script for getting system memory info over command line

mem.py

#!/usr/bin/env python

from subprocess import Popen
from subprocess import PIPE
from re import compile

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

# Iterate processes
processLines = ps.split('\n')
sep = compile('[\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 = compile(':[\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('\.')) * 4096

print 'Wired Memory:\t\t%d MB' % (vmStats["Pages wired down"]/1024/1024)
print 'Active Memory:\t\t%d MB' % (vmStats["Pages active"]/1024/1024)
print 'Inactive Memory:\t%d MB' % (vmStats["Pages inactive"]/1024/1024)
print 'Free Memory:\t\t%d MB' % (vmStats["Pages free"]/1024/1024)
print 'Real Mem Total (ps):\t%.3f MB' % (rssTotal/1024/1024)