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timethis for 1:  9 wallclock secs ( 7.64 usr +  1.22 sys =  8.86 CPU) 
+@  0.11/s (n=1)

use Benchmark qw(timethis);

...
}

timethis -1, sub { printf "count: %d\n", scalar(() = primes(3_000_000)
+) };