我正在尝试使用 Simpy v3 模拟特定时间的客户到达(不是根据统计分布生成的(。到达时间在我加载到 pandas 数据帧中的 csv 文件中定义。
在之前的 Simpy (v2.2( 版本中,激活函数"at"有一个参数,它将在特定实例中激活客户 activate(c,c.visit(timeInBank),at=5.0)
.如何在 Simpy 版本 3 中执行此操作?
数据帧"df"传递每个客户的到达时间
df.head()
arrival_time start_service end_service waiting_time service_duration
09:00:20 09:01:00 09:06:00 0.40 5.00
09:01:00 09:02:20 09:04:00 1.20 1.40
.
import random
import simpy
import pandas as pd `
def source(env, df, counter):
for i, row in df.iterrows():
c = client(env, 'Client%02d' % i, counter, row,time_in_bank=row["service_duration"])
env.process(c)
def client(env, name, counter, row, time_in_bank):
arrive = env.now # probably some changes to be done here
print('%s arrived at %7.4f' % (name,arrive))
with counter.request() as req:
results = yield req
wait = env.now - row["waiting_time"]
print('%s waited %6.3f' % (name, wait))
yield env.timeout(time_in_bank)
print('%s exited the office at %7.4f' % (name, env.now))
df = pd.read_csv("arrivals.csv",sep=",",header=0)
env = simpy.Environment()
counter = simpy.Resource(env, capacity=1)
env.process(source(env, df.head(), counter))
env.run()
simpy.util 中有一个start_delayed函数,可能适合您的需求。
import random
import simpy
from simpy.util import start_delayed
import pandas as pd
def source(env, df, counter):
for i, row in df.iterrows():
c = client(env, 'Client%02d' % i, counter, row,time_in_bank=row["service_duration"])
# Some code to format timestamp to seconds
delay = timestamp_to_seconds(row["arrival_time"])
start_delayed(env, c, delay)
def client(env, name, counter, row, time_in_bank):
arrive = env.now # probably some changes to be done here
print('%s arrived at %7.4f' % (name,arrive))
with counter.request() as req:
results = yield req
wait = env.now - row["waiting_time"]
print('%s waited %6.3f' % (name, wait))
yield env.timeout(time_in_bank)
print('%s exited the office at %7.4f' % (name, env.now))
df = pd.read_csv("arrivals.csv",sep=",",header=0)
env = simpy.Environment()
counter = simpy.Resource(env, capacity=1)
env.process(source(env, df.head(), counter))
env.run()