69 lines
6.0 KiB
HTML
69 lines
6.0 KiB
HTML
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<meta name="DC.Title" content="Java event trace performance tools" />
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<meta name="abstract" content="The iSeries Java virtual machine enables the trace of certain Java events." />
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<meta name="description" content="The iSeries Java virtual machine enables the trace of certain Java events." />
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<meta name="DC.Relation" scheme="URI" content="tuning.htm" />
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<meta name="DC.Relation" scheme="URI" content="runtperf.htm" />
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<title>Java event trace performance tools</title>
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</head>
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<body id="evenperf"><a name="evenperf"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Java event trace performance tools</h1>
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<div><p>The iSeries™ Java™ virtual
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machine enables the trace of certain Java events.</p>
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<p>These events can be collected without any instrumentation in the Java code.
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These events include activities, such as garbage collection, thread creation,
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class loading, and locking. The Run Java (RUNJVA) command does not specify these
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events. Instead, you create a Performance Explorer (PEX) definition and use
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the Start Performance Explorer (STRPEX) command to collect the events. Each
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event contains useful performance information, such as time stamp and central
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processing unit (CPU) cycles. You can trace both Java events and other system activities,
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such as disk input and output, with the same trace definition.</p>
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<p>For a complete description of the Java events, see <a href="../books/sc415340.pdf" target="_blank">Performance Tools for iSeries, SC41-5340</a>.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="tuning.htm" title="You should take several aspects of Java application performance into consideration when building a Java application for your iSeries server.">Tune Java program performance with IBM Developer Kit for Java</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="runtperf.htm" title="Understanding the following considerations can help you improve the performance of your Java applications.">Java performance considerations</a></div>
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<div><a href="gc.htm" title="Garbage collection is the process of freeing storage that is used by objects that are no longer referred to by a program. With garbage collection, programmers no longer have to write error prone code to explicitly "free" or "delete" their objects. This code frequently results in "memory leak" program errors. The garbage collector automatically detects an object or group of objects that the user program can no longer reach. It does this because there are no references to that object in any program structure. Once the object has been collected, you can allocate the space for other uses.">Java garbage collection</a></div>
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<div><a href="jnmiperf.htm" title="Native method invocation on an iSeries server may not perform as well as native method invocation on other platforms.">Java Native Method Invocation performance considerations</a></div>
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<div><a href="jmiperf.htm" title="Method inlining can significantly improve method call performance. Any method that is final is a potential candidate for inlining.">Java method inlining performance considerations</a></div>
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<div><a href="excperf.htm" title="The iSeries exception architecture allows versatile interrupt and retry capabilities. It also allows mixed language interaction. Throwing Java exceptions on an iSeries server may be more expensive than on other platforms. This should not affect overall application performance unless Java exceptions are routinely used in the normal application path.">Java exception performance considerations</a></div>
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<div><a href="callperf.htm" title="Java method call traces provide significant performance information about the time that is spent in each Java method.">Java call trace performance tools</a></div>
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<div><a href="profperf.htm" title="System wide central processing unit (CPU) profiling calculates the relative amount of CPU time that is spent in each Java method and all system functions in use by your Java program.">Java profiling performance tools</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="colpdc.htm" title="To collect Java performance data on an iSeries server, follow these steps.">Collect Java performance data</a></div>
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</div>
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</div>
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</body>
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</html>
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