[GitHub] [qpid-jms] gemmellr commented on pull request #47: Run all the tests in multiple forked VM

[GitBox <gi...@apache.org>]

gemmellr commented on PR #47:
URL: https://github.com/apache/qpid-jms/pull/47#issuecomment-1108330617

   The change proposed of using 1.5C forkCount by default is not one we will be making, for a variety of reasons such as:
   
   - Mostly that the tests wont necessarily all handle it, and as the various CI failures shows, they dont.
   - Test consistency.
   - More JVMs will often mean more memory being used, not less.
   - More JVMs means mores threads, as does more tests, probably slowing things down in lower resource envs like CI, rather than speeding them up.
   - The overall run not being all that long currently.
   
   Running all the tests in parallel requires that all the tests have explicitly been written with that in mind, and that everything they do/use is able to handle it. Whilst many will work just fine, particularly the pure unit tests, some of the tests or things they used invariably will not as they simply arent written to cater for it, particularly in the system testing.


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