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Flexible TicTacTree sizes

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Allow tictac tree sizes to be flexible.

Tested lots of different sizes.  Having both level 1 and level 2 the
same size seemed to be consistently quicker than trying to make either
of the levels relatively wider.

There's an 8% performance improvement if the SegmentCount is reduced by
a quarter.
This commit is contained in:
martinsumner 2017-06-20 10:58:13 +01:00
parent d5b4cb844f
commit 7cfa392b6e
3 changed files with 95 additions and 33 deletions
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7
test/end_to_end/tictac_SUITE.erl
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@ -12,6 +12,8 @@ all() -> [
many_put_compare(_Config) ->
TreeSize = small,
SegmentCount = 256 * 256,
% Test requires multiple different databases, so want to mount them all
% on individual file paths
RootPathA = testutil:reset_filestructure("testA"),
@ -68,6 +70,7 @@ many_put_compare(_Config) ->
TicTacQ = {tictactree_obj,
{o_rkv, "Bucket", null, null, false},
TreeSize,
fun(_B, _K) -> accumulate end},
{async, TreeAFolder} = leveled_bookie:book_returnfolder(Bookie2, TicTacQ),
{async, TreeBFolder} = leveled_bookie:book_returnfolder(Bookie3, TicTacQ),
@ -91,13 +94,13 @@ many_put_compare(_Config) ->
[length(AltList)]),
true = length(SegList0) == 1,
% only the test object should be different
true = length(AltList) > 100000,
true = length(AltList) > 10000,
% check there are a significant number of differences from empty
FoldKeysFun =
fun(SegListToFind) ->
fun(_B, K, Acc) ->
Seg = leveled_tictac:get_segment(K),
Seg = leveled_tictac:get_segment(K, SegmentCount),
case lists:member(Seg, SegListToFind) of
true ->
[K|Acc];