Python – Total memory used by Python process


Is there a way for a Python program to determine how much memory it's currently using? I've seen discussions about memory usage for a single object, but what I need is total memory usage for the process, so that I can determine when it's necessary to start discarding cached data.

Best Solution

Here is a useful solution that works for various operating systems, including Linux, Windows, etc.:

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

With Python 2.7 and psutil 5.6.3, the last line should be


instead (there was a change in the API later).


  • do pip install psutil if it is not installed yet

  • handy one-liner if you quickly want to know how many MB your process takes:

    import os, psutil; print(psutil.Process(os.getpid()).memory_info().rss / 1024 ** 2)