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authorSverker Eriksson <[email protected]>2017-12-13 17:09:24 +0100
committerSverker Eriksson <[email protected]>2017-12-20 15:19:32 +0100
commit881240485b96cfa7d4a75587f6f14c4e6c83eeeb (patch)
treea170811fe322626a36a65a2e83a5f6475c55fb3d /lib/stdlib/test/ets_SUITE.erl
parenta7f87e104e769cb7fed65076193ef0bc4c9f08fd (diff)
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stdlib: Make ets_SUITE memory check try again
as memory stats do not guarantee consistency. A typical ETS test case ends by a lot of deallocating that may now trigger homecoming carrier migration, that in turn can cause quite large inconsistencies in memory stats when same carrier is accounted for twice or not at all. And that's my theory why I now sometimes see transient discrepancies between before and after memory stats.
Diffstat (limited to 'lib/stdlib/test/ets_SUITE.erl')
-rw-r--r--lib/stdlib/test/ets_SUITE.erl28
1 files changed, 21 insertions, 7 deletions
diff --git a/lib/stdlib/test/ets_SUITE.erl b/lib/stdlib/test/ets_SUITE.erl
index 00e02a06cc..a58497523a 100644
--- a/lib/stdlib/test/ets_SUITE.erl
+++ b/lib/stdlib/test/ets_SUITE.erl
@@ -5716,25 +5716,39 @@ etsmem() ->
end},
{Mem,AllTabs}.
-verify_etsmem({MemInfo,AllTabs}) ->
+
+verify_etsmem(MI) ->
wait_for_test_procs(),
+ verify_etsmem(MI, 1).
+
+verify_etsmem({MemInfo,AllTabs}, Try) ->
case etsmem() of
{MemInfo,_} ->
io:format("Ets mem info: ~p", [MemInfo]),
- case MemInfo of
- {ErlMem,EtsAlloc} when ErlMem == notsup; EtsAlloc == undefined ->
+ case {MemInfo, Try} of
+ {{ErlMem,EtsAlloc},_} when ErlMem == notsup; EtsAlloc == undefined ->
%% Use 'erl +Mea max' to do more complete memory leak testing.
{comment,"Incomplete or no mem leak testing"};
- _ ->
- ok
+ {_, 1} ->
+ ok;
+ _ ->
+ {comment, "Transient memory discrepancy"}
end;
{MemInfo2, AllTabs2} ->
io:format("Expected: ~p", [MemInfo]),
io:format("Actual: ~p", [MemInfo2]),
io:format("Changed tables before: ~p\n",[AllTabs -- AllTabs2]),
io:format("Changed tables after: ~p\n", [AllTabs2 -- AllTabs]),
- ets_test_spawn_logger ! {failed_memcheck, get('__ETS_TEST_CASE__')},
- {comment, "Failed memory check"}
+ case Try < 2 of
+ true ->
+ io:format("\nThis discrepancy could be caused by an "
+ "inconsistent memory \"snapshot\""
+ "\nTry again...\n", []),
+ verify_etsmem({MemInfo, AllTabs}, Try+1);
+ false ->
+ ets_test_spawn_logger ! {failed_memcheck, get('__ETS_TEST_CASE__')},
+ {comment, "Failed memory check"}
+ end
end.