The code always returns 0.0 values, regardless of interval values.
import psutil
p = psutil.Process()
print p.cpu_percent(interval=1)
print p.cpu_percent(interval=None)
This behaviour is documented:
When interval is
0.0
orNone
compares process times to system CPU times elapsed since last call, returning immediately. That means the first time this is called it will return a meaningless0.0
value which you are supposed to ignore. In this case is recommended for accuracy that this function be called a second time with at least0.1
seconds between calls.
There is also a warning against using interval=None
for a single call:
Warning: the first time this function is called with interval =
0.0
orNone
it will return a meaningless0.0
value which you are supposed to ignore.
If using interval=None
, make sure to call .cpu_percent
compared to a prior call.
p = psutil.Process(pid=pid)
p.cpu_percent(interval=None)
for i in range(100):
usage = p.cpu_percent(interval=None)
# do other things
instead of:
for i in range(100):
p = psutil.Process(pid=pid)
p.cpu_percent(interval=None)
# do other things