psutil.Process.get_memory_info中RSS的单位是什么？

Question

When I use ps -o pid,rss -p 1 , I see the following:

PID RSS
  1 784

But when I query for rss with psutil , I get a different value:

>>> p = psutil.Process(1)
>>> print p.get_memory_info().rss
802816

Is it possible that psutil uses a different unit? I can't find any related information in the documentation .

Answer 1

The output of ps is in kiloBytes. RSS (resident set size) from psutil is in bytes.

>>> 802816 / 784
1024 

From man ps :

rss         RSS       resident set size, the non-swapped physical 
           memory that a task has used (in kiloBytes).  (alias rssize, rsz).

Answer 2

import os
import psutil
process = psutil.Process(os.getpid())
print(process.memory_info().rss)  # in bytes