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Perf4j+Maven+AspectJ CTW | Jason E. Shao

Perf4j+Maven+AspectJ CTW 2

Recently I’ve incorporated Perf4j for runtime performance statistics on a number of projects, combined with our in-house counters and other standard libs (actually I quite like the annotation-style logging of perf-stats, and the tag-name rollup conventions, and will probably retrofit both into our existing collection tools). I had a bit of difficulay initially getting AspectJ to do CTW for the collection (and in retrospect, very much want to investivate the agent-based LTW approach, since it’d give us the ability to flip on/off recording, while it should be basically just as fast except on object creation – which for Spring/Singleton instantiated services (most of our performance code) is not significant.

Anyhow, the meat, plugin config below:

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<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <version>1.3</version>
    <configuration>
        <showWeaveInfo>true</showWeaveInfo>
        <source>1.6</source>
        <weaveDependencies>
            <dependency>
                <groupId>org.perf4j</groupId>
                <artifactId>perf4j</artifactId>
            </dependency>
        </weaveDependencies>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>compile</goal>
                <!-- use this goal to weave all your main classes -->
                <goal>test-compile</goal>
                <!-- use this goal to weave all your test classes -->
            </goals>
        </execution>
    </executions>
</plugin>

Also dependencies (we use Log4j, though we’re looking at Logback as well):

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<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjrt</artifactId>
    <version>1.6.7</version>
</dependency>
<dependency>
    <groupId>org.perf4j</groupId>
    <artifactId>perf4j</artifactId>
    <version>0.9.13</version>
    <classifier>log4jonly</classifier>
</dependency>
<dependency>
    <groupId>commons-jexl</groupId>
    <artifactId>commons-jexl</artifactId>
    <version>1.1</version>
</dependency>

Performance note: We did some unit testing of methods which were instrumented/non-instrumented (our unit test basically spewed out a couple thousand garbage string+ints in a loop, which was instrumented or not)

We saw something like 3x the number of minor GCs (though GC was still fast) – no additional major GCs after adding Perf4j. Overall execution time was higher as well, though not by the same degree.

2 thoughts on “Perf4j+Maven+AspectJ CTW

  1. lievendoclo Aug 14,2010 7:03 am

    Just a question: how did you get past the NoSuchMethodException on the TimingAspect? I’m trying exactly the same thing, but when I run my @Profiled classes, they always end up with a NSME.

  2. jayshao Aug 14,2010 6:14 pm

    I don’t remember getting a NSME when I was working through – did you make sure to only grab the log4j (or whatever framework you’re using) version of the jar? I know strange things happen trying to weave in all framework versions, since they clobber each other.

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