noahshaw11 commented on code in PR #3985:
URL: https://github.com/apache/couchdb/pull/3985#discussion_r877383137
##########
src/couch/src/couch_debug.erl:
##########
@@ -620,6 +676,90 @@ info_size(InfoKV) ->
{binary, BinInfos} -> lists:sum([S || {_, S, _} <- BinInfos]);
{_, V} -> V
end.
+resource_hoggers(MemoryInfo, InfoKey) ->
+ KeyFun = fun
+ ({_Pid, _Id, undefined}) -> undefined;
+ ({_Pid, Id, DataMap}) -> {Id, [{InfoKey, maps:get(InfoKey, DataMap)}]}
+ end,
+ resource_hoggers(MemoryInfo, InfoKey, KeyFun).
+
+resource_hoggers(MemoryInfo, InfoKey, KeyFun) ->
+ HoggersData = resource_hoggers_data(MemoryInfo, InfoKey, KeyFun),
+ TableSpec = [
+ {50, centre, id},
+ {20, centre, InfoKey}
+ ],
+ print_table(HoggersData, TableSpec).
+
+resource_hoggers_data(MemoryInfo, InfoKey, KeyFun) when is_atom(InfoKey) ->
+ resource_hoggers_data(MemoryInfo, InfoKey, KeyFun, 20).
+
+resource_hoggers_data(MemoryInfo, InfoKey, KeyFun, N) when is_atom(InfoKey)
and is_integer(N) ->
+ SortedTuples = resource_hoggers_data(MemoryInfo, InfoKey, KeyFun,
undefined),
+ {TopN, _} = lists:split(N, SortedTuples),
+ TopN;
+resource_hoggers_data(MemoryInfo, InfoKey, KeyFun, undefined) when
is_atom(InfoKey) ->
+ Tuples = lists:filtermap(
+ fun(Tuple) ->
+ case KeyFun(Tuple) of
+ undefined ->
+ false;
+ Value ->
+ {true, Value}
+ end
+ end,
+ MemoryInfo
+ ),
+ lists:reverse(lists:keysort(2, Tuples)).
+
+resource_hoggers_snapshot({N, MemoryInfo, InfoKeys} = _Snapshot) ->
+ Data = lists:filtermap(
+ fun({Pid, Id, Data}) ->
+ case memory_info(Pid, InfoKeys) of
+ {Pid, undefined, undefined} ->
+ false;
+ {_, _, DataMap} ->
+ {true, {Pid, Id, update_delta(Data, DataMap)}}
+ end
+ end,
+ MemoryInfo
+ ),
+ {N + 1, Data, InfoKeys};
+resource_hoggers_snapshot([]) ->
+ [];
+resource_hoggers_snapshot([{_Pid, _Id, Data} | _] = MemoryInfo) ->
+ resource_hoggers_snapshot({0, MemoryInfo, maps:keys(Data)}).
+
+update_delta({_, InitialDataMap}, DataMap) ->
+ update_delta(InitialDataMap, DataMap);
+update_delta(InitialDataMap, DataMap) ->
+ Delta = maps:fold(
+ fun(Key, Value, AccIn) ->
+ maps:put(Key, maps:get(Key, DataMap, Value) - Value, AccIn)
+ end,
+ maps:new(),
+ InitialDataMap
+ ),
+ {Delta, InitialDataMap}.
+
+analyze_resource_hoggers({N, Data, InfoKeys}, TopN) ->
+ io:format("Number of snapshots: ~p~n", [N]),
+ lists:map(
+ fun(InfoKey) ->
+ KeyFun = fun
+ ({_Pid, _Id, undefined}) -> undefined;
+ ({_Pid, Id, {_Delta, DataMap}}) -> {Id, [{InfoKey,
maps:get(InfoKey, DataMap)}]}
Review Comment:
For example, the first map in the following is the `Delta` and the second
map is `DataMap`. This is from a call to `resource_hoggers_snapshot`.
```
{1,
[{<0.0.0>,"init[<0.0.0>]",
{#{binary => 0,dictionary => 0,heap_size => 0,links => 0,
memory => 0,message_queue_len => 0,monitored_by => 0,
monitors => 0,stack_size => 0,total_heap_size => 0},
#{binary => 0,dictionary => 0,heap_size => 2586,links => 3,
memory => 34384,message_queue_len => 0,monitored_by => 0,
monitors => 0,stack_size => 3,total_heap_size => 4188}}},
{<0.1.0>,"erts_code_purger[<0.1.0>]",
{#{binary => 0,dictionary => 0,heap_size => 0,links => 0,
memory => 0,message_queue_len => 0,monitored_by => 0,
monitors => 0,stack_size => 0,total_heap_size => 0},
#{binary => 0,dictionary => 0,heap_size => 233,links => 0,
memory => 3256,message_queue_len => 0,monitored_by => 0,
monitors => 0,stack_size => 2,total_heap_size => 312}}},
...
```
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