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This works: sudo bash -c "echo 1 >/proc/sys/vm/drop_caches"

$ sudo bash -c "echo 1 >/proc/sys/vm/drop_caches"
$ time wc lesms10_big.txt 
...
real 0m0.613s  (5.57x)
user 0m4.168s
sys  0m0.432s

$ sudo bash -c "echo 1 >/proc/sys/vm/drop_caches"
$ time ./wc.pl --max-workers=8 lesms10_big.txt
...
real 0m0.360s  (9.48x)
user 0m4.344s
sys  0m0.625s

$ sudo bash -c "echo 1 >/proc/sys/vm/drop_caches"
$ time wc lesms10_big.txt 
...
real 0m1.804s
user 0m3.339s
sys  0m0.357s