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| <meta name="abstract" content="There is no exact algorithm for memory analysis. The following table divides existing heap dump queries by the usage categories."/> |
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| <title>Query Matrix</title> |
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| |
| <h1 class="title topictitle1">Query Matrix</h1> |
| |
| |
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| |
| <div class="body refbody"><p class="shortdesc"> |
| There is no exact algorithm for memory analysis. The following |
| table divides existing heap dump queries by the usage |
| categories. |
| </p> |
| |
| <div class="section"><h2 class="title sectiontitle">Overview</h2> |
| |
| |
| <table cellpadding="4" cellspacing="0" summary="" id="ref_querymatrix__querymatrixoverview" border="1" class="simpletable"><tr class="strow"> |
| <td valign="top" class="stentry" width="40%">Histogram</td> |
| |
| <td valign="top" class="stentry" width="60%"> |
| Class histogram is a list of all the objects in |
| the heap dump. You see the number of objects, |
| shallow and retained sizes for every class. The |
| sorting order of the list can be changed by |
| clicking the column header. Histogram gives you |
| a good starting point for further analysis. |
| Histogram can be opened by pressing the toolbar |
| button |
| <img class="image" src="../mimes/i-histogram.png"/> |
| or by activating the action link on the Overview |
| pane. |
| </td> |
| |
| </tr> |
| <tr class="strow"> |
| <td valign="top" class="stentry">Top Consumers</td> |
| |
| <td valign="top" class="stentry"> |
| Top Consumers query returns information about |
| the biggest objects grouped by class, class |
| loader, and package as HTML page. The total heap |
| is included in the analysis. |
| </td> |
| |
| </tr> |
| <tr class="strow"> |
| <td valign="top" class="stentry">Heap Dump Overview</td> |
| |
| <td valign="top" class="stentry"> |
| <p class="p"> |
| When a heap dump is opened the Overview |
| editor already provides a first analysis on |
| the heap dump: |
| </p> |
| |
| <ul class="ul"> |
| <li class="li"> |
| Check the size of the heap dump, how |
| many object, classes, class loaders it |
| has. |
| </li> |
| |
| <li class="li">Look at the biggest objects.</li> |
| |
| </ul> |
| |
| <p class="p"> |
| The Heap Dump Overview report can be opened |
| via the toolbar: |
| </p> |
| |
| <img class="image" src="../mimes/6f9c3893.png"/> |
| <p class="p">Overview report contains a histogram and a top consumers overview.</p> |
| |
| </td> |
| |
| </tr> |
| </table> |
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| |
| </div> |
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| <div class="related-links"> |
| <ul class="ullinks"> |
| <li class="link ulchildlink"><strong><a href="../reference/findingmemoryleak.html">Finding Memory Leak</a></strong><br/> |
| </li> |
| <li class="link ulchildlink"><strong><a href="../reference/analyzingmemoryconsumption.html">Analyzing Memory Consumption</a></strong><br/> |
| </li> |
| </ul> |
| </div> |
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