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-rw-r--r--erts/emulator/test/erts_debug_SUITE.erl24
1 files changed, 18 insertions, 6 deletions
diff --git a/erts/emulator/test/erts_debug_SUITE.erl b/erts/emulator/test/erts_debug_SUITE.erl
index e5c904cfb9..bc5928436f 100644
--- a/erts/emulator/test/erts_debug_SUITE.erl
+++ b/erts/emulator/test/erts_debug_SUITE.erl
@@ -71,6 +71,11 @@ test_size(Config) when is_list(Config) ->
4 = do_test_size(#{}),
32 = do_test_size(#{b => 2,c => 3,txt => "hello world"}),
+ true = do_test_size(maps:from_list([{I,I}||I<-lists:seq(1,256)])) >= map_size_lower_bound(256),
+ true = do_test_size(maps:from_list([{I,I}||I<-lists:seq(1,4096)])) >= map_size_lower_bound(4096),
+ true = do_test_size(maps:from_list([{I,I}||I<-lists:seq(1,254)])) >= map_size_lower_bound(254),
+ true = do_test_size(maps:from_list([{I,I}||I<-lists:seq(1,239)])) >= map_size_lower_bound(239),
+
%% Test internal consistency of sizes, but without testing
%% exact sizes.
Const = id(42),
@@ -92,14 +97,14 @@ test_size(Config) when is_list(Config) ->
%% Test shared data structures.
do_test_size([ConsCell1|ConsCell1],
- 3*ConsCellSz,
- 2*ConsCellSz),
+ 3*ConsCellSz,
+ 2*ConsCellSz),
do_test_size(fun() -> {ConsCell1,ConsCell2} end,
- FunSz2 + 2*ConsCellSz,
- FunSz2 + ConsCellSz),
+ FunSz2 + 2*ConsCellSz,
+ FunSz2 + ConsCellSz),
do_test_size({SimplestFun,SimplestFun},
- 2*FunSz0+do_test_size({a,b}),
- FunSz0+do_test_size({a,b})),
+ 2*FunSz0+do_test_size({a,b}),
+ FunSz0+do_test_size({a,b})),
M = id(#{ "atom" => first, i => 0}),
do_test_size([M,M#{ "atom" := other },M#{i := 42}],54,32),
@@ -113,6 +118,13 @@ do_test_size(Term, FlatSz, Sz) ->
FlatSz = erts_debug:flat_size(Term),
Sz = erts_debug:size(Term).
+map_size_lower_bound(N) ->
+ %% this est. is a bit lower that actual lower bound
+ %% number of internal nodes
+ T = (N - 1) div 15,
+ %% total words
+ 2 + 17 * T + 2 * N.
+
flat_size_big(Config) when is_list(Config) ->
%% Build a term whose external size only fits in a big num (on 32-bit CPU).
flat_size_big_1(16#11111111111111117777777777777777888889999, 0, 16#FFFFFFF).