<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="2" MadCap:lastHeight="120" MadCap:lastWidth="624" MadCap:disableMasterStylesheet="true" MadCap:tocPath="" MadCap:InPreviewMode="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="index.xml" MadCap:SearchType="Stem">
<head><title>Using Your Application To Generate The IO Pattern </title>
<script type="text/javascript">/* <![CDATA[ */
window.onload = function(){
var pathToFlash = $('html').attr('MadCap:PathToHelpSystem') + 'Content/Resources/Code/ZeroClipboard.swf';
ZeroClipboard.setMoviePath(pathToFlash);
function bindToClipBord(element,content){
var clip = new ZeroClipboard.Client();
clip.setText(content);
clip.glue(element);
};
if(location.protocol==='file:'){
$('.copylink-marker').remove();
} else{
$('.copylink-marker').each(function(){
var text = $(this).parent().parent().children('.prettyprint').html();
$(this).hover(function(){
bindToClipBord(this,text);
},
function(){});
});
}
prettyPrint();
};
/* ]]> */</script>
<link href="../../SkinSupport/MadCap.css" rel="stylesheet" />
<link href="../../Resources/Stylesheets/OnlineStyle.css" rel="stylesheet" />
<script src="../../Resources/Code/prettify.js">
</script>
<script src="../../Resources/Code/lang-vb.js">
</script>
<script src="../../Resources/Code/jquery.min.js">
</script>
<script src="../../Resources/Code/ZeroClipboard.js">
</script>
<script src="../../SkinSupport/MadCapAll.js" type="text/javascript">
</script>
</head>
<body>
<p class="MCWebHelpFramesetLink" style="display: none;"><a href="../../../index_CSH.html#tuning/io_benchmark_tools/using_your_application_to_generate_the_io_pattern.htm" style="">Open topic with navigation</a>
</p>
<p>
<script type="text/javascript">/*<![CDATA[*/document.write('<a href="' + location.href +'">');
document.write("Direct Link");
document.write('</a>');/*]]>*/</script>
</p>
<p>
</p>
<h1>Using Your Application To Generate The IO Pattern</h1>When you execute IoBenchmark, it uses a simple CRUD (create, read,
update, delete) application as the target application. This application
is located in the com.db4o.bench.crud package. If you want to use your own application for generating the I/O access patterns, here's what you have to do:
<ul><li value="1">Use a LoggingIoAdapter, delegating to your default IoAdapter: <code><br />RandomAccessFileAdapter rafAdapter = <br />new RandomAccessFileAdapter(); <br />IoAdapter ioAdapter = <br />new LoggingIoAdapter(rafAdapter, "filename.log"); <br />Configuration config = Db4o.cloneConfiguration(); <br />config.io(ioAdapter);</code> <![CDATA[ ]]><br />
You'll also find this code in <code><br />com.db4o.bench.crud.CrudApplication#prepare()</code>.<br /></li><li value="2">Change IoBenchmark to call your application by modifying the <code><br />runTargetApplication()</code> method. You also have to exchange the calls to <br /><code>CrudApplication.logFileName(itemCount)</code> in <code>prepareDbFile()</code> and <code>runBenchmark</code> with the file name of the log containing the I/O access pattern of your application. Using the code from above, this log file will be called "filename.log".
</li></ul>If you want to generate your log by interacting with your application, rather than having IoBenchmark calling it, do as follows: <ul><li value="1">Use a LoggingIoAdapter in your application</li><li value="2">Interact with your application to create the log</li><li value="3">Remove the stage 1 from IoBenchmark and make it start in stage 2 with your log.</li></ul>If you are using your own application to generate the I/O log file, check out the <a href="io_log_file_statistics.htm">IO Log File Statistics</a> section further down.
<script type="text/javascript" src="../../SkinSupport/MadCapBodyEnd.js"></script></body>
</html>
