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<H1>[99s-extend] cowboy how to ruduce the memory usage per long-hold connection</H1>
<B>yongboy</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20cowboy%20how%20to%20ruduce%20the%20memory%20usage%20per%20long-hold%0A%09connection&In-Reply-To=%3CCAN_mQBobPN0zdpqJ3WtGKJaRMNiutvurgJfncMCqM3qtUHTm1g%40mail.gmail.com%3E"
TITLE="[99s-extend] cowboy how to ruduce the memory usage per long-hold connection">yongboy at gmail.com
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<I>Fri Apr 26 08:11:56 CEST 2013</I>
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<PRE>I have tested one long-hold webapp, when 512000 user connected, the app
used
6801M memory, 6801M*1024K / 512000 = 13.6K/Connection.
Does anyone give me some advice on how to reduce the memory usage per one
connection, thanks very much !
Here is the code snippet:
start(_Type, _Args) ->
Dispatch = cowboy_router:compile([
{'_', [{'_', htmlfile_handler, []}]}
]),
cowboy:start_http(my_http_listener, 100,
[{port, 8000}, {max_connections, infinity}],
[{env, [{dispatch, Dispatch}]}]
),
count_server:start(),
htmlfilesimple_sup:start_link().
......
-module(htmlfile_handler).
-behaviour(cowboy_loop_handler).
-export([init/3, info/3, terminate/3]).
-define(HEARBEAT_TIMEOUT, 20*1000).
-record(status, {count=0}).
init(_Any, Req, State) ->
NowCount = count_server:welcome(),
io:format("online user ~p :))~n", [NowCount]),
output_first(Req),
Req2 = cowboy_req:compact(Req),
{loop, Req2, State, hibernate}.
%% POST/Short Request
info(_Any, Req, State) ->
{loop, Req, State, hibernate}.
output_first(Req) ->
{ok, Reply} = cowboy_req:chunked_reply(200, [{<<"Content-Type">>,
<<"text/html; charset=utf-8">>},
{<<"Connection">>, <<"keep-alive">>}], Req),
cowboy_req:chunk(<<"<html><body><script>var _ = function (msg) {
parent.s._(msg, document);
};</script>
">>,
Reply),
cowboy_req:chunk(gen_output("1::"), Reply).
gen_output(String) ->
DescList = io_lib:format("<script>_('~s');</script>", [String]),
list_to_binary(DescList).
terminate(Reason, _Req, _State) ->
NowCount = count_server:bye(),
io:format("offline user ~p :(( ~n", [NowCount]).
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