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%% -------------------------------------------------------------------
%%
%% riaknostic - automated diagnostic tools for Riak
%%
%% Copyright (c) 2011 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------
%% @doc Diagnostic that checks Riak's current memory usage. If memory
%% usage is high, a warning message will be sent, otherwise only
%% informational messages.
-module(riaknostic_check_memory_use).
-behaviour(riaknostic_check).
-export([description/0,
valid/0,
check/0,
format/1]).
-spec description() -> string().
description() ->
"Measure memory usage".
-spec valid() -> boolean().
valid() ->
riaknostic_node:can_connect().
-spec check() -> [{lager:log_level(), term()}].
check() ->
Pid = riaknostic_node:pid(),
Output = riaknostic_util:run_command("ps -o pmem,rss -p " ++ Pid),
[_,_,Percent, RealSize| _] = string:tokens(Output, "/n \n"),
Messages = [
{info, {process_usage, Percent, RealSize}}
],
case riaknostic_util:binary_to_float(list_to_binary(Percent)) >= 90 of
false ->
Messages;
true ->
[{critical, {high_memory, Percent}} | Messages]
end.
-spec format(term()) -> {io:format(), [term()]}.
format({high_memory, Percent}) ->
{"Riak memory usage is HIGH: ~s% of available RAM", [Percent]};
format({process_usage, Percent, Real}) ->
{"Riak process is using ~s% of available RAM, totalling ~s KB of real memory.", [Percent, Real]}.
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