cpp $gcc -g -O2 -Wall usleep.c
cpp $time ./a.out
real 0m4.249s
user 0m0.000s
sys 0m1.176s
cpp $time ./a.out
real 0m2.238s
user 0m0.000s
sys 0m0.664s
cpp $time ./a.out
real 0m1.975s
user 0m0.000s
sys 0m0.604s
cpp $time ./a.out
real 0m7.745s
user 0m0.000s
sys 0m2.296s
cpp $time ./a.out
real 0m3.088s
user 0m0.000s
sys 0m0.876s
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