GNU parallel vs pp.py console

MapBox-FC:multi sean$ time parallel wc ::: /Users/sean/Library/Logs/HipChat/*.txt
    5103   38662  420689 /Users/sean/Library/Logs/HipChat/log-2014-01-02-1.txt
    2109   15175  170369 /Users/sean/Library/Logs/HipChat/log-2014-01-08-1.txt
    4917   36306  400980 /Users/sean/Library/Logs/HipChat/log-2014-01-07-1.txt
     294    2364   26589 /Users/sean/Library/Logs/HipChat/log-2013-12-20-1.txt
    5482   41656  448271 /Users/sean/Library/Logs/HipChat/log-2014-01-10-1.txt
    4160   31137  336279 /Users/sean/Library/Logs/HipChat/log-2014-01-13-1.txt

real	0m0.185s
user	0m0.135s
sys	0m0.072s
MapBox-FC:multi sean$ time ./pp.py wc ::: /Users/sean/Library/Logs/HipChat/*.txt     294    2364   26589 /Users/sean/Library/Logs/HipChat/log-2013-12-20-1.txt
    5103   38662  420689 /Users/sean/Library/Logs/HipChat/log-2014-01-02-1.txt
    4917   36306  400980 /Users/sean/Library/Logs/HipChat/log-2014-01-07-1.txt
    2109   15175  170369 /Users/sean/Library/Logs/HipChat/log-2014-01-08-1.txt
    5482   41656  448271 /Users/sean/Library/Logs/HipChat/log-2014-01-10-1.txt
    4160   31137  336279 /Users/sean/Library/Logs/HipChat/log-2014-01-13-1.txt

real	0m0.159s
user	0m0.059s
sys	0m0.043s

pp.py

#!/usr/bin/env python

import argparse
from multiprocessing import Pool
import logging
import subprocess
import sys

logging.basicConfig(stream=sys.stderr, level=logging.INFO)
logger = logging.getLogger('pp')

parser = argparse.ArgumentParser(
    description="Emulates GNU parallel")
parser.add_argument(
    'program',
    metavar='PROGRAM',
    help="Program to run jobs")
known, unknown = parser.parse_known_args()

# find the parallel args
i = unknown.index(':::')
assert i >= 0
pargs = unknown[i+1:]

def runner(*args):
    return subprocess.check_output([known.program] + list(args))

if __name__ == '__main__':
    pool = Pool()
    results = pool.map(runner, pargs)
    for r in results:
        print(r.rstrip())