Linux check cpu hog processes

pstop.py

#!/usr/bin/env python3
# 
# requires psutil (pip3 install psutil)
#
# This script runs ps_util.cpu_percent(interval=0.5) for each process to calc
# the cpu utilization percentage 
# It does so concurrently as otherwise each calls sleeps 0.5 secs to sample the data
# to run it faster use more threads in ThreadPoolExecutor(max_worker=x or
# reduce the interval for cpu_percent(interval=x
# To make readings more 'accurate' use a longer interval e.g. 1.0 for 1s.
# many processes are short lived and this script may not 'catch' it while it runs.
#
# output is filtered, only processes where utilization > 0.001 is printed
# comment that if ut > 0.001 to print all processes
#
import concurrent.futures
import psutil

def pspct(pid):
    try:
        p = psutil.Process(pid)
        ut = p.cpu_percent(interval=0.5)
        return (pid, p.name(), ut)
    except psutil.NoSuchProcess:
        return None

pids = psutil.pids()
with concurrent.futures.ThreadPoolExecutor(max_workers=8) as executor:
    futures = {executor.submit(pspct, pid): pid for pid in pids}
    for future in concurrent.futures.as_completed(futures):
        try:
            data = future.result()
            if not data is None:
                (pid, name, ut) = data
                if ut > 0.001:
                    print(pid, name, ut)
        except Exception as exc:
            print('thread exception {}'.format(exc))