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Improve from_list speed

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This commit is contained in:
Martin Sumner 2017-01-20 16:35:38 +00:00
parent 220d493b5a
commit 1745ba6863
1 changed files with 10 additions and 10 deletions
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20
src/leveled_tree.erl
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@ -35,7 +35,7 @@
from_orderedlist(OrderedList) ->
L = length(OrderedList),
{tree, L, from_orderedlist(OrderedList, empty_tree(), L)}.
{tree, L, from_orderedlist(OrderedList, [], L)}.
from_orderedset(Table) ->
from_orderedlist(ets:tab2list(Table)).
@ -98,13 +98,13 @@ empty() ->
%%%============================================================================
from_orderedlist([], Tree, _L) ->
Tree;
from_orderedlist(OrdList, Tree, L) ->
from_orderedlist([], TmpList, _L) ->
gb_trees:from_orddict(TmpList);
from_orderedlist(OrdList, TmpList, L) ->
SubLL = min(?SKIP_WIDTH, L),
{Head, Tail} = lists:split(SubLL, OrdList),
{LastK, _LastV} = lists:last(Head),
from_orderedlist(Tail, tree_insert(LastK, Head, Tree), L - SubLL).
from_orderedlist(Tail, TmpList ++ [{LastK, Head}], L - SubLL).
lookup_match(_Key, []) ->
none;
@ -174,9 +174,6 @@ lookup_range_end(EndRange, {NK0, SL0}, Iter0, Output, EndRangeFun) ->
empty_tree() ->
gb_trees:empty().
tree_insert(K, V, T) ->
gb_trees:insert(K, V, T).
tree_to_list(T) ->
gb_trees:to_list(T).
@ -230,6 +227,7 @@ tree_search_test() ->
StartKeyFun = fun(V) -> V end,
SW = os:timestamp(),
?assertMatch([], search_range(0, 1, T, StartKeyFun)),
?assertMatch([], search_range(201, 202, T, StartKeyFun)),
?assertMatch([{4, 2}], search_range(2, 4, T, StartKeyFun)),
@ -239,11 +237,13 @@ tree_search_test() ->
?assertMatch(50, length(search_range(2, 198, T, StartKeyFun))),
?assertMatch(49, length(search_range(2, 197, T, StartKeyFun))),
?assertMatch(49, length(search_range(4, 197, T, StartKeyFun))),
?assertMatch(48, length(search_range(5, 197, T, StartKeyFun))).
?assertMatch(48, length(search_range(5, 197, T, StartKeyFun))),
io:format(user, "10 range tests in ~w microseconds~n",
[timer:now_diff(os:timestamp(), SW)]).
tree_test() ->
N = 4000,
N = 2000,
KL = lists:ukeysort(1, generate_randomkeys(1, N, 1, N div 5)),
OS = ets:new(test, [ordered_set, private]),