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Use j.u.c.Forkjoin directly in active and disabled tests
Remove bitrotted benchmarks code
I was going to update these to use `java.util.concurrent.ForkJoin`
directly, instead of our deprecated stubs.
But most of them don't compile anymore (e.g. scala.testing.Benchmark
has been removed, ClassTag imports missing).
While I'm all for benchmarks, we should have large swathes of code
checked in that isn't at compiled and run automatically.
I'm happy to help someone resurrect these in a suitable form.
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This change resolves some issues with ParCtrie splitters and their
`remaining` method, which currently evaluates the size of the Ctrie.
Since this is still not done lazily, nor in parallel, it has a certain cost,
which is unacceptable.
Change #1: The `shouldSplitFurther` method is by default implemented by
calling the `remaining` method. This method now forwards the call to the
same method in the splitter which is by default implemented in the same
way as before, but can be overridden by custom collections such as the
ParCtrie.
Change #2: ParCtrie splitter now has a `level` member which just counts
how many times the method has been split. This information is used to
override the default `shouldSplitFurther` implementation.
Change #3: The tasks and splitters rely heavily on the `remaining` method
in the splitter for most operations. There is an additional method called
`isRemainingCheap` which returns true by default, but can be overridden
by custom collections such as the `Ctrie`.
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