archived-doc-en/reference/info/functions/getrusage.xml

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<refentry xml:id="function.getrusage" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>getrusage</refname>
  <refpurpose>Gets the current resource usages</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>getrusage</methodname>
   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   This is an interface to <command>getrusage(2)</command>. It gets data returned
   from the system call. 
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       If <parameter>mode</parameter> is 1, getrusage will be called with
       <constant>RUSAGE_CHILDREN</constant>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an associative array containing the data returned from the system
   call. All entries are accessible by using their documented field names.
   Returns &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.0.0</entry>
       <entry>
        This function is now supported on Windows.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>getrusage</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$dat = getrusage();
echo $dat["ru_oublock"];       // number of block output operations
echo $dat["ru_inblock"];       // number of block input operations
echo $dat["ru_msgsnd"];        // number of IPC messages sent
echo $dat["ru_msgrcv"];        // number of IPC messages received
echo $dat["ru_maxrss"];        // maximum resident set size
echo $dat["ru_ixrss"];         // integral shared memory size
echo $dat["ru_idrss"];         // integral unshared data size
echo $dat["ru_minflt"];        // number of page reclaims (soft page faults)
echo $dat["ru_majflt"];        // number of page faults (hard page faults)
echo $dat["ru_nsignals"];      // number of signals received
echo $dat["ru_nvcsw"];         // number of voluntary context switches
echo $dat["ru_nivcsw"];        // number of involuntary context switches
echo $dat["ru_nswap"];         // number of swaps
echo $dat["ru_utime.tv_usec"]; // user time used (microseconds)
echo $dat["ru_utime.tv_sec"];  // user time used (seconds)
echo $dat["ru_stime.tv_usec"]; // system time used (microseconds)
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    On Windows <function>getrusage</function> will only return the following 
    members:
   </para>
   <para>
    <simplelist>
     <member><literal>"ru_stime.tv_sec"</literal></member>
     <member><literal>"ru_stime.tv_usec"</literal></member>
     <member><literal>"ru_utime.tv_sec"</literal></member>
     <member><literal>"ru_utime.tv_usec"</literal></member>
     <member>
      <literal>"ru_majflt"</literal> (only if <parameter>mode</parameter> is 
      <constant>RUSAGE_SELF</constant>)
     </member>
     <member>
      <literal>"ru_maxrss"</literal> (only if <parameter>mode</parameter> is 
      <constant>RUSAGE_SELF</constant>)
     </member>
    </simplelist>
   </para>
   <para>
    If <function>getrusage</function> is called with <parameter>mode</parameter> 
    set to <literal>1</literal> (<constant>RUSAGE_CHILDREN</constant>), then 
    resource usage for threads are collected (meaning that internally the function 
    is called with <constant>RUSAGE_THREAD</constant>).
   </para>
  </note>
  <note>
   <para>
    on BeOS 2000, only the following members are returned:
   </para>
   <para>
    <simplelist>
     <member><literal>"ru_stime.tv_sec"</literal></member>
     <member><literal>"ru_stime.tv_usec"</literal></member>
     <member><literal>"ru_utime.tv_sec"</literal></member>
     <member><literal>"ru_utime.tv_usec"</literal></member>
    </simplelist>
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member>Your system's man page on <command>getrusage(2)</command></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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