| <?xml version="1.0" encoding="iso-8859-1" ?> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <!--http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd--> |
| <html xmlns="http://www.w3.org/1999/xhtml" |
| > |
| <head><title>Dynamic Actors 2</title> |
| <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> |
| <meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)" /> |
| <meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)" /> |
| <!-- xhtml,3,next,html --> |
| <meta name="src" content="etrice-doc.tex" /> |
| <meta name="date" content="2013-10-21 12:44:00" /> |
| <link rel="stylesheet" type="text/css" href="etrice-doc.css" /> |
| </head><body |
| > |
| <!--l. 129--><div class="crosslinks"><p class="noindent">[<a |
| href="etrice-docse11.html" >next</a>] [<a |
| href="etrice-docse9.html" >prev</a>] [<a |
| href="etrice-docse9.html#tailetrice-docse9.html" >prev-tail</a>] [<a |
| href="#tailetrice-docse10.html">tail</a>] [<a |
| href="etrice-docch3.html#etrice-docse10.html" >up</a>] </p></div> |
| <h3 class="sectionHead"><span class="titlemark">3.2 </span> <a |
| id="x15-670003.2"></a>Dynamic Actors 2</h3> |
| <!--l. 131--><p class="noindent" >This example is contained in <span |
| class="ec-lmtt-10">org.eclipse.etrice.examples.dynamicactors2</span>. |
| </p><!--l. 133--><p class="noindent" > |
| </p> |
| <h4 class="subsectionHead"><span class="titlemark">3.2.1 </span> <a |
| id="x15-680003.2.1"></a>Purpose</h4> |
| <!--l. 135--><p class="noindent" >A modified version of <span |
| class="ec-lmtt-10">dynamicactors1 </span>is used to analyze eventual memory leaks of the application. |
| </p><!--l. 137--><p class="noindent" > |
| </p> |
| <h4 class="subsectionHead"><span class="titlemark">3.2.2 </span> <a |
| id="x15-690003.2.2"></a>Details</h4> |
| <!--l. 139--><p class="noindent" >In this modified version creation and deletion of optional actors is looped. Each loop consists of 4 steps: |
| </p><!--l. 142--><p class="noindent" > |
| </p><ol class="enumerate1" > |
| <li |
| class="enumerate" id="x15-69002x1">create an instance of <span |
| class="ec-lmtt-10">Optional2</span> |
| </li> |
| <li |
| class="enumerate" id="x15-69004x2">destroy the instance |
| </li> |
| <li |
| class="enumerate" id="x15-69006x3">create an instance of <span |
| class="ec-lmtt-10">Optional1</span> |
| </li> |
| <li |
| class="enumerate" id="x15-69008x4">destroy the instance</li></ol> |
| <!--l. 149--><p class="noindent" >All together 600 steps are performed which corresponds to 300 creations and deletions. |
| </p><!--l. 151--><p class="noindent" >The free memory is printed to the console. Also the overall execution time is measured. After the loop is finished the heap is |
| analyzed using <span |
| class="ec-lmtt-10">JConsole </span>(which is a part of the Java6 distribution) to dump the heap and <a |
| href="http://www.eclipse.org/mat/" ><span |
| class="ec-lmtt-10">org.eclipse.mat</span></a> to analyze |
| it. |
| </p><!--l. 156--><p class="noindent" >The measured total execution time on a Intel Core 2 Duo at 2.66 GHz was 110 ms. This corresponds to about 370 |
| <span |
| class="lmmi-10">μ</span>s. |
| </p><!--l. 159--><p class="noindent" >The result of the heap analysis for <span |
| class="ec-lmtt-10">org.eclipse.etrice.* </span>objects is listed in figure <a |
| href="#x15-690092">3.2<!--tex4ht:ref: fig:dynact2_heap --></a>. The small numbers per object and |
| the retained heap size indicate that the application has no memory leak. |
| </p> |
| <hr class="figure" /><div class="figure" |
| > |
| |
| |
| <a |
| id="x15-690092"></a> |
| |
| |
| <!--l. 163--><p class="noindent" ><img |
| src="images/039-DynAct2-HeapAnalysis.jpg" alt="PIC" |
| /> |
| <br /> </p><div class="caption" |
| ><span class="id">Figure 3.2: </span><span |
| class="content">Heap analysis after 600 steps</span></div><!--tex4ht:label?: x15-690092 --> |
| |
| |
| </div><hr class="endfigure" /> |
| <h4 class="subsectionHead"><span class="titlemark">3.2.3 </span> <a |
| id="x15-700003.2.3"></a>Noteworthy</h4> |
| <ul class="itemize1"> |
| <li class="itemize">Calling the garbage collector every time before the free memory is dumped costs a significant amount of time |
| and the execution time is increased to the order of seconds. |
| </li> |
| <li class="itemize">The measured free memory is close to constant. Only a small step is observed which wasn’t analyzed further.</li></ul> |
| |
| |
| <!--l. 176--><div class="crosslinks"><p class="noindent">[<a |
| href="etrice-docse11.html" >next</a>] [<a |
| href="etrice-docse9.html" >prev</a>] [<a |
| href="etrice-docse9.html#tailetrice-docse9.html" >prev-tail</a>] [<a |
| href="etrice-docse10.html" >front</a>] [<a |
| href="etrice-docch3.html#etrice-docse10.html" >up</a>] </p></div> |
| <!--l. 176--><p class="noindent" ><a |
| id="tailetrice-docse10.html"></a> </p> |
| </body></html> |
