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+%%%-------------------------------------------------------------------
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017-2019. All Rights Reserved.
+%%
+%% Licensed 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.
+%%
+%% %CopyrightEnd%
+%%
+-module(ssl_dist_bench_SUITE).
+
+-include_lib("common_test/include/ct_event.hrl").
+-include_lib("public_key/include/public_key.hrl").
+
+%% CT meta
+-export([suite/0, all/0, groups/0,
+ init_per_suite/1, end_per_suite/1,
+ init_per_group/2, end_per_group/2,
+ init_per_testcase/2, end_per_testcase/2]).
+
+%% Test cases
+-export(
+ [setup/1,
+ roundtrip/1,
+ throughput_0/1,
+ throughput_64/1,
+ throughput_1024/1,
+ throughput_4096/1,
+ throughput_16384/1,
+ throughput_65536/1,
+ throughput_262144/1,
+ throughput_1048576/1]).
+
+%% Debug
+-export([payload/1, roundtrip_runner/3, setup_runner/3, throughput_runner/4]).
+
+%%%-------------------------------------------------------------------
+
+suite() -> [{ct_hooks, [{ts_install_cth, [{nodenames, 2}]}]}].
+
+all() -> [{group, ssl}, {group, plain}].
+
+groups() ->
+ [{ssl, all_groups()},
+ {plain, all_groups()},
+ %%
+ {setup, [{repeat, 1}], [setup]},
+ {roundtrip, [{repeat, 1}], [roundtrip]},
+ {throughput, [{repeat, 1}],
+ [throughput_0,
+ throughput_64,
+ throughput_1024,
+ throughput_4096,
+ throughput_16384,
+ throughput_65536,
+ throughput_262144,
+ throughput_1048576]}].
+
+all_groups() ->
+ [{group, setup},
+ {group, roundtrip},
+ {group, throughput}].
+
+init_per_suite(Config) ->
+ Digest = sha1,
+ ECCurve = secp521r1,
+ TLSVersion = 'tlsv1.2',
+ TLSCipher = {ecdhe_ecdsa,aes_128_cbc,sha256,sha256},
+ %%
+ Node = node(),
+ try
+ Node =/= nonode@nohost orelse
+ throw({skipped,"Node not distributed"}),
+ verify_node_src_addr(),
+ {supported, SSLVersions} =
+ lists:keyfind(supported, 1, ssl:versions()),
+ lists:member(TLSVersion, SSLVersions) orelse
+ throw(
+ {skipped,
+ "SSL does not support " ++ term_to_string(TLSVersion)}),
+ lists:member(ECCurve, ssl:eccs(TLSVersion)) orelse
+ throw(
+ {skipped,
+ "SSL does not support " ++ term_to_string(ECCurve)}),
+ lists:member(TLSCipher, ssl:cipher_suites()) orelse
+ throw(
+ {skipped,
+ "SSL does not support " ++ term_to_string(TLSCipher)})
+ of
+ _ ->
+ PrivDir = proplists:get_value(priv_dir, Config),
+ %%
+ [_, HostA] = split_node(Node),
+ NodeAName = ?MODULE_STRING ++ "_node_a",
+ NodeAString = NodeAName ++ "@" ++ HostA,
+ NodeAConfFile = filename:join(PrivDir, NodeAString ++ ".conf"),
+ NodeA = list_to_atom(NodeAString),
+ %%
+ ServerNode = ssl_bench_test_lib:setup(dist_server),
+ [_, HostB] = split_node(ServerNode),
+ NodeBName = ?MODULE_STRING ++ "_node_b",
+ NodeBString = NodeBName ++ "@" ++ HostB,
+ NodeBConfFile = filename:join(PrivDir, NodeBString ++ ".conf"),
+ NodeB = list_to_atom(NodeBString),
+ %%
+ CertOptions =
+ [{digest, Digest},
+ {key, {namedCurve, ECCurve}}],
+ RootCert =
+ public_key:pkix_test_root_cert(
+ ?MODULE_STRING ++ " ROOT CA", CertOptions),
+ SSLConf =
+ [{verify, verify_peer},
+ {versions, [TLSVersion]},
+ {ciphers, [TLSCipher]}],
+ ServerConf =
+ [{fail_if_no_peer_cert, true},
+ {verify_fun,
+ {fun inet_tls_dist:verify_client/3,[]}}
+ | SSLConf],
+ ClientConf = SSLConf,
+ %%
+ write_node_conf(
+ NodeAConfFile, NodeA, ServerConf, ClientConf,
+ CertOptions, RootCert),
+ write_node_conf(
+ NodeBConfFile, NodeB, ServerConf, ClientConf,
+ CertOptions, RootCert),
+ %%
+ [{node_a_name, NodeAName},
+ {node_a, NodeA},
+ {node_a_dist_args,
+ "-proto_dist inet_tls "
+ "-ssl_dist_optfile " ++ NodeAConfFile ++ " "},
+ {node_b_name, NodeBName},
+ {node_b, NodeB},
+ {node_b_dist_args,
+ "-proto_dist inet_tls "
+ "-ssl_dist_optfile " ++ NodeBConfFile ++ " "},
+ {server_node, ServerNode}
+ |Config]
+ catch
+ throw:Result ->
+ Result
+ end.
+
+end_per_suite(Config) ->
+ ServerNode = proplists:get_value(server_node, Config),
+ slave:stop(ServerNode).
+
+init_per_group(ssl, Config) ->
+ [{ssl_dist, true}, {ssl_dist_prefix, "SSL"}|Config];
+init_per_group(plain, Config) ->
+ [{ssl_dist, false}, {ssl_dist_prefix, "Plain"}|Config];
+init_per_group(_GroupName, Config) ->
+ Config.
+
+end_per_group(_GroupName, _Config) ->
+ ok.
+
+init_per_testcase(_Func, Conf) ->
+ Conf.
+
+end_per_testcase(_Func, _Conf) ->
+ ok.
+
+-define(COUNT, 400).
+
+%%%-------------------------------------------------------------------
+%%% CommonTest API helpers
+
+verify_node_src_addr() ->
+ Msg = "Hello, world!",
+ {ok,Host} = inet:gethostname(),
+ {ok,DstAddr} = inet:getaddr(Host, inet),
+ {ok,Socket} = gen_udp:open(0, [{active,false}]),
+ {ok,Port} = inet:port(Socket),
+ ok = gen_udp:send(Socket, DstAddr, Port, Msg),
+ case gen_udp:recv(Socket, length(Msg) + 1, 1000) of
+ {ok,{DstAddr,Port,Msg}} ->
+ ok;
+ {ok,{SrcAddr,Port,Msg}} ->
+ throw({skipped,
+ "Src and dst address mismatch: " ++
+ term_to_string(SrcAddr) ++ " =:= " ++
+ term_to_string(DstAddr)});
+ Weird ->
+ error(Weird)
+ end.
+
+write_node_conf(
+ ConfFile, Node, ServerConf, ClientConf, CertOptions, RootCert) ->
+ [Name,Host] = split_node(Node),
+ Conf =
+ public_key:pkix_test_data(
+ #{root => RootCert,
+ peer =>
+ [{extensions,
+ [
+ #'Extension'{
+ extnID = ?'id-ce-subjectAltName',
+ extnValue = [{dNSName, Host}],
+ critical = true},
+ #'Extension'{
+ extnID = ?'id-ce-subjectAltName',
+ extnValue =
+ [{directoryName,
+ {rdnSequence,
+ [[#'AttributeTypeAndValue'{
+ type = ?'id-at-commonName',
+ value =
+ {utf8String,
+ unicode:characters_to_binary(
+ Name, utf8)
+ }
+ }]]}}],
+ critical = true}
+ ]} | CertOptions]}),
+ NodeConf =
+ [{server, ServerConf ++ Conf}, {client, ClientConf ++ Conf}],
+ {ok, Fd} = file:open(ConfFile, [write]),
+ ok = file:change_mode(ConfFile, 8#400),
+ io:format(Fd, "~p.~n", [NodeConf]),
+ ok = file:close(Fd).
+
+split_node(Node) ->
+ string:split(atom_to_list(Node), "@").
+
+%%%-------------------------------------------------------------------
+%%% Test cases
+
+%%-----------------------
+%% Connection setup speed
+
+setup(Config) ->
+ run_nodepair_test(fun setup/5, Config).
+
+setup(A, B, Prefix, HA, HB) ->
+ Rounds = 50,
+ [] = ssl_apply(HA, erlang, nodes, []),
+ [] = ssl_apply(HB, erlang, nodes, []),
+ {SetupTime, CycleTime} =
+ ssl_apply(HA, fun () -> setup_runner(A, B, Rounds) end),
+ ok = ssl_apply(HB, fun () -> setup_wait_nodedown(A, 10000) end),
+ %% [] = ssl_apply(HA, erlang, nodes, []),
+ %% [] = ssl_apply(HB, erlang, nodes, []),
+ SetupSpeed = round((Rounds*1000000*1000) / SetupTime),
+ CycleSpeed = round((Rounds*1000000*1000) / CycleTime),
+ _ = report(Prefix++" Setup", SetupSpeed, "setups/1000s"),
+ report(Prefix++" Setup Cycle", CycleSpeed, "cycles/1000s").
+
+%% Runs on node A against rex in node B
+setup_runner(A, B, Rounds) ->
+ StartTime = start_time(),
+ SetupTime = setup_loop(A, B, 0, Rounds),
+ {microseconds(SetupTime), microseconds(elapsed_time(StartTime))}.
+
+setup_loop(_A, _B, T, 0) ->
+ T;
+setup_loop(A, B, T, N) ->
+ StartTime = start_time(),
+ [N,A] = [N|rpc:block_call(B, erlang, nodes, [])],
+ Time = elapsed_time(StartTime),
+ [N,B] = [N|erlang:nodes()],
+ Mref = erlang:monitor(process, {rex,B}),
+ true = net_kernel:disconnect(B),
+ receive
+ {'DOWN',Mref,process,_,_} ->
+ [] = erlang:nodes(),
+ setup_loop(A, B, Time + T, N - 1)
+ end.
+
+setup_wait_nodedown(A, Time) ->
+ ok = net_kernel:monitor_nodes(true),
+ case nodes() of
+ [] ->
+ ok;
+ [A] ->
+ receive
+ {nodedown,A} ->
+ ok;
+ Unexpected ->
+ {error,{unexpected,Unexpected}}
+ after Time ->
+ {error,timeout}
+ end
+ end.
+
+
+%%----------------
+%% Roundtrip speed
+
+roundtrip(Config) ->
+ run_nodepair_test(fun roundtrip/5, Config).
+
+roundtrip(A, B, Prefix, HA, HB) ->
+ Rounds = 40000,
+ [] = ssl_apply(HA, erlang, nodes, []),
+ [] = ssl_apply(HB, erlang, nodes, []),
+ ok = ssl_apply(HA, net_kernel, allow, [[B]]),
+ ok = ssl_apply(HB, net_kernel, allow, [[A]]),
+ Time = ssl_apply(HA, fun () -> roundtrip_runner(A, B, Rounds) end),
+ [B] = ssl_apply(HA, erlang, nodes, []),
+ [A] = ssl_apply(HB, erlang, nodes, []),
+ Speed = round((Rounds*1000000) / Time),
+ report(Prefix++" Roundtrip", Speed, "pings/s").
+
+%% Runs on node A and spawns a server on node B
+roundtrip_runner(A, B, Rounds) ->
+ ClientPid = self(),
+ [A] = rpc:call(B, erlang, nodes, []),
+ ServerPid =
+ erlang:spawn(
+ B,
+ fun () -> roundtrip_server(ClientPid, Rounds) end),
+ ServerMon = erlang:monitor(process, ServerPid),
+ microseconds(
+ roundtrip_client(ServerPid, ServerMon, start_time(), Rounds)).
+
+roundtrip_server(_Pid, 0) ->
+ ok;
+roundtrip_server(Pid, N) ->
+ receive
+ N ->
+ Pid ! N,
+ roundtrip_server(Pid, N-1)
+ end.
+
+roundtrip_client(_Pid, Mon, StartTime, 0) ->
+ Time = elapsed_time(StartTime),
+ receive
+ {'DOWN', Mon, _, _, normal} ->
+ Time;
+ {'DOWN', Mon, _, _, Other} ->
+ exit(Other)
+ end;
+roundtrip_client(Pid, Mon, StartTime, N) ->
+ Pid ! N,
+ receive
+ N ->
+ roundtrip_client(Pid, Mon, StartTime, N - 1)
+ end.
+
+
+%%-----------------
+%% Throughput speed
+
+throughput_0(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 500000, 0)
+ end, Config).
+
+throughput_64(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 500000, 64)
+ end, Config).
+
+throughput_1024(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 100000, 1024)
+ end, Config).
+
+throughput_4096(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 50000, 4096)
+ end, Config).
+
+throughput_16384(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 10000, 16384)
+ end, Config).
+
+throughput_65536(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 2000, 65536)
+ end, Config).
+
+throughput_262144(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 500, 262144)
+ end, Config).
+
+throughput_1048576(Config) ->
+ run_nodepair_test(
+ fun (A, B, Prefix, HA, HB) ->
+ throughput(A, B, Prefix, HA, HB, 200, 1048576)
+ end, Config).
+
+throughput(A, B, Prefix, HA, HB, Packets, Size) ->
+ [] = ssl_apply(HA, erlang, nodes, []),
+ [] = ssl_apply(HB, erlang, nodes, []),
+ #{time := Time,
+ client_dist_stats := ClientDistStats,
+ client_msacc_stats := ClientMsaccStats,
+ client_prof := ClientProf,
+ server_msacc_stats := ServerMsaccStats,
+ server_prof := ServerProf,
+ server_gc_before := Server_GC_Before,
+ server_gc_after := Server_GC_After} =
+ ssl_apply(HA, fun () -> throughput_runner(A, B, Packets, Size) end),
+ [B] = ssl_apply(HA, erlang, nodes, []),
+ [A] = ssl_apply(HB, erlang, nodes, []),
+ ClientMsaccStats =:= undefined orelse
+ msacc:print(ClientMsaccStats),
+ io:format("ClientDistStats: ~p~n", [ClientDistStats]),
+ Overhead =
+ 50 % Distribution protocol headers (empirical) (TLS+=54)
+ + byte_size(erlang:term_to_binary([0|<<>>])), % Benchmark overhead
+ Bytes = Packets * (Size + Overhead),
+ io:format("~w bytes, ~.4g s~n", [Bytes,Time/1000000]),
+ ClientMsaccStats =:= undefined orelse
+ io:format(
+ "Sender core usage ratio: ~.4g ns/byte~n",
+ [msacc:stats(system_runtime, ClientMsaccStats)*1000/Bytes]),
+ ServerMsaccStats =:= undefined orelse
+ begin
+ io:format(
+ "Receiver core usage ratio: ~.4g ns/byte~n",
+ [msacc:stats(system_runtime, ServerMsaccStats)*1000/Bytes]),
+ msacc:print(ServerMsaccStats)
+ end,
+ io:format("******* ClientProf:~n", []), prof_print(ClientProf),
+ io:format("******* ServerProf:~n", []), prof_print(ServerProf),
+ io:format("******* Server GC Before:~n~p~n", [Server_GC_Before]),
+ io:format("******* Server GC After:~n~p~n", [Server_GC_After]),
+ Speed = round((Bytes * 1000000) / (1024 * Time)),
+ report(Prefix++" Throughput_"++integer_to_list(Size), Speed, "kB/s").
+
+%% Runs on node A and spawns a server on node B
+throughput_runner(A, B, Rounds, Size) ->
+ Payload = payload(Size),
+ [A] = rpc:call(B, erlang, nodes, []),
+ ClientPid = self(),
+ ServerPid =
+ erlang:spawn(
+ B,
+ fun () -> throughput_server(ClientPid, Rounds) end),
+ ServerMon = erlang:monitor(process, ServerPid),
+ msacc:available() andalso
+ begin
+ msacc:stop(),
+ msacc:reset(),
+ msacc:start(),
+ ok
+ end,
+ prof_start(),
+ #{time := Time} = Result =
+ throughput_client(ServerPid, ServerMon, Payload, Rounds),
+ prof_stop(),
+ MsaccStats =
+ case msacc:available() of
+ true ->
+ MStats = msacc:stats(),
+ msacc:stop(),
+ MStats;
+ false ->
+ undefined
+ end,
+ Prof = prof_end(),
+ [{_Node,Socket}] = dig_dist_node_sockets(),
+ DistStats = inet:getstat(Socket),
+ Result#{time := microseconds(Time),
+ client_dist_stats => DistStats,
+ client_msacc_stats => MsaccStats,
+ client_prof => Prof}.
+
+dig_dist_node_sockets() ->
+ [case DistCtrl of
+ {_Node,Socket} = NodeSocket when is_port(Socket) ->
+ NodeSocket;
+ {Node,DistCtrlPid} when is_pid(DistCtrlPid) ->
+ [{links,DistCtrlLinks}] = process_info(DistCtrlPid, [links]),
+ case [S || S <- DistCtrlLinks, is_port(S)] of
+ [Socket] ->
+ {Node,Socket};
+ [] ->
+ [{monitors,[{process,DistSenderPid}]}] =
+ process_info(DistCtrlPid, [monitors]),
+ [{links,DistSenderLinks}] =
+ process_info(DistSenderPid, [links]),
+ [Socket] = [S || S <- DistSenderLinks, is_port(S)],
+ {Node,Socket}
+ end
+ end || DistCtrl <- erlang:system_info(dist_ctrl)].
+
+
+throughput_server(Pid, N) ->
+ GC_Before = get_server_gc_info(),
+ %% dbg:tracer(port, dbg:trace_port(file, "throughput_server_gc.log")),
+ %% dbg:p(TLSDistReceiver, garbage_collection),
+ msacc:available() andalso
+ begin
+ msacc:stop(),
+ msacc:reset(),
+ msacc:start(),
+ ok
+ end,
+ prof_start(),
+ throughput_server_loop(Pid, GC_Before, N).
+
+throughput_server_loop(_Pid, GC_Before, 0) ->
+ prof_stop(),
+ MsaccStats =
+ case msacc:available() of
+ true ->
+ msacc:stop(),
+ MStats = msacc:stats(),
+ msacc:reset(),
+ MStats;
+ false ->
+ undefined
+ end,
+ Prof = prof_end(),
+ %% dbg:flush_trace_port(),
+ exit(#{server_msacc_stats => MsaccStats,
+ server_prof => Prof,
+ server_gc_before => GC_Before,
+ server_gc_after => get_server_gc_info()});
+throughput_server_loop(Pid, GC_Before, N) ->
+ receive
+ {Pid, N, _} ->
+ throughput_server_loop(Pid, GC_Before, N-1)
+ end.
+
+get_server_gc_info() ->
+ case whereis(ssl_connection_sup_dist) of
+ undefined ->
+ undefined;
+ SupPid ->
+ [{_Id,TLSDistReceiver,_Type,_Modules}|_] =
+ supervisor:which_children(SupPid),
+ erlang:process_info(
+ TLSDistReceiver, [garbage_collection,garbage_collection_info])
+ end.
+
+throughput_client(Pid, Mon, Payload, N) ->
+ throughput_client_loop(Pid, Mon, Payload, N, start_time()).
+
+throughput_client_loop(_Pid, Mon, _Payload, 0, StartTime) ->
+ receive
+ {'DOWN', Mon, _, _, #{} = Result} ->
+ Result#{time => elapsed_time(StartTime)};
+ {'DOWN', Mon, _, _, Other} ->
+ exit(Other)
+ end;
+throughput_client_loop(Pid, Mon, Payload, N, StartTime) ->
+ Pid ! {self(), N, Payload},
+ throughput_client_loop(Pid, Mon, Payload, N - 1, StartTime).
+
+
+-define(prof, none). % none | cprof | eprof
+
+-if(?prof =:= cprof).
+prof_start() ->
+ cprof:stop(),
+ cprof:start(),
+ ok.
+-elif(?prof =:= eprof).
+prof_start() ->
+ catch eprof:stop(),
+ {ok,_} = eprof:start(),
+ profiling = eprof:start_profiling(processes()),
+ ok.
+-elif(?prof =:= none).
+prof_start() ->
+ ok.
+-endif.
+
+-if(?prof =:= cprof).
+prof_stop() ->
+ cprof:pause(),
+ ok.
+-elif(?prof =:= eprof).
+prof_stop() ->
+ _ = eprof:stop_profiling(),
+ ok.
+-elif(?prof =:= none).
+prof_stop() ->
+ ok.
+-endif.
+
+-if(?prof =:= cprof).
+prof_end() ->
+ Prof = cprof:analyse(),
+ cprof:stop(),
+ Prof.
+-elif(?prof =:= eprof).
+prof_end() ->
+ eprof:dump_data().
+-elif(?prof =:= none).
+prof_end() ->
+ [].
+-endif.
+
+-if(?prof =:= cprof).
+prof_print(Prof) ->
+ io:format("~p.~n", [Prof]).
+-elif(?prof =:= eprof).
+prof_print(Dump) ->
+ eprof:analyze(undefined, total, [], Dump).
+-elif(?prof =:= none).
+prof_print([]) ->
+ ok.
+-endif.
+
+%%%-------------------------------------------------------------------
+%%% Test cases helpers
+
+run_nodepair_test(TestFun, Config) ->
+ A = proplists:get_value(node_a, Config),
+ B = proplists:get_value(node_b, Config),
+ Prefix = proplists:get_value(ssl_dist_prefix, Config),
+ HA = start_ssl_node_a(Config),
+ HB = start_ssl_node_b(Config),
+ try TestFun(A, B, Prefix, HA, HB)
+ after
+ stop_ssl_node_a(HA),
+ stop_ssl_node_b(HB, Config),
+ ok
+ end.
+
+ssl_apply(Handle, M, F, Args) ->
+ case ssl_dist_test_lib:apply_on_ssl_node(Handle, M, F, Args) of
+ {'EXIT',Reason} ->
+ error(Reason);
+ Result ->
+ Result
+ end.
+
+ssl_apply(Handle, Fun) ->
+ case ssl_dist_test_lib:apply_on_ssl_node(Handle, Fun) of
+ {'EXIT',Reason} ->
+ error(Reason);
+ Result ->
+ Result
+ end.
+
+start_ssl_node_a(Config) ->
+ Name = proplists:get_value(node_a_name, Config),
+ Args = get_node_args(node_a_dist_args, Config),
+ ssl_dist_test_lib:start_ssl_node(Name, Args).
+
+start_ssl_node_b(Config) ->
+ Name = proplists:get_value(node_b_name, Config),
+ Args = get_node_args(node_b_dist_args, Config),
+ ServerNode = proplists:get_value(server_node, Config),
+ rpc:call(
+ ServerNode, ssl_dist_test_lib, start_ssl_node, [Name, Args]).
+
+stop_ssl_node_a(HA) ->
+ ssl_dist_test_lib:stop_ssl_node(HA).
+
+stop_ssl_node_b(HB, Config) ->
+ ServerNode = proplists:get_value(server_node, Config),
+ rpc:call(ServerNode, ssl_dist_test_lib, stop_ssl_node, [HB]).
+
+get_node_args(Tag, Config) ->
+ case proplists:get_value(ssl_dist, Config) of
+ true ->
+ proplists:get_value(Tag, Config);
+ false ->
+ ""
+ end.
+
+
+
+payload(Size) ->
+ iolist_to_binary(
+ [case Size bsr 8 of
+ 0 ->
+ [];
+ Blocks ->
+ payload(Blocks, create_binary(256))
+ end | create_binary(Size band 255)]).
+%%
+payload(0, _) ->
+ [];
+payload(Blocks, Block) ->
+ Half = payload(Blocks bsr 1, Block),
+ [Half, Half |
+ if
+ Blocks band 1 =:= 1 ->
+ Block;
+ true ->
+ []
+ end].
+
+create_binary(Size) ->
+ create_binary(Size, <<>>).
+%%
+create_binary(0, Bin) ->
+ Bin;
+create_binary(Size, Bin) ->
+ NextSize = Size - 1,
+ create_binary(NextSize, <<Bin/binary, NextSize>>).
+
+start_time() ->
+ erlang:system_time().
+
+elapsed_time(StartTime) ->
+ erlang:system_time() - StartTime.
+
+microseconds(Time) ->
+ erlang:convert_time_unit(Time, native, microsecond).
+
+report(Name, Value, Unit) ->
+ ct:pal("~s: ~w ~s", [Name, Value, Unit]),
+ ct_event:notify(
+ #event{
+ name = benchmark_data,
+ data = [{value, Value}, {suite, "ssl_dist"}, {name, Name}]}),
+ {comment, term_to_string(Value) ++ " " ++ Unit}.
+
+term_to_string(Term) ->
+ unicode:characters_to_list(
+ io_lib:write(Term, [{encoding, unicode}])).