iilyak commented on code in PR #3985:
URL: https://github.com/apache/couchdb/pull/3985#discussion_r877457402
##########
src/couch/src/couch_debug.erl:
##########
@@ -335,6 +338,50 @@ help(print_tree) ->
- TableSpec: List of either {Value} or {Width, Align, Value}
where Align is either left/center/right.
+ ---
+ ", []);
+help(resource_hoggers) ->
+ io:format("
+ resource_hoggers(MemoryInfo, InfoKey)
+ --------------------------------
+
+ Prints the top processes hogging resources along with the value
associated with InfoKey.
+ - MemoryInfo: Data map containing values for a set of InfoKeys
+ (same structure returned by memory_info)
+ - InfoKey: Desired key to obtain value for. The supported keys are
+ binary, dictionary, heap_size, links, memory, message_queue_len,
monitored_by,
+ monitors, stack_size, and total_heap_size
+
+ ---
+ ", []);
+help(resource_hoggers_snapshot) ->
+ io:format("
+ resource_hoggers_snapshot(MemoryInfo)
+ resource_hoggers_snapshot(PreviousSnapshot)
+ --------------------------------
+
+ Prints a snapshot of the top processes hogging resources.
+ - MemoryInfo: Data map containing values for a set of InfoKeys
+ (same structure returned by memory_info)
+ - PreviousSnapshot: Previous snapshot of resource hoggers
+
+ An example workflow is to call `memory_info(Pids)` and pass this into
`resource_hoggers_snapshot/1` along
Review Comment:
An example workflow is to call `memory_info(Pids)` and pass it as a first
snapshot into `resource_hoggers_snapshot/1`. Then periodically call
`resource_hoggers_snapshot/1` passing previous snapshot.
Here is one possible use case.
```
S0 = couch_debug:memory_info(erlang:processes()).
Summary = lists:foldl(fun(I, S) ->
timer:sleep(1000),
io:format("Snapshot ~p/10~n", [I]),
couch_debug:resource_hoggers_snapshot(S)
end, S0, lists:seq(1, 10)).
couch_debug:analyze_resource_hoggers(Summary, 10).
```
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