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Diffstat (limited to 'src/file_handle_cache_stats.erl')
-rw-r--r-- | src/file_handle_cache_stats.erl | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/file_handle_cache_stats.erl b/src/file_handle_cache_stats.erl new file mode 100644 index 00000000..832f0b3d --- /dev/null +++ b/src/file_handle_cache_stats.erl @@ -0,0 +1,60 @@ +%% The contents of this file are subject to the Mozilla Public License +%% Version 1.1 (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.mozilla.org/MPL/ +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and +%% limitations under the License. +%% +%% The Original Code is RabbitMQ. +%% +%% The Initial Developer of the Original Code is GoPivotal, Inc. +%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved. +%% + +-module(file_handle_cache_stats). + +%% stats about read / write operations that go through the fhc. + +-export([init/0, update/3, update/2, update/1, get/0]). + +-define(TABLE, ?MODULE). + +init() -> + ets:new(?TABLE, [public, named_table]), + [ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- [read, write], + Counter <- [count, bytes, time]], + [ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- [sync, seek], + Counter <- [count, time]], + [ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- [reopen], + Counter <- [count]]. + +update(Op, Bytes, Thunk) -> + {Time, Res} = timer_tc(Thunk), + ets:update_counter(?TABLE, {Op, count}, 1), + ets:update_counter(?TABLE, {Op, bytes}, Bytes), + ets:update_counter(?TABLE, {Op, time}, Time), + Res. + +update(Op, Thunk) -> + {Time, Res} = timer_tc(Thunk), + ets:update_counter(?TABLE, {Op, count}, 1), + ets:update_counter(?TABLE, {Op, time}, Time), + Res. + +update(Op) -> + ets:update_counter(?TABLE, {Op, count}, 1), + ok. + +get() -> + lists:sort(ets:tab2list(?TABLE)). + +%% TODO timer:tc/1 was introduced in R14B03; use that function once we +%% require that version. +timer_tc(Thunk) -> + T1 = os:timestamp(), + Res = Thunk(), + T2 = os:timestamp(), + {timer:now_diff(T2, T1), Res}. |