import sys

import os

import time

def print_mem_usage(pid):

    """

    Get system resources used by process pid

      @param pid process id

    @returns dict of {"pid":pid, "memory":mem_usage}

    """

    columns = "%cpu,%mem,etime"

    ps_out = os.popen('ps -p %d -o %s' % (pid, columns)).readlines()

    if len(ps_out) == 2:

        out_list = ps_out[1].rstrip().split()

        col_list = columns.split(",")

        out = dict(zip(col_list, out_list))

        print pid, out

        return True

    else:

        return False

def main(pid_list):

    """

    Iterate over list of pids; while pids exist, print cpu usage etc

    """

    while len(pid_list) > 0:

        time.sleep(5)

        _pid_list = []

        for pid in pid_list:

            if print_mem_usage(int(pid)):

                _pid_list.append(pid)

        pid_list = _pid_list

if __name__ == "__main__":

    main(sys.argv[1:])