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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@301112 c90b9560-bf6c-de11-be94-00142212c4b1
106 lines
3.2 KiB
XML
106 lines
3.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<appendix xml:id="apd.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="apd.examples.usage">
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<title>How to use PHP-APD in your scripts</title>
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<procedure>
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<step>
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<para>
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As the first line of your PHP script, call the apd_set_pprof_trace() function
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to start the trace:
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</para>
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<para>
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<programlisting role="php">
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<![CDATA[
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<?php
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apd_set_pprof_trace();
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?>
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]]>
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</programlisting>
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</para>
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<para>
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You can insert the line anywhere in your script, but if you do not start
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tracing at the beginning of your script you discard profile data that might
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otherwise lead you to a performance bottleneck.
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</para>
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</step>
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<step>
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<para>
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Now run your script. The dump output will be written to
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<filename>apd.dumpdir/pprof_pid.ext</filename>.
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<tip>
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<para>
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If you're running the CGI version of PHP, you will need to add the '-e'
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flag to enable extended information for apd to work properly. For
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example:
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<userinput>php -e -f script.php</userinput>
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</para>
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</tip>
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</para>
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</step>
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<step>
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<para>
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To display formatted profile data, issue the <command>pprofp</command>
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command with the sort and display options of your choice. The formatted
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output will look something like:
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<screen>
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<![CDATA[
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bash-2.05b$ pprofp -R /tmp/pprof.22141.0
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Trace for /home/dan/testapd.php
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Total Elapsed Time = 0.00
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Total System Time = 0.00
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Total User Time = 0.00
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Real User System secs/ cumm
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%Time (excl/cumm) (excl/cumm) (excl/cumm) Calls call s/call Memory Usage Name
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--------------------------------------------------------------------------------------
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100.0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.0000 0.0009 0 main
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56.9 0.00 0.00 0.00 0.00 0.00 0.00 1 0.0005 0.0005 0 apd_set_pprof_trace
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28.0 0.00 0.00 0.00 0.00 0.00 0.00 10 0.0000 0.0000 0 preg_replace
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14.3 0.00 0.00 0.00 0.00 0.00 0.00 10 0.0000 0.0000 0 str_replace
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]]>
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</screen>
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</para>
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<para>
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The -R option used in this example sorts the profile table by the amount
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of real time the script spent executing a given function. The "cumm call"
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column reveals how many times each function was called, and the "s/call"
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column reveals how many seconds each call to the function required, on
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average.
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</para>
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</step>
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<step>
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<para>
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To generate a calltree file that you can import into the KCacheGrind
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profile analysis application, issue the <command>pprof2calltree</command>
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comand.
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</para>
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</step>
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</procedure>
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</section>
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</appendix>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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