iilyak commented on code in PR #3985:
URL: https://github.com/apache/couchdb/pull/3985#discussion_r877472990
##########
src/couch/src/couch_debug.erl:
##########
@@ -335,6 +338,63 @@ 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 it as a
first snapshot into
+ `resource_hoggers_snapshot/1`. Then, periodically call
`resource_hoggers_snapshot/1` and pass in
+ the previous snapshot.
+
+ Here is an example 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]),
Review Comment:
You need to escape `~` as well.
```
io:format(\"Snapshot ~~p/10~~n\", [I]),
```
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