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| <h1>AJDT 1.6.1 - New and Noteworthy</h1> |
| |
| <table border="0" cellpadding="10" cellspacing="0" width="80%"> |
| <tbody> |
| <tr> |
| <td valign="top"><b>Overview</b></td> |
| <td valign="top">For this release, we have focussed on improving the performance |
| of AJDT builds, particularly incremental builds in multi-project settings. Most of |
| our effort for this release has been towards ensuring efficiency in the core of AJDT. |
| After upgrading to this release, you should notice that improvements in your build |
| times for AspectJ projects. |
| </td> |
| </tr> |
| <tr> |
| <td colspan="2"> |
| <hr></td></tr> |
| <tr> |
| <td valign="top"><b>Crosscutting model enhancements</b></td> |
| <td> |
| <p> |
| In this release, AJDT's internal representation of the crosscutting |
| model has been made redundant and has been removed. The old way of |
| doing things was that AJDT maintained its own copy of the model |
| AspectJ was using internally for builds. And it was recreated from |
| scratch after each successful build (both full and incremental builds, |
| even if there were no changes!). The AJDT copy was more suitable for |
| AJDT to work with when creating markers, populating views, etc. |
| However, with some changes to AspectJ, the compiler's internal model |
| has been modified to suit AJDT's needs directly--thereby removing any |
| need for a duplicate model and saving memory and computation. There |
| is a significant speed-up. |
| </p> |
| <p> |
| The following numbers are the times for performing a full build of the |
| workspace in a setting where there are 60 interrelated small AspectJ projects |
| with some pervasive Aspects. |
| </p> |
| |
| <table border="1" cellpadding="5"> |
| <tr><td><i>AJDT 1.6.0</i></td><td><i>AJDT 1.6.1</i></td></tr> |
| <tr><td>68 seconds</td><td><b>42 seconds</b></td></tr> |
| </table> |
| |
| <p>Note- average of 3 runs running on a Macbook 2.4 GHz Intel Core 2 Duo, 4GB ram.</p> |
| |
| <p> |
| Unfortunately, in order to implement this improvement, we had to |
| disable the crosscutting comparisons view, because it requires AJDT's |
| specific crosscutting model. Our understanding is that this view was |
| not used often, but if there is enough community interest, we will |
| re-enable the feature. Our goal is to optimize for the common use |
| case - and we believe that 90% of the time users will be doing quick |
| edit/save/build cycles, rather than using views like the crosscutting |
| comparisons view. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td colspan="2"> |
| <hr></td> |
| </tr> |
| |
| <tr><td valign="top"><b>Incremental build optimizations</b></td> |
| <td> |
| <p> |
| The second major improvement in this release has been improved |
| performance during incremental builds. There is now more fine-grained |
| communication between AJDT and AspectJ before incremental builds. |
| Previously AspectJ did comprehensive analysis of the classpath, |
| inpath, aspectpath, etc.--in order to determine what needed to be |
| compiled. Even though AJDT already has precise knowledge of what the |
| user had changed, there was no communications interface between AJDT |
| and the compiler to transfer this information. Now before an |
| incremental build, AJDT instead provides the compiler with specific |
| information about what state has changed since the last successful |
| build. And the compiler will then only do appropriate analysis. |
| </p> |
| <p> |
| The following numbers show the times for making a whitespace change to |
| a non-aspect java file in a project that 59 other projects depend on. |
| </p> |
| <table border="1" cellpadding="5"> |
| <tr><td><i>AJDT 1.6.0</i></td><td><i>AJDT 1.6.1</i></td></tr> |
| <tr><td>27 seconds</td><td><b>6.5 seconds</b></td></tr> |
| </table> |
| |
| <p> |
| These number show the time to build after a change to a non-Java/AspectJ resource |
| in a project that 59 other projects depend on:</p> |
| |
| <table border="1" cellpadding="5"> |
| <tr><td><i>AJDT 1.6.0</i></td><td><i>AJDT 1.6.1</i></td></tr> |
| <tr><td>26 seconds</td><td><b>< 1 second!</b></td></tr> |
| </table> |
| |
| <p> |
| These numbers illustrate the kinds of situations we are optimizing for in AJDT. |
| These are situations where a programmer makes a small edit to a file and saves, |
| and an incremental build is kicked off. We have tried hard to ensure that the |
| time for an incremental build of this kind is fast enough so that programmers |
| are not tempted to turn off <i>Build automatically</i> when editing AspectJ |
| projects. |
| </p> |
| |
| </td> |
| </tr> |
| <tr> |
| <td colspan="2"> |
| <hr></td> |
| </tr> |
| |
| |
| <tr><td valign="top"><b>Multi-threaded builds</b></td> |
| <td> |
| <p> |
| The final major improvement in this release is a multi-threaded build. |
| Now, the essential part of the build (compilation) occurs in a single |
| thread, and the more peripheral post build jobs (updating of gutter |
| markers, and displaying error and warning messages) occur in separate |
| threads. This frees the UI from sluggish builds and gives the user |
| more control over the workspace. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td colspan="2"> |
| <hr></td> |
| </tr> |
| <tr> |
| <td valign="top"><b>Bug fixes</b></td> |
| <td> |
| <ul> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=70774">70774</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=242354">242354</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=243376">243376</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=244197">244197</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=244735">244735</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=245566"245566></a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=245927">245927</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=246476"246476></a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=246949">246949</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=248512">248512</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=248677">248677</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=249216">249216</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=249380">249380</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=249556">249556</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=249881">249881</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=250375">250375</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=251111">251111</a></li> |
| <li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=251420">251420</a></li> |
| </td> |
| </tr> |
| <tr> |
| <td colspan="2"> |
| <hr></td> |
| <tr> |
| <td valign="top"><b>Previous Releases</b></td> |
| <td> |
| See <a href="http://www.eclipse.org/ajdt/whatsnew16/index.html">here</a> |
| for information on the new features in AJDT 1.6. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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