Created
April 21, 2010 18:39
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-module(keysearch_microbench). | |
-compile(export_all). | |
test(ListLength, NumberOfReps) -> | |
crypto:start(), | |
Data = make_data(ListLength), | |
% TestId = key(), % worst-case, missing key | |
TestId = element(1,lists:nth(4,Data)), % some key in the list | |
Counter = lists:seq(1,NumberOfReps), | |
T0 = now(), | |
[get_value(TestId, Data) || _I <- Counter], | |
T1 = now(), | |
[proplists:get_value(TestId, Data) || _I <- Counter], | |
T2 = now(), | |
{timer:now_diff(T1, T0), timer:now_diff(T2, T1)}. | |
% proplists:get_value API wrapper around keysearch | |
get_value(Key, List) -> | |
get_value(Key, List, undefined). | |
get_value(Key, List, Default) -> | |
case lists:keysearch(Key, 1, List) of | |
{value, {Key,Value}} -> | |
Value; | |
false -> | |
Default | |
end. | |
make_data(0) -> | |
[]; | |
make_data(N) -> | |
[{key(), random:uniform()}|make_data(N-1)]. | |
key() -> | |
list_to_binary(to_hex(crypto:rand_bytes(16))). | |
to_hex([]) -> | |
[]; | |
to_hex(Bin) when is_binary(Bin) -> | |
to_hex(binary_to_list(Bin)); | |
to_hex([H|T]) -> | |
[to_digit(H div 16), to_digit(H rem 16) | to_hex(T)]. | |
to_digit(N) when N < 10 -> $0 + N; | |
to_digit(N) -> $a + N-10. | |
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Klaus, thanks! I certainly should have added that in the beginning.