@spawn large memory allocation reduced when some code abstracted out in a function

General Usage Performance
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2

That may be due to bad performance of captured variables, because right and left are mutated in v0 and are constant in v1, and @spawn creates a closure to execute as a new task.
What if you write v0_p_quicksort with

...
iright, ileft = right, left
t = Threads.@spawn v0_p_quicksort!(A, i,    iright)
                   v0_p_quicksort!(A, ileft, j)

?
That, if my understanding is correct, should make the performance of both versions equal.

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