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Add back hash performance tests

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Need to consider if magic hash is an issue
This commit is contained in:
Martin Sumner 2017-03-20 20:28:47 +00:00
parent 7154815a2b
commit eec9d509f9
1 changed files with 21 additions and 6 deletions
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27
src/leveled_codec.erl
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@ -581,11 +581,26 @@ corrupted_inker_tag_test() ->
%% Test below proved that the overhead of performing hashes was trivial %% Test below proved that the overhead of performing hashes was trivial
%% Maybe 5 microseconds per hash %% Maybe 5 microseconds per hash
%hashperf_test() -> hashperf_test() ->
% OL = lists:map(fun(_X) -> crypto:rand_bytes(8192) end, lists:seq(1, 10000)), OL = lists:map(fun(_X) -> crypto:rand_bytes(8192) end, lists:seq(1, 1000)),
% SW = os:timestamp(), SW = os:timestamp(),
% _HL = lists:map(fun(Obj) -> erlang:phash2(Obj) end, OL), _HL = lists:map(fun(Obj) -> erlang:phash2(Obj) end, OL),
% io:format(user, "10000 object hashes in ~w microseconds~n", io:format(user, "1000 object hashes in ~w microseconds~n",
% [timer:now_diff(os:timestamp(), SW)]). [timer:now_diff(os:timestamp(), SW)]).
magichashperf_test() ->
KeyFun =
fun(X) ->
K = {o, "Bucket", "Key" ++ integer_to_list(X), null},
{K, X}
end,
KL = lists:map(KeyFun, lists:seq(1, 1000)),
{TimeMH, _HL1} = timer:tc(lists, map, [fun(K) -> magic_hash(K) end, KL]),
io:format(user, "1000 keys magic hashed in ~w microseconds~n", [TimeMH]),
{TimePH, _Hl2} = timer:tc(lists, map, [fun(K) -> erlang:phash2(K) end, KL]),
io:format(user, "1000 keys phash2 hashed in ~w microseconds~n", [TimePH]),
{TimeMH2, _HL1} = timer:tc(lists, map, [fun(K) -> magic_hash(K) end, KL]),
io:format(user, "1000 keys magic hashed in ~w microseconds~n", [TimeMH2]).
-endif. -endif.