cloudflare.com
sort
--parallel
--buffer-size
--unique
hash(item)
n
m
k
p
uniq
%modulo
div
wc -l
wc
mmuniq-bloom
siphash24
strace
mmap
MAP_POPULATE
perf
perf annotate process_line --source
mov
uint64_t v = *p
perf stat -d
40 000 000/2^64
'~n^2/2m
~(40M^2)/(2*(2^64))
prefetch