mem_wasted.py
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Authored by ori on Apr 15 2016, 7:42 PM.

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	F3879981: mem_wasted.py
	Apr 15 2016, 7:42 PM

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	import collections
	import contextlib
	import re
	import telnetlib

	servers = [('mc10%02d.eqiad.wmnet' % n) for n in range(1, 19)]

	GB = float(1024 ** 3)

	def get_slab_stats(host, port=11211):
	with contextlib.closing(telnetlib.Telnet(host, port)) as client:
	client.write('stats slabs\n')
	data = client.read_until('END')
	slabs = {}
	for line in data.split('\n'):
	try:
	slab, key, value = re.search(
	'STAT (\d+):(\w+) (\d+)', line).groups()
	except AttributeError:
	break
	else:
	slabs.setdefault(int(slab), {})[key] = int(value)
	return slabs


	total_wasted = 0
	for server in servers:
	wasted = 0
	for s in get_slab_stats(server).values():
	wasted += ((s['total_chunks'] * s['chunk_size']) - s['mem_requested'])
	total_wasted += wasted
	print('\| {:<20s} \| {:>6.2f} gB \|'.format(server, wasted / GB))

	print('\| {:<20s} \| {:>6.2f} gB \|'.format('Total', total_wasted / GB))
	print('\| {:<20s} \| {:>6.2f} gB \|'.format('Avg', total_wasted / (GB * len(servers))))

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