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https://issues.apache.org/jira/browse/SUREFIRE-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16982956#comment-16982956
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Tibor Digana commented on SUREFIRE-1725:
----------------------------------------

The ForkStarter is common for all providers. We have to debug one of those 
three methods {{run(...)}} or you can do it and help us with your observations.

> Surefire in JUnit Vintage mode distributes tests very unevenly between forks, 
> causing poor parallelism
> ------------------------------------------------------------------------------------------------------
>
>                 Key: SUREFIRE-1725
>                 URL: https://issues.apache.org/jira/browse/SUREFIRE-1725
>             Project: Maven Surefire
>          Issue Type: Bug
>          Components: Junit 4.x support, JUnit 5.x support, Maven Surefire 
> Plugin
>    Affects Versions: 3.0.0-M3
>            Reporter: Gareth Daniel Smith
>            Priority: Major
>         Attachments: junit-5-vintage-bug.zip
>
>
> To reproduce this issue, please run the attached test case using {{mvn clean 
> verify}}
> You will see output similar to the following:
> {code:java}
> [INFO]  T E S T S
> [INFO] -------------------------------------------------------
> [INFO] Running My7Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.017 
> s - in My7Test
> [INFO] Running My9Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.983 
> s - in My9Test
> [INFO] Running My4Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.998 
> s - in My4Test
> [INFO] Running My8Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.999 
> s - in My8Test
> [INFO] Running My6Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.001 
> s - in My6Test
> [INFO] Running My1Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1 s - 
> in My1Test
> [INFO] Running My5Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.999 
> s - in My5Test
> [INFO] Running My3Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.997 
> s - in My3Test
> [INFO] Running My2Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1 s - 
> in My2Test
> [INFO] Running My0Test
> Test in process 32569
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.999 
> s - in My0Test
> {code}
> Notice how all 10 tests are being run on the same process. This is wrong 
> because there should be 5 forks - and the tests should be evenly distributed 
> between them.
> If Junit4 is used instead of Junit5+vintage (see the commented dependency in 
> pom.xml) then this issue does not occur (probably because Surefire uses a 
> different code path in that case).
> Please note that this issue was originally logged against Junit 
> ([https://github.com/junit-team/junit5/issues/2114)] - but they suggested the 
> problem lies within surefire.
> Thanks for any help!



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