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File name : instperf

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#!/usr/libexec/platform-python

import logging
from subprocess import Popen, PIPE
import time

# grab the top five memory consuming processes, returning them in a string of
# of the format:
#
# name1:kB1,name2:kB2,...,name5:kB5
def topProcesses():
    output = Popen(["ps", "-eo", "comm,rss", "--sort", "-rss", "--no-headers"], stdout=PIPE, universal_newlines=True).communicate()[0]
    top5 = output.split("\n")[:5]
    return ",".join("%s:%s" % (proc[0], proc[1]) for proc in (s.split() for s in top5))

def logit():
    buffers = 0
    cached = 0
    memTotal = 0
    memFree = 0
    swapTotal = 0
    swapFree = 0

with open("/proc/meminfo") as f:
        for line in f.readlines():
            if line.startswith("Buffers:"):
                buffers = line.split()[1]
            elif line.startswith("Cached:"):
                cached = line.split()[1]
            elif line.startswith("MemTotal:"):
                memTotal = line.split()[1]
            elif line.startswith("MemFree:"):
                memFree = line.split()[1]
            elif line.startswith("SwapTotal:"):
                swapTotal = line.split()[1]
            elif line.startswith("SwapFree:"):
                swapFree = line.split()[1]

d = {"memUsed": int(memTotal)-int(memFree)-int(cached)-int(buffers),
         "swapUsed": int(swapTotal)-int(swapFree),
         "procs": topProcesses()}

mem_logger.debug("%(memUsed)d %(swapUsed)d %(procs)s", d)

mem_logger = logging.getLogger("memLog")
mem_logger.setLevel(logging.DEBUG)

handler = logging.FileHandler("/tmp/memory.dat")
handler.setLevel(logging.DEBUG)
handler.setFormatter(logging.Formatter("%(asctime)s %(message)s", "%H:%M:%S"))
mem_logger.addHandler(handler)

while True:
    logit()
    time.sleep(1)