JDevlieghere added a comment.

I've given this some more though as I see valid points and concerns on both 
sides of the argument. I'm leaning towards running test cases in parallel 
because it offloads more work to lit at negligible cost (running make and 
launching the inferior are the biggest time consumers).

Other advantages are that:

- It would also make it at lot easier to rerun a single test case because lit 
is in a better position to inform us how to reproduce a failure.
- It would give a more granular overview of what passed, failed or skipped. The 
cmake bot on GreenDragon runs the test suite with lit and that means that 
failures are only reported at file level, which imho is to coarse.


https://reviews.llvm.org/D46005



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