晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib/python3.6/site-packages/tuned/monitors/monitor_net.py
import tuned.monitors
import os
import re
from tuned.utils.nettool import ethcard

class NetMonitor(tuned.monitors.Monitor):

	@classmethod
	def _init_available_devices(cls):
		available = []
		for root, dirs, files in os.walk("/sys/devices"):
			if root.endswith("/net") and not root.endswith("/virtual/net"):
				available += dirs
		
		cls._available_devices = set(available)

		for dev in available:
			#max_speed = cls._calcspeed(ethcard(dev).get_max_speed())
			cls._load[dev] = ['0', '0', '0', '0']

	@classmethod
	def _calcspeed(cls, speed):
		# 0.6 is just a magical constant (empirical value): Typical workload on netcard won't exceed
		# that and if it does, then the code is smart enough to adapt it.
		# 1024 * 1024 as for MB -> B
		# speed / 8  Mb -> MB
		return (int) (0.6 * 1024 * 1024 * speed / 8)

	@classmethod
	def _updateStat(cls, dev):
		files = ["rx_bytes", "rx_packets", "tx_bytes", "tx_packets"]
		for i,f in enumerate(files):
			with open("/sys/class/net/" + dev + "/statistics/" + f) as statfile:
				cls._load[dev][i] = statfile.read().strip()

	@classmethod
	def update(cls):
		for device in cls._updating_devices:
			cls._updateStat(device)

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