$ psrecord 49119 --plot ~/prof.png --duration 60
Attaching to process 49119
Traceback (most recent call last):
File "/Users/jeffery/Library/Python/3.8/bin/psrecord", line 7, in <module>
sys.exit(psrecord.main())
File "/Users/jeffery/Library/Python/3.8/lib/python/site-packages/psrecord/main.py", line 103, in main
monitor(pid, logfile=args.log, plot=args.plot, duration=args.duration,
File "/Users/jeffery/Library/Python/3.8/lib/python/site-packages/psrecord/main.py", line 219, in monitor
ax.set_ylim(0., max(log['cpu']) * 1.2)
ValueError: max() arg is an empty sequence
