Measuring the time properly for nested for-loops with @parallel

General Usage Performance
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2

The macros from BenchmarkTools seem to report the correct times:

julia> using BenchmarkTools

julia> @belapsed f(100,1e6)
4.345676228

julia> @benchmark f(100,1e6)
BechmarkTools.Trial: 2 samples with 1 evaluations.
 Range (min … max):  4.834 s …   4.922 s  ┊ GC (min … max): 5.16% … 5.45%
 Time  (median):     4.878 s              ┊ GC (median):    5.31%
 Time  (mean ± σ):   4.878 s ± 62.011 ms  ┊ GC (mean ± σ):  5.31% ± 0.21%

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  4.83 s         Histogram: frequency by time        4.92 s <

 Memory estimate: 8.94 GiB, allocs estimate: 100004891.
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