LTW classloader lock prevents multi-thread usage

[SampadSikder]

Hello.
In our project we use LTW in development process. Recently we improved one of the part of our application to use multiple thread to load classes (to speed up application start). But results of parallelizing is far from idea. Threads were mostly blocked by this lock:
https://github.com/eclipse/org.aspectj/blob/063d3cc59aad88f02bc82bc6e417a828dae9ef2d/loadtime/src/main/java/org/aspectj/weaver/loadtime/Aj.java#L99

[SampadSikder]

Issue processed successfully. Here is the possible list of buggy files:

Rank: 1, File: https://github.com/SampadSikder/aspectj/org.aspectj.systemtest.ajc152.SynchronizationTests.java, Score: 0.04612937433722163
Rank: 2, File: https://github.com/SampadSikder/aspectj/org.aspectj.tools.ajc.AjcTestCase.java, Score: 0.04494949494949495
Rank: 3, File: https://github.com/SampadSikder/aspectj/org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.java, Score: 0.043498817966903074
Rank: 4, File: https://github.com/SampadSikder/aspectj/org.aspectj.testing.harness.bridge.JavaRun.java, Score: 0.042572062084257206
Rank: 5, File: https://github.com/SampadSikder/aspectj/coordination.MethodState.java, Score: 0.04111766160935768
Rank: 6, File: https://github.com/SampadSikder/aspectj/org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptorTest.java, Score: 0.03970125786163522
Rank: 7, File: https://github.com/SampadSikder/aspectj/org.aspectj.internal.tools.ant.taskdefs.MainWrapper.java, Score: 0.039649256576439196
Rank: 8, File: https://github.com/SampadSikder/aspectj/org.aspectj.testing.AntSpec.java, Score: 0.03840579710144927
Rank: 9, File: https://github.com/SampadSikder/aspectj/org.aspectj.weaver.tools.WeavingAdaptor.java, Score: 0.037241379310344824
Rank: 10, File: https://github.com/SampadSikder/aspectj/org.aspectj.ajde.Ajde.java, Score: 0.03624078624078624

[SampadSikder]

Okay, let's analyze the provided data to find the most common top 10 files between the two lists.

File 1:

1. org.aspectj.testing.harness.bridge.JavaRun.java
2. org.aspectj.weaver.ltw.LTWWorld.java
3. org.aspectj.internal.tools.ant.taskdefs.MainWrapper.java
4. org.aspectj.ajde.Ajde.java
5. org.aspectj.tools.ajc.AjcTestCase.java
6. org.aspectj.systemtest.ajc152.SynchronizationTests.java
7. org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.java
8. org.aspectj.weaver.bcel.ClassLoaderRepositoryTest.java
9. org.aspectj.util.LangUtil.java
10. org.aspectj.weaver.loadtime.Aj.java

File 2:

1. Blob.java
2. org.aspectj.systemtest.ajc152.SynchronizationTests.java
3. de.scrum_master.app.Application.java
4. Application.java
5. org.aspectj.tools.ajc.AjcTestCase.java
6. org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.java
7. org.aspectj.testing.AntSpec.java
8. NestedSynchronized.java
9. org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptorTest.java
10. org.aspectj.weaver.loadtime.WeavingURLClassLoaderTest.java

Finding Common Top 10s

Now, let's identify the files that appear in the top 10 of both lists:

1. org.aspectj.systemtest.ajc152.SynchronizationTests.java
2. org.aspectj.tools.ajc.AjcTestCase.java
3. org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.java

Therefore, the most common files appearing in the top 10 of both lists are:

1. org.aspectj.systemtest.ajc152.SynchronizationTests.java
2. org.aspectj.tools.ajc.AjcTestCase.java
3. org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.java

Important Note: It is impossible to have 10 common elements since the first dataset has 10 elements and the second dataset has 10 different elements with the exception of 3 duplicate elements.