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Benchmark: running Step 1, Step 2, Step 3 for at least 10 CPU seconds.
+..
    Step 1: 10 wallclock secs (10.47 usr +  0.02 sys = 10.49 CPU) @ 18
+5755.48/s (n=1948575)
    Step 2: 11 wallclock secs (10.48 usr +  0.02 sys = 10.50 CPU) @ 18
+7398.10/s (n=1967680)
    Step 3: 10 wallclock secs (10.01 usr +  0.00 sys = 10.01 CPU) @ 31
+5978.92/s (n=3162949)

#!/usr/bin/perl -w

...
  'Step 2' => 'step2(500000, @array)',
  'Step 3' => 'step3(500000, @array)'
});