A Python script that can show the wired, active, inactive and free memory amounts #macOS #memory

free.py

#!/usr/bin/env python3
"""
Code referenced from `Stack Exchange \
<https://apple.stackexchange.com/questions/4286/is-there-a-mac-os-x-terminal-version-of-the-free-command-in-linux-systems>`_.
**Note**: One need to use Python 3 to run this file!
"""

import re
import subprocess

# Get process info
ps = subprocess.Popen(['ps', '-caxm', '-orss,comm'],
                      stdout=subprocess.PIPE).communicate()[0].decode()
vm = subprocess.Popen(['vm_stat'], stdout=subprocess.PIPE).communicate()[
    0].decode()

# Iterate processes
processLines = ps.split('\n')
sep = re.compile(r'[\s]+')
rssTotal = 0  # kB
for row in range(1, len(processLines)):
    rowText = processLines[row].strip()
    rowElements = sep.split(rowText)
    try:
        rss = float(rowElements[0]) * 1024
    except:
        rss = 0  # Ignore...
    rssTotal += rss

# Process vm_stat
vmLines = vm.split('\n')
sep = re.compile(r':[\s]+')
vmStats = {}
for row in range(1, len(vmLines)-2):
    rowText = vmLines[row].strip()
    rowElements = sep.split(rowText)
    vmStats[(rowElements[0])] = int(rowElements[1].strip(r'\.')) * 4096

GB = 1024**3

print('Wired Memory:{:10.2f} GB'.format(vmStats["Pages wired down"]/GB))
print('Active Memory:{:10.2f} GB'.format(vmStats["Pages active"]/GB))
print('Inactive Memory:{:10.2f} GB'.format(vmStats["Pages inactive"]/GB))
print('Free Memory:{:10.2f} GB'.format(vmStats["Pages free"]/GB))
print('Real Mem Total (ps):{:10.2f} GB'.format(rssTotal/GB))