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| © Copyright 2017 Contributors. |
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| |
| <h1>AspectJ 1.8.12 Readme</h1> |
| |
| <p>This is a small release that includes a backport of some 1.9.0 work that improves |
| the performance of Spring AOP (or any system consuming AspectJ in a similar way to Spring). |
| |
| <p>Dave Syer recently created a series of benchmarks for checking the speed of Spring-AspectJ: |
| <tt><a href="https://github.com/dsyer/spring-boot-aspectj">https://github.com/dsyer/spring-boot-aspectj</a></tt> |
| |
| <p>Here we can see the numbers for AspectJ 1.8.11 (on an older Macbook Pro): |
| |
| <pre><code> |
| Benchmark (scale) Mode Cnt Score Error Units |
| StartupBenchmark.ltw N/A avgt 10 2.656 ~ 0.166 s/op |
| StartupBenchmark.ltw_100 N/A avgt 10 2.618 ~ 0.063 s/op |
| StartupBenchmark.spring v0_10 avgt 10 2.071 ~ 0.044 s/op |
| StartupBenchmark.spring v1_10 avgt 10 2.210 ~ 0.058 s/op |
| StartupBenchmark.spring v1_100 avgt 10 2.260 ~ 0.068 s/op |
| StartupBenchmark.spring v10_50 avgt 10 2.933 ~ 0.039 s/op |
| StartupBenchmark.spring v20_50 avgt 10 3.832 ~ 0.094 s/op |
| StartupBenchmark.spring v20_100 avgt 10 3.959 ~ 0.047 s/op |
| StartupBenchmark.spring a0_10 avgt 10 2.073 ~ 0.028 s/op |
| StartupBenchmark.spring a1_10 avgt 10 2.729 ~ 0.061 s/op |
| StartupBenchmark.spring a1_100 avgt 10 2.750 ~ 0.029 s/op |
| StartupBenchmark.spring a10_50 avgt 10 7.153 ~ 0.075 s/op |
| StartupBenchmark.spring a10_100 avgt 10 7.152 ~ 0.059 s/op |
| StartupBenchmark.spring a20_50 avgt 10 11.430 ~ 0.105 s/op |
| StartupBenchmark.spring a20_100 avgt 10 11.497 ~ 0.162 s/op |
| </code></pre> |
| |
| <p>So this is the average *startup time* of an app affected by aspects applying to the beans involved. |
| Where numbers are referenced the first is the number of aspects/pointcuts and the second |
| is the number of beans. The 'a' indicates an annotation based pointcut vs a non-annotation |
| based pointcut ('v'). Notice things are much worse for annotation based pointcuts. At 20 |
| pointcuts and 50 beans the app is 9 seconds slower to startup. |
| <br> |
| |
| <p>In AspectJ 1.8.12 and 1.9.0.RC1 some work has been done here. The key change is to recognize that the use |
| of annotations with runtime retention is much more likely than annotations with class level |
| retention. Retrieving annotations with class retention is costly because we must open the |
| bytes for the class file and dig around in there (vs runtime retention which are immediately |
| accessible by reflection on the types). In 1.8.11 the actual type of the annotation involved |
| in the matching is ignored and the code will fetch *all* the annotations on the type/method/field |
| being matched against. So even if the match is looking for a runtime retention annotation, we |
| were doing the costly thing of fetching any class retention annotations. In 1.8.12/1.9.0.RC1 |
| we take the type of the match annotation into account - allowing us to skip opening the classfiles |
| in many cases. There is also some deeper work on activating caches that were not previously |
| being used correctly but the primary change is factoring in the annotation type. |
| |
| <p>What difference does that make? |
| |
| AspectJ 1.8.12: |
| <pre><code> |
| Benchmark (scale) Mode Cnt Score Error Units |
| StartupBenchmark.ltw N/A avgt 10 2.620 ~ 0.130 s/op |
| StartupBenchmark.ltw_100 N/A avgt 10 2.567 ~ 0.038 s/op |
| StartupBenchmark.spring v0_10 avgt 10 2.044 ~ 0.027 s/op |
| StartupBenchmark.spring v1_10 avgt 10 2.195 ~ 0.026 s/op |
| StartupBenchmark.spring v1_100 avgt 10 2.237 ~ 0.039 s/op |
| StartupBenchmark.spring v10_50 avgt 10 2.774 ~ 0.038 s/op |
| StartupBenchmark.spring v20_50 avgt 10 3.488 ~ 0.116 s/op |
| StartupBenchmark.spring v20_100 avgt 10 3.642 ~ 0.080 s/op |
| StartupBenchmark.spring a0_10 avgt 10 2.067 ~ 0.034 s/op |
| StartupBenchmark.spring a1_10 avgt 10 2.159 ~ 0.030 s/op |
| StartupBenchmark.spring a1_100 avgt 10 2.207 ~ 0.020 s/op |
| StartupBenchmark.spring a10_50 avgt 10 2.471 ~ 0.031 s/op |
| StartupBenchmark.spring a10_100 avgt 10 2.517 ~ 0.045 s/op |
| StartupBenchmark.spring a20_50 avgt 10 2.842 ~ 0.049 s/op |
| StartupBenchmark.spring a20_100 avgt 10 2.916 ~ 0.145 s/op |
| </code></pre> |
| |
| <p>Look at the a20_100 case - instead of impacting start time by 9 seconds, it impacts it by 1 second. |
| |
| <ul> |
| <li>1.8.12 available 20-Oct-2017 |
| </ul> |
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