This code below takes 31 seconds elapsed bare, and 36 seconds elapsed under
valgrind.
The charged CPU time is 119 seconds bare, 35 seconds under valgrind.
That was valgrind-3.12.0.
With valgrind-3.13.0 on Core i5-6500 CPU @ 3.20 GHz,
I see 34 seconds bare (129 CPU seconds),
and 25 seconds valgrind ( 25 CPU seconds).
With --fair-sched=yes:
3.12.0: 50 seconds elapsed, 50 seconds CPU [i5-2500. 3.3GHz]
3.13.0: 54 seconds elapsed, 54 seconds CPU [i5-6500, 3.2GHz]
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