1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
<meta name="generator" content="Hugo 0.17" />
<title>Nine Nines: Architecture</title>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic' rel='stylesheet' type='text/css'>
<link href="/css/99s.css?r=1" rel="stylesheet">
<link rel="shortcut icon" href="/img/ico/favicon.ico">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="/img/ico/apple-touch-icon-114.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="/img/ico/apple-touch-icon-72.png">
<link rel="apple-touch-icon-precomposed" href="/img/ico/apple-touch-icon-57.png">
</head>
<body class="">
<header id="page-head">
<div id="topbar" class="container">
<div class="row">
<div class="span2">
<h1 id="logo"><a href="/" title="99s">99s</a></h1>
</div>
<div class="span10">
<div id="side-header">
<nav>
<ul>
<li><a title="Hear my thoughts" href="/articles">Articles</a></li>
<li><a title="Watch my talks" href="/talks">Talks</a></li>
<li class="active"><a title="Read the docs" href="/docs">Documentation</a></li>
<li><a title="Request my services" href="/services">Consulting & Training</a></li>
</ul>
</nav>
<ul id="social">
<li>
<a href="https://github.com/ninenines" title="Check my Github repositories"><img src="/img/ico_github.png" data-hover="/img/ico_github_alt.png" alt="Github"></a>
</li>
<li>
<a title="Keep in touch!" href="http://twitter.com/lhoguin"><img src="/img/ico_microblog.png" data-hover="/img/ico_microblog_alt.png"></a>
</li>
<li>
<a title="Contact me" href="mailto:[email protected]"><img src="/img/ico_mail.png" data-hover="/img/ico_mail_alt.png"></a>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
<div id="contents" class="two_col">
<div class="container">
<div class="row">
<div id="docs" class="span9 maincol">
<h1 class="lined-header"><span>Architecture</span></h1>
<div class="paragraph"><p>Cowboy is a lightweight HTTP server.</p></div>
<div class="paragraph"><p>It is built on top of Ranch. Please see the Ranch guide for more
information.</p></div>
<div class="sect1">
<h2 id="_one_process_per_connection">One process per connection</h2>
<div class="sectionbody">
<div class="paragraph"><p>It uses only one process per connection. The process where your
code runs is the process controlling the socket. Using one process
instead of two allows for lower memory usage.</p></div>
<div class="paragraph"><p>Because there can be more than one request per connection with the
keepalive feature of HTTP/1.1, that means the same process will be
used to handle many requests.</p></div>
<div class="paragraph"><p>Because of this, you are expected to make sure your process cleans
up before terminating the handling of the current request. This may
include cleaning up the process dictionary, timers, monitoring and
more.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_binaries">Binaries</h2>
<div class="sectionbody">
<div class="paragraph"><p>It uses binaries. Binaries are more efficient than lists for
representing strings because they take less memory space. Processing
performance can vary depending on the operation. Binaries are known
for generally getting a great boost if the code is compiled natively.
Please see the HiPE documentation for more details.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_date_header">Date header</h2>
<div class="sectionbody">
<div class="paragraph"><p>Because querying for the current date and time can be expensive,
Cowboy generates one <code>Date</code> header value every second, shares it
to all other processes, which then simply copy it in the response.
This allows compliance with HTTP/1.1 with no actual performance loss.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_max_connections">Max connections</h2>
<div class="sectionbody">
<div class="paragraph"><p>By default the maximum number of active connections is set to a
generally accepted big enough number. This is meant to prevent having
too many processes performing potentially heavy work and slowing
everything else down, or taking up all the memory.</p></div>
<div class="paragraph"><p>Disabling this feature, by setting the <code>{max_connections, infinity}</code>
protocol option, would give you greater performance when you are
only processing short-lived requests.</p></div>
</div>
</div>
<nav style="margin:1em 0">
<a style="float:left" href="https://ninenines.eu/docs/en/cowboy/2.0/guide/specs/">
HTTP and other specifications
</a>
<a style="float:right" href="https://ninenines.eu/docs/en/cowboy/2.0/guide/broken_clients/">
Dealing with broken clients
</a>
</nav>
</div>
<div class="span3 sidecol">
<h3>
Cowboy
2.0
User Guide
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.0/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.0/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/cowboy/2.0/guide">2.0</a></li>
<li><a href="/docs/en/cowboy/1.0/guide">1.0</a></li>
</ul>
</div>
</div>
</div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="span6">
<p id="scroll-top"><a href="#">↑ Scroll to top</a></p>
<nav>
<ul>
<li><a href="mailto:[email protected]" title="Contact us">Contact us</a></li><li><a href="https://github.com/ninenines/ninenines.github.io" title="Github repository">Contribute to this site</a></li>
</ul>
</nav>
</div>
<div class="span6 credits">
<p><img src="/img/footer_logo.png"></p>
<p>Copyright © Loïc Hoguin 2012-2016</p>
</div>
</div>
</div>
</footer>
<script src="/js/custom.js"></script>
</body>
</html>
|
