[英]Python script too much cpu usage
I'm not an expert in programming so i googled a lot to get this script to work. 我不是编程专家,因此我在Google上进行了大量搜索,以使该脚本可以正常工作。 It listens on the serial interface ans is searching for 3 values (temperature, humidity and battery level).
它在串行接口上侦听ans正在搜索3个值(温度,湿度和电池电量)。 If it finds one of zhem it saves it to a text file and checks if the value is above or under a certain level.
如果找到zhem之一,则将其保存到文本文件中,并检查该值是否在特定级别之上或之下。 I f this is the case it sends an e-mail to warn.
如果是这种情况,它将发送一封电子邮件进行警告。
My problem is that it uses constatntly about 99% of cpu power... Can you help me to limit the CPU usage to a minimum. 我的问题是,它会同时消耗约99%的cpu功率...您能帮我将CPU使用率限制到最低吗?
Thanks 谢谢
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import serial
import time
import sys
import smtplib
from time import sleep
def mail(kind, how, value, unit):
fromaddr = 'sender@domain.com'
toaddrs = 'recipient@domain.com'
msg = "\r\n".join([
"From: sender",
"To: recipient",
"Subject: Warning",
"",
"The " + str(kind) + " is too " + str(how) + ". It is " + str(value) + str(unit)
])
username = 'user'
password = 'password'
server = smtplib.SMTP('server:port')
server.ehlo()
server.starttls()
server.login(username,password)
server.sendmail(fromaddr, toaddrs, msg)
server.quit()
def main():
port = '/dev/ttyAMA0'
baud = 9600
ser = serial.Serial(port=port, baudrate=baud)
sleep(0.2)
while True:
while ser.inWaiting():
# read a single character
char = ser.read()
# check we have the start of a LLAP message
if char == 'a':
# start building the full llap message by adding the 'a' we have
llapMsg = 'a'
# read in the next 11 characters form the serial buffer
# into the llap message
llapMsg += ser.read(11)
if "TMPB" in llapMsg:
TMPB = llapMsg[7:]
with open("TMPB.txt", "w") as text_file:
text_file.write(TMPB)
if float(TMPB) >= 19:
mail("temperature", "high", TMPB, "°C")
elif float(TMPB) <= 15:
mail("temperature", "low", TMPB, "°C")
else:
pass
elif "HUMB" in llapMsg:
HUMB = llapMsg[7:]
with open("HUMB.txt", "w") as text_file:
text_file.write(HUMB)
if float(HUMB) >= 80:
mail("humidity", "high", HUMB, "%")
elif float(HUMB) <= 70:
mail("humidity", "low", HUMB, "%")
else:
pass
elif "BATT" in llapMsg:
BATT = llapMsg[7:11]
with open("BATT.txt", "w") as text_file:
text_file.write(BATT)
if float(BATT) < 1:
mail("battery level", "low", BATT, "V")
else:
pass
sleep(0.2)
if __name__ == "__main__":
main()
I solved the question myself. 我自己解决了这个问题。
The while ser.inWaiting():
loop was causing the heavy cpu load. 而
while ser.inWaiting():
循环造成了沉重的cpu负载。 I removed it and corrected the indentation and it works great with a few % cpu load. 我删除了它并纠正了缩进,它在cpu负载百分比很小的情况下也能很好地工作。
Thanks for your hints, it helped me solving the problem. 感谢您的提示,它帮助我解决了问题。
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