| author | Matti Laitinen <matti.t.laitinen@nokia.com> |
| Wed, 21 Apr 2010 20:01:08 +0300 | |
| changeset 7 | 8e12a575a9b5 |
| permissions | -rw-r--r-- |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<html> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<head> |
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MemSpy Carbide Extension 1.6.0
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<title>Isolation and Pervasiveness</title> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<link href="../../book.css" type="text/css" rel="stylesheet"> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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</head> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<body> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<h2>Isolation and Pervasiveness</h2> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<p>The Isolation and Pervasiveness views are about highlighting reference |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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density.</p> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<p>The <strong>Isolation</strong> view shades objects from cold (blue) to hot |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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(more red) based on how “popular” they are with other objects. The |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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actual incoming reference count is also displayed in the box at the start of |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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each object. Darkest blue objects with a red zero count indicate objects that |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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have no references at all within the heap itself. That does not necessarily |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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mean they are orphans that have been leaked; they could be referenced from the |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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stack or from static variables instead. However, if you do think you may have a |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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memory leak then these zero count objects are a good place to start looking.</p> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<p><img src="../images/ha_heap_view_isolation.png"></p> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<p>The <strong>Pervasiveness</strong> view is the inverse of the Isolation |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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view. In Pervasiveness view, objects are shaded from cold (blue) to hot (more |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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red) based on how many other objects they are “interested” in. The |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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actual outgoing reference count is also displayed in the box at the start of |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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the object. The other highlighted boxes within cells are the actual locations |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
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of the potential outgoing references Heap Analyser has identified. As pure data |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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datatypes with no outgoing references, descriptors are distinguished in yellow |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
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here. If you have a memory leak, bright red objects may be worth investigating |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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as the potential home to an abnormally large number of references. For example, |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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the buffer object within a large array of pointers may be highlighted in this |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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view, and in some cases could be the source of a leak e.g. due to forgetting to |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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delete objects from the array when they’re no longer needed.</p> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<p><img src="../images/ha_heap_view_pervasiveness.png"></p> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<h5>Related references</h5> |
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8e12a575a9b5
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Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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<ul> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
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<li><a href="cell_type.htm">Cell Type</a></li> |
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MemSpy Carbide Extension 1.6.0
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<li><a href="object_type.htm">Object Type</a></li> |
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<li><a href="parent_binary.htm">Parent Binary</a></li> |
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<li><a href="cell_lenght.htm">Cell Lenght</a></li> |
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<li><a href="HA_data_analysis.htm">Data analysis with Heap Analyser</a></li> |
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</ul> |
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MemSpy Carbide Extension 1.6.0
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parents:
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Matti Laitinen <matti.t.laitinen@nokia.com>
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<div id="footer"> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
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reserved. License: <a |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
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href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.</div> |
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MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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</body> |
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8e12a575a9b5
MemSpy Carbide Extension 1.6.0
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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</html> |