git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/memcached_stats.html

   1
   2
   3 <!DOCTYPE html>
   4 <!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
   5 <!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
   6 <head>
   7   <meta charset="utf-8">
   8
   9   <meta name="viewport" content="width=device-width, initial-scale=1.0">
  10
  11   <title>Working with statistical information from a server &mdash; libmemcached 1.0.99 documentation</title>
  12
  13
  14
  15
  16
  17
  18
  19
  20   <script type="text/javascript" src="../_static/js/modernizr.min.js"></script>
  21
  22
  23       <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
  24         <script src="../_static/jquery.js"></script>
  25         <script src="../_static/underscore.js"></script>
  26         <script src="../_static/doctools.js"></script>
  27         <script src="../_static/language_data.js"></script>
  28
  29     <script type="text/javascript" src="../_static/js/theme.js"></script>
  30
  31
  32
  33
  34   <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
  35   <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
  36     <link rel="index" title="Index" href="../genindex.html" />
  37     <link rel="search" title="Search" href="../search.html" />
  38     <link rel="copyright" title="Copyright" href="../copyright.html" />
  39     <link rel="next" title="Deprecated Functionality" href="index_deprecated.html" />
  40     <link rel="prev" title="Analyzing servers" href="memcached_analyze.html" />
  41 </head>
  42
  43 <body class="wy-body-for-nav">
  44
  45
  46   <div class="wy-grid-for-nav">
  47
  48     <nav data-toggle="wy-nav-shift" class="wy-nav-side">
  49       <div class="wy-side-scroll">
  50         <div class="wy-side-nav-search" >
  51
  52
  53
  54             <a href="../index.html" class="icon icon-home"> libmemcached
  55
  56
  57
  58           </a>
  59
  60
  61
  62
  63               <div class="version">
  64                 1.0
  65               </div>
  66
  67
  68
  69
  70 <div role="search">
  71   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
  72     <input type="text" name="q" placeholder="Search docs" />
  73     <input type="hidden" name="check_keywords" value="yes" />
  74     <input type="hidden" name="area" value="default" />
  75   </form>
  76 </div>
  77
  78
  79         </div>
  80
  81         <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
  82
  83
  84
  85
  86
  87
  88               <p class="caption"><span class="caption-text">libmemcached</span></p>
  89 <ul class="current">
  90 <li class="toctree-l1"><a class="reference internal" href="../libmemcached.html">Introduction</a></li>
  91 <li class="toctree-l1 current"><a class="reference internal" href="index.html">libmemcached API</a><ul class="current">
  92 <li class="toctree-l2"><a class="reference internal" href="index_basics.html">Basics</a></li>
  93 <li class="toctree-l2"><a class="reference internal" href="index_data.html">Working with Data</a></li>
  94 <li class="toctree-l2"><a class="reference internal" href="index_errors.html">Messages and Errors</a></li>
  95 <li class="toctree-l2 current"><a class="reference internal" href="index_advanced.html">Advanced Topics</a></li>
  96 <li class="toctree-l2"><a class="reference internal" href="index_deprecated.html">Deprecated Functionality</a></li>
  97 </ul>
  98 </li>
  99 <li class="toctree-l1"><a class="reference internal" href="index_misc.html">Misc</a><ul>
 100 <li class="toctree-l2"><a class="reference internal" href="configuration.html">Configuration</a></li>
 101 <li class="toctree-l2"><a class="reference internal" href="constants.html">Constants</a></li>
 102 <li class="toctree-l2"><a class="reference internal" href="examples.html">Examples</a></li>
 103 <li class="toctree-l2"><a class="reference internal" href="versioning.html">Versioning</a></li>
 104 </ul>
 105 </li>
 106 </ul>
 107 <p class="caption"><span class="caption-text">libmemcachedutil</span></p>
 108 <ul>
 109 <li class="toctree-l1"><a class="reference internal" href="../libmemcachedutil.html">Introduction</a></li>
 110 <li class="toctree-l1"><a class="reference internal" href="../libmemcachedutil/index.html">libmemcachedutil API</a><ul>
 111 <li class="toctree-l2"><a class="reference internal" href="../libmemcachedutil/memcached_pool.html">Working with memcached pools</a></li>
 112 </ul>
 113 </li>
 114 </ul>
 115 <p class="caption"><span class="caption-text">libhashkit</span></p>
 116 <ul>
 117 <li class="toctree-l1"><a class="reference internal" href="../libhashkit.html">Introduction</a></li>
 118 <li class="toctree-l1"><a class="reference internal" href="../libhashkit/index.html">libhashkit API</a><ul>
 119 <li class="toctree-l2"><a class="reference internal" href="../libhashkit/hashkit_create.html">Creating a hashkit structure</a></li>
 120 <li class="toctree-l2"><a class="reference internal" href="../libhashkit/hashkit_function.html">Set Hash Function</a></li>
 121 <li class="toctree-l2"><a class="reference internal" href="../libhashkit/hashkit_functions.html">Available Hashes</a></li>
 122 <li class="toctree-l2"><a class="reference internal" href="../libhashkit/hashkit_value.html">Generate hash value</a></li>
 123 </ul>
 124 </li>
 125 </ul>
 126 <p class="caption"><span class="caption-text">Client Applications</span></p>
 127 <ul>
 128 <li class="toctree-l1"><a class="reference internal" href="../bin/index.html">Client Applications</a><ul>
 129 <li class="toctree-l2"><a class="reference internal" href="../bin/memcapable.html">memcapable - Checking a Memcached server capabilities and compatibility</a></li>
 130 <li class="toctree-l2"><a class="reference internal" href="../bin/memcat.html">memcat - “cat” data from a server</a></li>
 131 <li class="toctree-l2"><a class="reference internal" href="../bin/memcp.html">memcp - Copy data to a server</a></li>
 132 <li class="toctree-l2"><a class="reference internal" href="../bin/memdump.html">memdump - Dumping your server</a></li>
 133 <li class="toctree-l2"><a class="reference internal" href="../bin/memerror.html">memerror - translate an error code to a string</a></li>
 134 <li class="toctree-l2"><a class="reference internal" href="../bin/memflush.html">memflush - flush all data from a server</a></li>
 135 <li class="toctree-l2"><a class="reference internal" href="../bin/memrm.html">memrm - Remove data from a server</a></li>
 136 <li class="toctree-l2"><a class="reference internal" href="../bin/memslap.html">memslap - Load testing  and benchmarking a server</a></li>
 137 <li class="toctree-l2"><a class="reference internal" href="../bin/memaslap.html">memaslap - Load testing  and benchmarking a server</a></li>
 138 <li class="toctree-l2"><a class="reference internal" href="../bin/memstat.html">memstat - Gather statistics from a server</a></li>
 139 <li class="toctree-l2"><a class="reference internal" href="../bin/memexist.html">memexist - Check for the existence of a key</a></li>
 140 <li class="toctree-l2"><a class="reference internal" href="../bin/memparse.html">memparse - Parse an option string</a></li>
 141 <li class="toctree-l2"><a class="reference internal" href="../bin/memping.html">memping - Test to see if a server is available.</a></li>
 142 <li class="toctree-l2"><a class="reference internal" href="../bin/memtouch.html">memtouch - Touches a key.</a></li>
 143 </ul>
 144 </li>
 145 </ul>
 146
 147
 148
 149         </div>
 150       </div>
 151     </nav>
 152
 153     <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
 154
 155
 156       <nav class="wy-nav-top" aria-label="top navigation">
 157
 158           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
 159           <a href="../index.html">libmemcached</a>
 160
 161       </nav>
 162
 163
 164       <div class="wy-nav-content">
 165
 166         <div class="rst-content">
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184 <div role="navigation" aria-label="breadcrumbs navigation">
 185
 186   <ul class="wy-breadcrumbs">
 187
 188       <li><a href="../index.html">Docs</a> &raquo;</li>
 189
 190           <li><a href="index.html">libmemcached API</a> &raquo;</li>
 191
 192           <li><a href="index_advanced.html">Advanced Topics</a> &raquo;</li>
 193
 194           <li><a href="index_advanced_stats.html">Statistics</a> &raquo;</li>
 195
 196       <li>Working with statistical information from a server</li>
 197
 198
 199       <li class="wy-breadcrumbs-aside">
 200
 201
 202
 203       </li>
 204
 205   </ul>
 206
 207
 208   <hr/>
 209 </div>
 210           <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
 211            <div itemprop="articleBody">
 212
 213   <div class="section" id="working-with-statistical-information-from-a-server">
 214 <h1>Working with statistical information from a server<a class="headerlink" href="#working-with-statistical-information-from-a-server" title="Permalink to this headline">¶</a></h1>
 215 <p>Get memcached statistics</p>
 216 <div class="section" id="synopsis">
 217 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 218 <p>#include &lt;libmemcached/memcached.h&gt;</p>
 219 <dl class="type">
 220 <dt id="_CPPv417memcached_stat_st">
 221 <span id="_CPPv317memcached_stat_st"></span><span id="_CPPv217memcached_stat_st"></span><span id="memcached_stat_st"></span><em class="property">type </em><code class="sig-name descname">memcached_stat_st</code><a class="headerlink" href="#_CPPv417memcached_stat_st" title="Permalink to this definition">¶</a><br /></dt>
 222 <dd></dd></dl>
 223
 224 <dl class="type">
 225 <dt id="_CPPv417memcached_stat_fn">
 226 <span id="_CPPv317memcached_stat_fn"></span><span id="_CPPv217memcached_stat_fn"></span><span id="memcached_stat_fn"></span><em class="property">typedef </em><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> (*<code class="sig-name descname">memcached_stat_fn</code>)<span class="sig-paren">(</span><em class="property">const</em> memcached_instance_st *server, <em class="property">const</em> char *key, size_t key_length, <em class="property">const</em> char *value, size_t value_length, void *context<span class="sig-paren">)</span><a class="headerlink" href="#_CPPv417memcached_stat_fn" title="Permalink to this definition">¶</a><br /></dt>
 227 <dd></dd></dl>
 228
 229 <dl class="function">
 230 <dt id="_CPPv414memcached_statP12memcached_stPcP18memcached_return_t">
 231 <span id="_CPPv314memcached_statP12memcached_stPcP18memcached_return_t"></span><span id="_CPPv214memcached_statP12memcached_stPcP18memcached_return_t"></span><span id="memcached_stat__memcached_stP.cP.memcached_return_tP"></span><a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<code class="sig-name descname">memcached_stat</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, char *<em>args</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv414memcached_statP12memcached_stPcP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 232 <dd></dd></dl>
 233
 234 <dl class="function">
 235 <dt id="_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t">
 236 <span id="_CPPv325memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t"></span><span id="_CPPv225memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t"></span><span id="memcached_stat_servername__memcached_stat_stP.cP.cCP.in_port_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_stat_servername</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, char *<em>args</em>, <em class="property">const</em> char *<em>hostname</em>, in_port_t <em>port</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t" title="Permalink to this definition">¶</a><br /></dt>
 237 <dd></dd></dl>
 238
 239 <dl class="function">
 240 <dt id="_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t">
 241 <span id="_CPPv324memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t"></span><span id="_CPPv224memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t"></span><span id="memcached_stat_get_value__memcached_stP.memcached_stat_stP.cCP.memcached_return_tP"></span>char *<code class="sig-name descname">memcached_stat_get_value</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, <em class="property">const</em> char *<em>key</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 242 <dd></dd></dl>
 243
 244 <dl class="function">
 245 <dt id="_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t">
 246 <span id="_CPPv323memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t"></span><span id="_CPPv223memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t"></span><span id="memcached_stat_get_keys__memcached_stP.memcached_stat_stP.memcached_return_tP"></span>char **<code class="sig-name descname">memcached_stat_get_keys</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 247 <dd></dd></dl>
 248
 249 <dl class="function">
 250 <dt id="_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv">
 251 <span id="_CPPv322memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv"></span><span id="_CPPv222memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv"></span><span id="memcached_stat_execute__memcached_stP.cCP.memcached_stat_fn.voidP"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_stat_execute</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>memc</em>, <em class="property">const</em> char *<em>args</em>, <a class="reference internal" href="#_CPPv417memcached_stat_fn" title="memcached_stat_fn">memcached_stat_fn</a> <em>func</em>, void *<em>context</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv" title="Permalink to this definition">¶</a><br /></dt>
 252 <dd></dd></dl>
 253
 254 <p>Compile and link with -lmemcached</p>
 255 </div>
 256 <div class="section" id="description">
 257 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 258 <p>libmemcached(3) has the ability to query a memcached server (or collection
 259 of servers) for their current state. Queries to find state return a
 260 <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> structure. You are responsible for freeing this structure. While it is possible to access the structure directly it is not advisable. <a class="reference internal" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="memcached_stat_get_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_value()</span></code></a> has been provided to query the structure.</p>
 261 <p><a class="reference internal" href="#_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv" title="memcached_stat_execute"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_execute()</span></code></a> uses the servers found in <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> and executes a “stat” command on each server. args is an optional argument that can be passed in to modify the behavior of “stats”. You will need to supply a callback function that will be supplied each pair of values returned by
 262 the memcached server.</p>
 263 <p><a class="reference internal" href="#_CPPv414memcached_statP12memcached_stPcP18memcached_return_t" title="memcached_stat"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat()</span></code></a> fetches an array of <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> structures containing the state of all available memcached servers. The return value must be freed by the calling application. If called with the <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE" title="MEMCACHED_BEHAVIOR_USE_UDP"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_USE_UDP</span></code></a> behavior set, a NULL value is returned and the error parameter is set to <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE" title="MEMCACHED_NOT_SUPPORTED"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOT_SUPPORTED</span></code></a>.</p>
 264 <p><a class="reference internal" href="#_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t" title="memcached_stat_servername"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_servername()</span></code></a> can be used standalone without a <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_st</span></code></a> to obtain the state of a particular server.  “args” is used to define a particular state object (a list of these are not provided for by either
 265 the <a class="reference internal" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="memcached_stat_get_keys"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_keys()</span></code></a> call nor are they defined in the memcached protocol). You must specify the hostname and port of the server you want to
 266 obtain information on.</p>
 267 <p><a class="reference internal" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="memcached_stat_get_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_value()</span></code></a> returns the value of a particular state key. You specify the key you wish to obtain.  The key must be null terminated.</p>
 268 <p><a class="reference internal" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="memcached_stat_get_keys"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_keys()</span></code></a> returns a list of keys that the server has state objects on. You are responsible for freeing this list.</p>
 269 <p>A command line tool, memstat(1), is provided so that you do not have to write
 270 an application to do this.</p>
 271 </div>
 272 <div class="section" id="return">
 273 <h2>RETURN<a class="headerlink" href="#return" title="Permalink to this headline">¶</a></h2>
 274 <p>Varies, see particular functions.</p>
 275 <p>Any method returning a <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> expects you to free the
 276 memory allocated for it.</p>
 277 </div>
 278 <div class="section" id="see-also">
 279 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 280 </div>
 281 </div>
 282
 283
 284            </div>
 285
 286           </div>
 287           <footer>
 288
 289     <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
 290
 291         <a href="index_deprecated.html" class="btn btn-neutral float-right" title="Deprecated Functionality" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a>
 292
 293
 294         <a href="memcached_analyze.html" class="btn btn-neutral float-left" title="Analyzing servers" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a>
 295
 296     </div>
 297
 298
 299   <hr/>
 300
 301   <div role="contentinfo">
 302     <p>
 303         &copy; <a href="../copyright.html">Copyright</a>
 304
 305     </p>
 306   </div>
 307   Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/rtfd/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
 308
 309 </footer>
 310
 311         </div>
 312       </div>
 313
 314     </section>
 315
 316   </div>
 317
 318
 319
 320   <script type="text/javascript">
 321       jQuery(function () {
 322           SphinxRtdTheme.Navigation.enable(true);
 323       });
 324   </script>
 325
 326
 327
 328
 329
 330
 331 </body>
 332 </html>