python, c++, node on stdio

gistfile1.sh

erik@roastbeef:~/proj$ cat child.py 
import sys

line = sys.stdin.readline()
while line:
  line = sys.stdin.readline()
erik@roastbeef:~/proj$ time python child.py < bigfile > derp

real	0m0.073s
user	0m0.056s
sys	0m0.008s
erik@roastbeef:~/proj$ cat child.cpp 
#include <iostream>

int main(int argc, char * argv[])
{
  std::ios::sync_with_stdio(false);
  std::string line;
  while (std::getline(std::cin, line))
    std::cout << line << '\n';
}
erik@roastbeef:~/proj$ time ./child < bigfile > derp

real	0m0.366s
user	0m0.076s
sys	0m0.280s
erik@roastbeef:~/proj$ cat child.js
var stdin = process.openStdin();

var buffer = "";

stdin.on("data", function(chunk) {
  buffer += chunk;
  var beg = 0, end = 0;
  while ((end = buffer.indexOf('\n', beg)) >= 0) {
    process.stdout.write(buffer.substr(beg, 1 + end - beg));
    beg = end + 1;
  }
  buffer = buffer.substr(beg);
});

stdin.on("end", function(data) {
  process.stdout.write(buffer);
});
erik@roastbeef:~/proj$ time node child.js < bigfile > derp

real	0m6.307s
user	0m4.208s
sys	0m1.996s