diff options
Diffstat (limited to 'erts/emulator/test/efile_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/efile_SUITE.erl | 88 |
1 files changed, 83 insertions, 5 deletions
diff --git a/erts/emulator/test/efile_SUITE.erl b/erts/emulator/test/efile_SUITE.erl index 65367eab98..f79bb761d1 100644 --- a/erts/emulator/test/efile_SUITE.erl +++ b/erts/emulator/test/efile_SUITE.erl @@ -19,16 +19,16 @@ -module(efile_SUITE). -export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, init_per_group/2,end_per_group/2]). --export([iter_max_files/1]). +-export([iter_max_files/1, async_dist/1]). --export([do_iter_max_files/2]). +-export([do_iter_max_files/2, do_async_dist/1]). -include_lib("test_server/include/test_server.hrl"). suite() -> [{ct_hooks,[ts_install_cth]}]. all() -> - [iter_max_files]. + [iter_max_files, async_dist]. groups() -> []. @@ -45,6 +45,84 @@ init_per_group(_GroupName, Config) -> end_per_group(_GroupName, Config) -> Config. +do_async_dist(Dir) -> + X = 100, + AT = erlang:system_info(thread_pool_size), + Keys = file_keys(Dir,AT*X,[],[]), + Tab = ets:new(x,[ordered_set]), + [ ets:insert(Tab,{N,0}) || N <- lists:seq(0,AT-1) ], + [ ets:update_counter(Tab,(N rem AT),1) || N <- Keys ], + Res = [ V || {_,V} <- ets:tab2list(Tab) ], + ets:delete(Tab), + {Res, sdev(Res)/X}. + +sdev(List) -> + Len = length(List), + Mean = lists:sum(List)/Len, + math:sqrt(lists:sum([ (X - Mean) * (X - Mean) || X <- List ]) / Len). + +file_keys(_,0,FdList,FnList) -> + [ file:close(FD) || FD <- FdList ], + [ file:delete(FN) || FN <- FnList ], + []; +file_keys(Dir,Num,FdList,FnList) -> + Name = "dummy"++integer_to_list(Num), + FN = filename:join([Dir,Name]), + case file:open(FN,[write,raw]) of + {ok,FD} -> + {file_descriptor,prim_file,{Port,_}} = FD, + <<X:32/integer-big>> = + iolist_to_binary(erlang:port_control(Port,$K,[])), + [X | file_keys(Dir,Num-1,[FD|FdList],[FN|FnList])]; + {error,_} -> + % Try freeing up FD's if there are any + case FdList of + [] -> + exit({cannot_open_file,FN}); + _ -> + [ file:close(FD) || FD <- FdList ], + [ file:delete(F) || F <- FnList ], + file_keys(Dir,Num,[],[]) + end + end. + +async_dist(doc) -> + "Check that the distribution of files over async threads is fair"; +async_dist(Config) when is_list(Config) -> + DataDir = ?config(data_dir,Config), + TestFile = filename:join(DataDir, "existing_file"), + Dir = filename:dirname(code:which(?MODULE)), + AsyncSizes = [7,10,100,255,256,64,63,65], + Max = 0.5, + + lists:foreach(fun(Size) -> + {ok,Node} = + test_server:start_node + (test_iter_max_files,slave, + [{args, + "+A "++integer_to_list(Size)++ + " -pa " ++ Dir}]), + {Distr,SD} = rpc:call(Node,?MODULE,do_async_dist, + [DataDir]), + test_server:stop_node(Node), + if + SD > Max -> + io:format("Bad async queue distribution for " + "~p async threads:~n" + " Standard deviation is ~p~n" + " Key distribution:~n ~lp~n", + [Size,SD,Distr]), + exit({bad_async_dist,Size,SD,Distr}); + true -> + io:format("OK async queue distribution for " + "~p async threads:~n" + " Standard deviation is ~p~n" + " Key distribution:~n ~lp~n", + [Size,SD,Distr]), + ok + end + end, AsyncSizes), + ok. %% %% Open as many files as possible. Do this several times and check @@ -98,7 +176,7 @@ open_files(Name) -> ?line case file:open(Name, [read,raw]) of {ok, Fd} -> [Fd| open_files(Name)]; - {error, Reason} -> -% io:format("Error reason: ~p", [Reason]), + {error, _Reason} -> +% io:format("Error reason: ~p", [_Reason]), [] end. |