Comment by anonymoushn

For a solution that contains this stuff

  const u8 *file_lo;
  file_lo = (const u8*)mmap(0,250000000ull,PROT_READ,MAP_PRIVATE|MAP_POPULATE,0,0);
  const u8 *file_hi = file_lo + 250000000ull;
  u64 count = 0;
  while (file_lo < file_hi) {
    if (*file_lo == 127) {
        ++count;
    }
    file_lo++;
  }

I got a bit under 54ms. The solution in the article runs in a bit under 16ms.