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| <div id="midcolumn"><h1><span style="font-size: 140%">Project Plan For |
| <a href="http://www.eclipse.org/projects/project_summary.php?projectid=technology.mat">Memory Analyzer</a></span>, version 0.8</h1><div id="toc"><p><a name="toc"><strong>Table of Contents</strong></a></p><ul><li><a href="#introduction">Introduction</a></li><li><a href="#release_deliverables"> |
| Release Deliverables |
| </a></li><li><a href="#release_milestones"> |
| Release Milestones |
| </a></li><li><a href="#target_environments"> |
| Target Environments |
| </a></li><li><a href="#compatibility"> |
| Compatibility with Previous Releases |
| </a></li><li><a href="#themes_and_priorities"> |
| Themes and Priorities |
| </a></li></ul></div><h2><a name="introduction">Introduction</a></h2><div> |
| <p>The Memory Analyzer has a rich set of features to analyze heap dumps |
| from various VM vendors. The main focus is now on |
| <strong>growing the community</strong> around the tool and, |
| hopefully, eventually maturing from incubation.</p> |
| |
| <p>The next step is releasing the currently available code base as |
| version <strong>0.7</strong>. The rationale is this: First of all, |
| we have external dependencies (the DTFJ Parser provided by IBM and |
| distributed via IBM's Alphaworks page) which require a stable version. |
| Secondly, we hope to increase community interest by providing |
| a released version.</p> |
| |
| <p>This project plan is concerned with the development wave beyond |
| this initial 0.7 release.</p> |
| </div><h2><a name="release_deliverables">Release Deliverables</a></h2><div> |
| The Memory Analyzer is delivered as |
| <ul> |
| <li>stand-along RCP version via Eclipse.Org download server.</li> |
| <li>feature to be installed into an Eclipse IDE installation using an update site.</li> |
| </ul> |
| </div><p><a href="#toc">Table of Contents</a></p><h2><a name="release_milestones">Release Milestones</a></h2><div> |
| We plan to build and publish a stable version of the Memory Analyzer on a monthly basis. |
| </div><table border="1" align="center"><tr><td><b>0.7</b></td><td>11/15/2008</td><td><div>Tentative Release Date 0.7</div></td></tr><tr><td><b>0.8</b></td><td>3/1/2009</td><td><div>Tentative Release Date 0.8</div></td></tr></table><p><a href="#toc">Table of Contents</a></p><h2><a name="target_environments">Target Environments</a></h2><div> |
| The Memory Analyzer requires Java 5 and runs on Eclipse 3.3 (Europa) and greater. |
| A stand-alone version is provided on the download server which is build with the latest |
| available platform (currently Eclipse 3.4 Ganymede). |
| </div><h3>Internationalization</h3> |
| <div>Currently, the Memory Analyzer is not prepared to be translated. String constants |
| are not yet externalized into resource bundles.</div> |
| <p><a href="#toc">Table of Contents</a></p><h2><a name="compatibility">Compatibility with Previous Releases</a></h2><div>Binary and source compatibility is expected for the Snapshot and Parser API.</div><p><a href="#toc">Table of Contents</a></p><h2><a name="themes_and_priorities">Themes and Priorities</a></h2><h3>Comparing Heap Dumps</h3><div> |
| <p>A heap dump contains a snapshot of the Java heap at one point in time. |
| Every address is uniquely identified by its address. However, the addresses |
| do not remain stable because the Garbage Collector is constantly moving |
| objects around and thereby changing their addresses. Therefore only aggregates |
| can be compared easily.</p> |
| <ul> |
| <li><em>Compare Multiple Heap Dumps (not only two) on the Basis |
| of the Class Histogram, Class Loader Histogram and Packages.</em><br/> |
| The idea is to create a wizard which guides the user step-by-step |
| from the selection of the heap dumps to the results. |
| </li> |
| <li><em>Research Ways to Detect Leak Suspects Based on Comparing Heap Dumps.</em><br/> |
| This is a rather open topic. The idea is to find growing structures |
| like maps which could indicate a leak suspect. |
| </li> |
| </ul> |
| </div><h3>Usability Features</h3><div> |
| <p>Usability of the Memory Analyzer is important in order to attract new user groups.</p> |
| <ul> |
| <li><em>Interactively Acquire Heap Dumps. (<a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=229449">229449</a>)</em><br/> |
| The latest virtual machines provide interfaces to acquire a heap dump on demand. For example, |
| Sun Java 6 VM provides a JMX extension, on Unix platforms the command-line utility jmap is |
| available. This feature adds a wizard to acquire a heap dump from a virtual machine |
| running on the local computer. The goal is to ease interactive analysis of an application |
| and reduce the time for novices to get started. |
| </li> |
| <li><em>Extend OQL to Handle Query Commands.</em><br/> |
| Reports like the component report aggregate a lot of data into a single HTML page. |
| To be able to drill down, it must be possible to go back to the heap dump |
| and retrieve the objects. This requires an extension to the OQL to |
| execute queries and a mechanism identify rows / tree nodes from the result. |
| </li> |
| <li><em>Equinox OSGi Bundle Explorer</em><br/> |
| It should be possible to extract from the heap dump the state of the Equinox |
| runtime: bundles and their status, dependencies, registered and used services, |
| extension points etc. For a live system, this is available via the Plug-In Registry |
| Viewer (if installed), in the post-mortem case the MAT can help. |
| </li> |
| </ul> |
| </div><h3>Documentation Improvement</h3><div> |
| <p>The Memory Analyzer documentation is available as (a) help plug-in, (b) WIKI pages |
| and (c) blog postings for special topics. The documentation covers a broad range |
| of topics, but we acknowledge that it is often brief and not easily accessible |
| to non-domain experts.</p> |
| <ul> |
| <li><em>Restructure the documentation along tasks.</em><br/> |
| The documentation should concentrate on tasks ("find leaks" or "reduce footprint") |
| instead of features. This should reduce the learning curve of new users. |
| </li> |
| <li><em>Improve the context help available for heap dump inspections.</em><br/> |
| Today MAT displays a help button if a particular inspection provides context help. |
| However, right now help is only available for immediate dominators and the |
| component report. More context help is needed. |
| </li> |
| <li><em>Publish the Help Plug-in contents on the Eclipse.Org Page.</em><br/> |
| Additionally delivering the help content via web pages will make them searchable |
| via search engines like Google. This should attract new users to the tool. |
| </li> |
| </ul> |
| </div><h3>Building A Community</h3><div> |
| <p>A vibrant community is essential for the long term health of any project. |
| The Memory Analyzer is in a difficult position, because it is a niche tool |
| which not only requires some significant domain knowledge about memory analysis |
| but also is utilized only sporadically during the development of big applications. |
| </p> |
| <ul> |
| <li>Participate in the Galileo Simultaneous Release.</li> |
| <li>Demo the Memory Analyzer at the Eclipse Summit Europe.</li> |
| <li>Be responsive to questions posted to the newsgroup and Bugzilla reports.</li> |
| <li>Regularly blog about memory related topics.</li> |
| </ul> |
| </div><p><a href="#toc">Table of Contents</a></p></div> |
| </div> |
| </div> |
| <div style="visibility: hidden; float: right; text-align: right"><a href="?projectid=technology.mat&raw=1">view raw xml of project plan</a><br> |
| <a href="http://www.eclipse.org/projects/dev_process/project-status-infrastructure.php">from project meta-data key "projectplanurl"</a></div> |
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