<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
JBoss 6.1.0.Final SFSB concurrency issue
</h3>
<span style="margin-bottom: 10px;">
created by <a href="https://community.jboss.org/people/PopOctavian">Octavian Pop</a> in <i>EJB3</i> - <a href="https://community.jboss.org/message/828891#828891">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am trying to run a test to investigate a performace issue after upgrading from JBoss 4.0.5 to 6.1. For this I use a simple test application with a service which starts threads, each thread looks-up a SFSB instace and execute a method to increment a number. </p><p>From this test I notticed that SFSB method calls in the multi-threaded test are serialized - one execution after the other. Investigating in more detail I found that this serialization is caused by CMC interceptor from server/current/deploy/ejb3-interceptors-aop.xml.</p><p>If I commented out CMC, performance increased significantly.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Is this a known behavior?</p><p>What are the implications if I comment CMC?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Below are code snippets from test:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Service
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> TestingService
<font color="navy">{</font>
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>int</b></font> numberOfThreads=2;
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> start() <font color="navy"><b>throws</b></font> Exception
    <font color="navy">{</font>
 
        startTest(numberOfThreads);
    <font color="navy">}</font>
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> startTest(<font color="navy"><b>int</b></font> threadNumber) <font color="navy"><b>throws</b></font> InterruptedException
    <font color="navy">{</font>
        Thread [] threads = <font color="navy"><b>new</b></font> Thread[threadNumber];
 
        <font color="navy"><b>for</b></font> (<font color="navy"><b>int</b></font> i=0;i< threadNumber;i++)
        <font color="navy">{</font>
            Thread t = <font color="navy"><b>new</b></font> Thread()
            <font color="navy">{</font>
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> run()
                <font color="navy">{</font>
                    Client testClient = <font color="navy"><b>new</b></font> Client();
                    testClient.processNumber(Math.round(Math.random()*1000));
                    testClient.destroy();
                <font color="navy">}</font>
            <font color="navy">}</font>;
            t.start();
            threads[i] = t;
        <font color="navy">}</font>
 
        <font color="navy"><b>for</b></font>(<font color="navy"><b>int</b></font> i=0; i<threadNumber; i++)
        <font color="navy">{</font>
            threads[i].join();
        <font color="navy">}</font>
    <font color="navy">}</font>
<font color="navy">}</font>
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> Client
<font color="navy">{</font>
    IGenericSFB genericSFB;
 
    <font color="navy"><b>public</b></font> Client()
    <font color="navy">{</font>
        genericSFB = (IGenericSFB) ServiceLocator.getLocalService(GenericSFB.class.getSimpleName());
        System.out.println(<font color="red">"This address "</font> + genericSFB + <font color="red">" "</font> + genericSFB.hashCode());
    <font color="navy">}</font>
 
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> processNumber(Long number)
    <font color="navy">{</font>
        System.out.println(<font color="red">"Client - Start incrementing "</font> + number);
        genericSFB.incrementNumber(number);
        System.out.println(<font color="red">"Client - Finish incrementing "</font> + number);
 
    <font color="navy">}</font>
...
 
 
@Stateful
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> GenericSFB <font color="navy"><b>implements</b></font> IGenericSFB, Serializable
<font color="navy">{</font>
    <font color="navy"><b>private</b></font> <font color="navy"><b>int</b></font> number;
    <font color="navy"><b>private</b></font> String stuff;
    <font color="navy"><b>private</b></font> String someOtherStuff;
 
    <font color="navy"><b>public</b></font> Long incrementNumber(Long number)
    <font color="navy">{</font>
        System.out.println(<font color="red">"SFB - start incrementing number "</font> + number + <font color="red">" by "</font> + <font color="navy"><b>this</b></font>);
        <font color="navy"><b>try</b></font>
        <font color="navy">{</font>
            Thread.currentThread().sleep(10000);
        <font color="navy">}</font>
        <font color="navy"><b>catch</b></font> (InterruptedException e)<font color="navy">{</font><font color="navy">}</font>
 
        System.out.println(<font color="red">"SFB - finish incrementing number "</font> + number);
 
        <font color="navy"><b>return</b></font> 0L;
    <font color="navy">}</font>
...
 
 
</code></pre></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/828891#828891">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in EJB3 at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2029">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>