (~p) microseconds~n", [U1, U2]).
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wait() ->
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receive
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die->
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void
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end.
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for(N, N, F) -> [F()];
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for(I, N, F) -> [F()|for(I+1, N, F)].
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