Threads (including Polyester) question

General Usage Performance
2

The accumulator is shared between threads, causing slow speed and wrong answers.

Try @tturbo. That should do the correct thing.

julia> @btime f(100000)
  25.320 μs (0 allocations: 0 bytes)
3.141602726360119

julia> @btime fturbo(100000)
  7.160 μs (0 allocations: 0 bytes)
3.1416026524898792

This is with 4 threads.
Accuracy is similar,:

julia> π - fturbo(100000)
-9.998900086127804e-6

julia> π - f(100000)
-1.007277032583076e-5
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