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<H1>[99s-extend] cowboy how to ruduce the memory usage per long-hold connection</H1>
<B>rambocoder</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20cowboy%20how%20to%20ruduce%20the%20memory%20usage%20per%0A%09long-hold%20connection&In-Reply-To=%3CCAJ0zLRPcYmH1OXeiw2aZHLtoqqdW%3Ddu0rhonF53xdCbMUmnCLw%40mail.gmail.com%3E"
TITLE="[99s-extend] cowboy how to ruduce the memory usage per long-hold connection">erlang at rambocoder.com
</A><BR>
<I>Fri Apr 26 15:11:53 CEST 2013</I>
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<PRE>Is 13.6K/connection considered a lot? Once you start doing SSL, each
connection will be about 80K, IMHO the most important factor for huge
ammount of COMET users is latency, which Cowboy and Erlang do great.
-rambocoder
On Fri, Apr 26, 2013 at 2:11 AM, yongboy <<A HREF="https://lists.ninenines.eu/listinfo/extend">yongboy at gmail.com</A>> wrote:
><i> I have tested one long-hold webapp, when 512000 user connected, the app
</I>><i> used
</I>><i> 6801M memory, 6801M*1024K / 512000 = 13.6K/Connection.
</I>><i>
</I>><i> Does anyone give me some advice on how to reduce the memory usage per one
</I>><i> connection, thanks very much !
</I>><i>
</I>><i> Here is the code snippet:
</I>><i>
</I>><i> start(_Type, _Args) ->
</I>><i> Dispatch = cowboy_router:compile([
</I>><i> {'_', [{'_', htmlfile_handler, []}]}
</I>><i> ]),
</I>><i> cowboy:start_http(my_http_listener, 100,
</I>><i> [{port, 8000}, {max_connections, infinity}],
</I>><i> [{env, [{dispatch, Dispatch}]}]
</I>><i> ),
</I>><i> count_server:start(),
</I>><i> htmlfilesimple_sup:start_link().
</I>><i>
</I>><i> ......
</I>><i>
</I>><i> -module(htmlfile_handler).
</I>><i> -behaviour(cowboy_loop_handler).
</I>><i> -export([init/3, info/3, terminate/3]).
</I>><i> -define(HEARBEAT_TIMEOUT, 20*1000).
</I>><i> -record(status, {count=0}).
</I>><i>
</I>><i> init(_Any, Req, State) ->
</I>><i> NowCount = count_server:welcome(),
</I>><i> io:format("online user ~p :))~n", [NowCount]),
</I>><i>
</I>><i> output_first(Req),
</I>><i> Req2 = cowboy_req:compact(Req),
</I>><i> {loop, Req2, State, hibernate}.
</I>><i>
</I>><i> %% POST/Short Request
</I>><i> info(_Any, Req, State) ->
</I>><i> {loop, Req, State, hibernate}.
</I>><i>
</I>><i> output_first(Req) ->
</I>><i> {ok, Reply} = cowboy_req:chunked_reply(200, [{<<"Content-Type">>,
</I>><i> <<"text/html; charset=utf-8">>},
</I>><i>
</I>><i> {<<"Connection">>, <<"keep-alive">>}], Req),
</I>><i> cowboy_req:chunk(<<"<html><body><script>var _ = function (msg) {
</I>><i> parent.s._(msg, document);
</I>><i> };</script>
</I>><i> ">>,
</I>><i> Reply),
</I>><i> cowboy_req:chunk(gen_output("1::"), Reply).
</I>><i>
</I>><i> gen_output(String) ->
</I>><i> DescList = io_lib:format("<script>_('~s');</script>", [String]),
</I>><i> list_to_binary(DescList).
</I>><i>
</I>><i> terminate(Reason, _Req, _State) ->
</I>><i> NowCount = count_server:bye(),
</I>><i> io:format("offline user ~p :(( ~n", [NowCount]).
</I>><i>
</I>><i>
</I>><i>
</I>><i>
</I>><i> _______________________________________________
</I>><i> Extend mailing list
</I>><i> <A HREF="https://lists.ninenines.eu/listinfo/extend">Extend at lists.ninenines.eu</A>
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