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authorSverker Eriksson <[email protected]>2018-09-03 20:05:32 +0200
committerSverker Eriksson <[email protected]>2018-09-03 21:47:30 +0200
commit4253f875c73c577a768847639e9d2411f935d4d2 (patch)
tree527d1a67eb6ad4949ea1f017319fc98a6a6ed6e3 /lib/stdlib
parent5801fcb2b36e04c433dcf0b90a8c47b86e34fc07 (diff)
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erts: Fix ets memstat false leak of FixedDeletion
causing erlang:memory to report too much ets memory.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/test/ets_SUITE.erl45
1 files changed, 43 insertions, 2 deletions
diff --git a/lib/stdlib/test/ets_SUITE.erl b/lib/stdlib/test/ets_SUITE.erl
index 7a48d1d55e..d8912e548c 100644
--- a/lib/stdlib/test/ets_SUITE.erl
+++ b/lib/stdlib/test/ets_SUITE.erl
@@ -66,7 +66,7 @@
meta_lookup_named_read/1, meta_lookup_named_write/1,
meta_newdel_unnamed/1, meta_newdel_named/1]).
-export([smp_insert/1, smp_fixed_delete/1, smp_unfix_fix/1, smp_select_delete/1,
- smp_select_replace/1, otp_8166/1, otp_8732/1]).
+ smp_select_replace/1, otp_8166/1, otp_8732/1, delete_unfix_race/1]).
-export([exit_large_table_owner/1,
exit_many_large_table_owner/1,
exit_many_tables_owner/1,
@@ -142,7 +142,8 @@ all() ->
ets_all,
massive_ets_all,
take,
- whereis_table].
+ whereis_table,
+ delete_unfix_race].
groups() ->
[{new, [],
@@ -5489,6 +5490,46 @@ smp_fixed_delete_do() ->
%%verify_table_load(T),
ets:delete(T).
+%% ERL-720
+%% Provoke race between ets:delete and table unfix (by select_count)
+%% that caused ets_misc memory counter to indicate false leak.
+delete_unfix_race(Config) when is_list(Config) ->
+ EtsMem = etsmem(),
+ Table = ets:new(t,[set,public,{write_concurrency,true}]),
+ InsertOp =
+ fun() ->
+ receive stop ->
+ false
+ after 0 ->
+ ets:insert(Table, {rand:uniform(10)}),
+ true
+ end
+ end,
+ DeleteOp =
+ fun() ->
+ receive stop ->
+ false
+ after 0 ->
+ ets:delete(Table, rand:uniform(10)),
+ true
+ end
+ end,
+ SelectOp =
+ fun() ->
+ ets:select_count(Table, ets:fun2ms(fun(X) -> true end))
+ end,
+ Main = self(),
+ Ins = spawn(fun()-> repeat_while(InsertOp), Main ! self() end),
+ Del = spawn(fun()-> repeat_while(DeleteOp), Main ! self() end),
+ spawn(fun()->
+ repeat(SelectOp, 10000),
+ Del ! stop,
+ Ins ! stop
+ end),
+ [receive Pid -> ok end || Pid <- [Ins,Del]],
+ ets:delete(Table),
+ verify_etsmem(EtsMem).
+
num_of_buckets(T) ->
element(1,ets:info(T,stats)).