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stats_edge.py
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stats_edge.py
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import random
import logging
import collections
import Constants
import central_database as cdb
from wifi_spec import RSSI_MAP_80211n_HT40_1_1_extend
s_request = {'u1':1000, 'u2':2000, 'u3':3000}
rssi = {('u1','edge01'):-56,('u1','edge02'):-90,('u1','edge03'):-100,
('u2','edge01'):-92,('u2','edge02'):-53,('u2','edge03'):-100}
v = {'u1':5.0, 'u2':6.0} # mps
rssi_thresh = -67 # dBm
def wifi_rssi_to_bw(rssi):
for spec in RSSI_MAP_80211n_HT40_1_1_extend[::-1]:
if spec[0] < rssi:
return spec[1].dr_400ns
return RSSI_MAP_80211n_HT40_1_1_extend[0][1].dr_400ns
class StatsEdge(object):
def __init__(self, edge_nodes, netMonitor):
self.t_checkpoints = []
self.size_container = 0
self.edge_nodes = edge_nodes
self.server_names = self.edge_nodes.get_server_names()
self.server_ips = self.edge_nodes.get_ips()
self.netMonitor = netMonitor
# CPU capacity
self.capacities = {'edge01':2.7e9, 'edge02':2.9e9, 'edge03':3.5e9} # GHz
# current assignment (k,i,j):
self.cur_assign = {
'u1': ('edge02', 'edge02'),
'u2': ('edge03', 'edge03')
}
self.num_users = 2
self.num_servers = 3
self.num_bs = 3
def get_cur_assign(self, u, s, b):
assign = self.cur_assign[u]
return 1 if assign[0]==s and assign[1]==b else 0
def get_usr_assign(self, u):
return self.cur_assign[u]
def get_RTT(self, s, next_s):
if s == next_s:
return 0
ip_s = self.edge_nodes.get_server_ip(s)
ip_next_s = self.edge_nodes.get_server_ip(next_s)
rtt_s_next_s = self.netMonitor.get_last_delay(ip_s, ip_next_s)
#print("RTT {}_{} = {}".format(i, next_i, rtt_i_next_i))
return rtt_s_next_s
def add_new_user(self):
self.num_users += 1
def remove_user(self):
self.num_users -= 1
def get_bw(self, u, b, s, delta_time):
# in Mbps
return min(self.get_access_bw(u, b, delta_time),
self.get_edge_bw(b, s, delta_time))
def get_access_bw(self, u, s):
return 54 # Mbps
def get_edge_bw(self, s, next_s):
if s == next_s:
return 10e9
else:
ip_s = self.edge_nodes.get_server_ip(s)
ip_next_s = self.edge_nodes.get_server_ip(next_s)
bw_s_next_s = self.netMonitor.get_last_bw(ip_s, ip_next_s)
#print("bandwidth {}_{} = {}".format(i, next_i, bw_i_next_i))
return bw_s_next_s
def get_size_server(self, s):
S_servers = {'edge01': 250e9,'edge02':150e9,'edge03':200e9} # MB
return S_servers[s]
def get_size_container(self, service_u):
S_containers = {'u1':150e6, 'u2':2000e6, 'u3':345e6}
return S_containers[service_u]
"""
====================== Cost of migration==========================
Estimate Migration time and downtime service
"""
def get_phi(self, s):
# get average t_checkpoint[k][i]*capacities[i] * x[(k,i)]/S_containers[k]
phi = {'edge01':0.01, 'edge02':0.02, 'edge03':0.05}
return phi[s]
def get_rho(self, s):
rho = {'edge01':0.01, 'edge02':0.02, 'edge03':0.05}
return rho[s]
def get_estimate_t_checkpoint(self, u, s):
return self.get_phi(s) * self.get_size_container(u) / self.capacities[s]
def get_estimate_t_transfer(self, u, s, next_s):
return self.get_size_container(u) / self.get_edge_bw(s, next_s)
def get_estimate_t_restore(self, u, next_s):
return self.get_rho(next_s) * self.get_size_container(u) / self.capacities[next_s]
def get_estimate_t_migration(self, u, s, next_s):
t_checkpoint = self.get_estimate_t_checkpoint(u, s)
t_transfer = self.get_estimate_t_transfer(u, s, next_s)
t_restore = self.get_estimate_t_restore(u, next_s)
return (t_checkpoint + t_transfer + t_restore)
def update_t_checkpoint(self, t_checkpoint):
self.t_checkpoints.append(t_checkpoint)
def update_process_delay(self, u, s, delay):
self.proc_delays[(u, s)] = delay
def get_process_delay(self, u, b, s):
# service k, server i
proc_delays = {('u1','edge01', 'edge01'): 0.9, ('u1','edge01', 'edge02'): 0.9,
('u1','edge01', 'edge03'): 0.9,
('u1','edge02', 'edge01'):1.0, ('u1','edge02', 'edge02'):1.0, ('u1','edge02', 'edge03'):1.0,
('u1','edge03', 'edge01'): 1.0, ('u1','edge03', 'edge02'): 1.0, ('u1','edge03', 'edge03'): 1.0,
('u2','edge01', 'edge01'): 0.8, ('u2','edge01', 'edge02'): 0.8, ('u2','edge01', 'edge03'): 0.8,
('u2','edge02', 'edge01'):0.7, ('u2','edge02', 'edge02'):0.7, ('u2','edge02', 'edge03'):0.7,
('u2','edge03', 'edge01'):0.89, ('u2','edge03', 'edge02'):0.89, ('u2','edge03', 'edge03'):0.89 }
return proc_delays[(u, s)]
def get_delta_delay(self, u, s, next_s, b, next_b, delta_time):
if s == next_s and b == next_b:
return 0
delta_delay = self.get_process_delay(u, b, s) * \
(1 - self.capacities[s]/self.capacities[next_s])\
+ s_request[u] * ((1/self.get_bw(u,b,s) - 1/self.get_bw(u,next_b, next_s))\
+ (self.get_RTT(s, b) - self.get_RTT(next_s, next_b)))
return delta_delay
def get_downtime(self, u, s, next_s, b, next_b):
if s == next_s:
return 0
else:
return self.get_estimate_t_migration(u, s, next_s)
def get_server_names(self):
return ['edge01', 'edge02', 'edge03']
def get_bts_names(self):
return ['edge01','edge02', 'edge03']
def get_user_names(self):
return ['u1', 'u2']
class StatsEdgeSql(StatsEdge):
"""A version of stats_edge.StatsEdge, which uses the central SQL database
instead of fake data.
"""
def __init__(self, db_control=None, **kwargs):
if db_control is not None:
self.db = db_control
else:
self.db = cdb.DBCentral(**kwargs)
def get_cur_assign(self, u, s, b):
usr_assign = self.db.query_cur_assign(u)
return 1 if usr_assign[0] == b and usr_assign[1] == s else 0
def get_usr_assign(self, u):
return self.db.query_cur_assign(u)
def get_RTT(self, s, next_s):
if s == next_s:
return 0
return self.db.query_rtt(s, next_s)
def get_bts_edge_RTT(self, b, s):
rtt = self.db.query_bts_to_edge_rtt(b, s)
logging.debug("RTT {} - {} [microsec]:{}".format(b,s,rtt))
return rtt
def get_bw(self, u, b, s, delta_time):
bw = min(self.get_access_bw(u, b, delta_time),
self.get_bts_to_edge_bw(b, s))
logging.debug("Delta={}. BW[Mbps] ubs [{}-{}-{}]={}".
format(delta_time, u, b, s, bw))
return bw
def get_s_request(self, user):
return self.db.query_eu_data_size(user)
def get_full_capacities(self, server_name):
return self.db.query_full_capacities(server_name)
def get_capacities(self, name):
return self.db.query_capacities(name)
def get_access_bw(self, u, b, delta_time):
#timeout = 7*10**6 # microsecond
erssi = self.db.get_est_rssi_bts(u, b, delta_time)
if rssi is None:
return 0
else:
bw = wifi_rssi_to_bw(erssi)
logging.debug("Access BW eRSSI={}, delta={}, u-b[{}-{}]={}".
format(erssi, delta_time, u, b, bw))
return bw
def get_edge_bw(self, s, next_s):
if s == next_s:
return 10e9
else:
return self.db.query_bw(s, next_s)
def get_bts_to_edge_bw(self, b, next_s):
"""Queries BW from BTS to edge server.
.. note::
This approach assumes that the BTS always link with a edge server.
"""
return self.db.query_bts_to_edge_bw(b, next_s)
def get_size_server(self, s):
return self.db.query_server_size(s)
def get_memory_server(self, s):
return self.db.query_server_memory(s)
def get_average_cpu_container(self, end_user):
ret = self.db.query_average_cpu_container(end_user)
return ret
def get_size_container(self, service_u):
ret = self.db.query_size_container(service_u)
return ret
def get_memory_container(self, service_u):
ret = self.db.query_memory_container(service_u)
return ret
def get_neighbor(self, u):
timeout = 5*10**6 # last 5 seconds
ret = self.db.query_neighbor(u, timeout)
return [ i.bts for i in ret if i.rssi > Constants.RSSI_MINIMUM ]
def get_estimated_neighbor(self, u, time):
return self.db.query_neighbor_candidates(u,
Constants.RSSI_MINIMUM,
time)
"""
====================== Cost of migration==========================
Estimate Migration time and downtime service
"""
def get_phi(self, i):
return self.db.query_phi(i)
def get_rho(self, i):
return self.db.query_rho(i)
def get_process_delay(self, u, b, s):
# service for user u, BTS b, server s
return self.db.query_process_delay(u, b, s)
def get_delta_delay(self, u, s, next_s, b, next_b, delta_time):
if s == next_s and b == next_b:
return 0
# current we design app use multiple threads/cores
cur_cap = self.get_full_capacities(s) # in MHz
next_cap = self.get_full_capacities(next_s) # in MHz
cur_bw = self.get_bw(u,b,s,delta_time) # in Mbps
next_bw = self.get_bw(u,next_b, next_s, delta_time) # in Mbps
cur_rtt = self.get_bts_edge_RTT(b, s) # in microsecond
next_rtt = self.get_bts_edge_RTT(next_b, next_s) # in microsecond
# process_delay is in millisecond
old_proc_delay = self.get_process_delay(u, b, s)
if old_proc_delay is None:
return None
process_delay = old_proc_delay *(1 - cur_cap/next_cap)
# self.get_s_request(u) is in byte = 8 bits
# prop_delay is in microsecond
prop_delay = self.get_s_request(u)* 8 *\
(1/cur_bw-1/next_bw) + (cur_rtt-next_rtt)
delta_delay = prop_delay + process_delay * 10.0**3
logging.debug("Est after {} Delta delay [us] {}-[{}-{}][{}-{}]= {}us + {}ms = {}".
format(delta_time, u, b, next_b, s, next_s, prop_delay,
process_delay, delta_delay))
# delta_delay is in microsecond
return delta_delay
def get_est_number_request(self, u, next_s, next_b):
# assume n_request(next_s, next_b) = n_request(u)
ret = self.db.query_number_request(u)
logging.debug("Number est request user {}={}".format(u, ret))
return ret
def get_downtime(self, u, s, next_s, b, next_b):
T_ho = self.db.get_est_handover_time(u, b, next_b)
T_mig = self.db.get_est_mig_time(u, s, next_s) # in second
if T_mig is None:
return None
else:
DT = max(T_mig, T_ho) * 10**6 # convert s to us
logging.debug("Downtime[us] {}-[{}-{}][{}-{}]={}".format(
u, b, next_b, s, next_s, DT))
return DT
def get_max_assoc_users(self, b):
max_assoc_users = 200 # each BS serves max 200 mobile EUs
return max_assoc_users
def get_server_names(self):
return self.db.get_server_names()
def get_bts_names(self):
return self.db.get_bts_names()
def get_user_names(self):
return self.db.get_user_names()
def get_max_rssi_threshold_bts(self, user):
return self.db.get_max_rssi_threshold_bts(user)
def get_max_rssi_bts(self, user):
return self.db.get_max_rssi_bts(user)
def get_bts(self, name, bssid):
return self.db.get_bts_info(name, bssid)
def valid_info(self):
return self.db.valid_info()
def enough_info(self, user, no_connects):
if self.db.est_time_users[user].no_connect < no_connects:
logging.debug("user {} has {} connects < {}".format(user,
self.db.est_time_users[user].no_connect, no_connects))
return False
return True
def get_a_server_with_distance(self, distance):
servers = self.db.get_server_names_with_distance(distance)
print("servers ...{}".format(servers))
if len(servers) > 0:
return random.choice(servers)
else:
return None