gistfile1.txt

cat cat.js 
#!/usr/bin/env node

var fs = require('fs');
var readline = require('readline');

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function(line) {
  console.log(line);
});


$ cat cat.py 
#!/usr/bin/env python

import json
import sys

for line in sys.stdin:
    sys.stdout.write(line)


$ time ./cat.js < enron-events-sentiment.json > tmp.json

real	0m12.893s
user	0m7.640s
sys	0m3.818s

$ time ./cat.py < enron-events-sentiment.json > tmp.json

real	0m4.504s
user	0m0.660s
sys	0m2.634s

$ strace ./cat.js < enron-events-sentiment.json > tmp.json 2> /tmp/strace.node.out

$ strace ./cat.py < enron-events-sentiment.json > tmp.json 2> /tmp/strace.python.out

$ sed 's/(.*$//' < /tmp/strace.node.out  | sort | uniq -c | sort -nr > /tmp/calls.node.out

$ sed 's/(.*$//' < /tmp/strace.python.out  | sort | uniq -c | sort -nr > /tmp/calls.python.out

$ cat /tmp/calls.node.out | head -10
 518149 write
  63942 futex
  31934 read
  31918 epoll_wait
    185 brk
    128 mmap
     62 munmap
     43 mprotect
     21 fstat
     20 ioctl

$ cat /tmp/calls.python.out | head -10
 402090 write
 380763 read
    353 open
    151 brk
    134 fstat
    126 stat
     89 close
     88 mmap
     68 rt_sigaction
     51 munmap
     
$ strace -T ./cat.js < enron-events-sentiment.json > tmp.json 2> /tmp/strace.time.node.out
     
$ sed 's/(.*</ /' < /tmp/strace.time.node.out | sed 's/>$//'  | awk '{sum [$1] += $2} END {for (i in sum) printf "%s %.6f\n", i, sum[i]}' | sort -nr -k2,2 | head -10

write 6.251365
futex 1.743357
epoll_wait 0.432010
read 0.202860
execve 0.003136
brk 0.002673
munmap 0.001824
mmap 0.001328
mprotect 0.000406
open 0.000362