mon process via pid file

#!/usr/bin/python3.2 import os self_pid_path = '/var/run/monPid.pid' pid_path_list = ['/var/run/mldonkey.pid', '/var/run/sshd.pid'] # olny a instance run def check_pid(pid): """ Check For the existence of a unix pid. """ try: os.kill(pid, 0) except OSError: return False else: return True pid_file=None if os.path.exists(self_pid_path): with open(self_pid_path, 'r') as oldpid_file: pid = oldpid_file.readline() if pid.isdigit() and check_pid(int(pid)): exit() else: pid_file = open(self_pid_path, 'w') else: pid_file = open(self_pid_path, 'a') pid_file.write(str(os.getpid())) pid_file.close() # olny a instance run # detect mldonkey alive by pid file for pid_path in pid_path_list: pid = 0 program = pid_path[pid_path.rfind('/')+1:-4] if os.path.exists(pid_path): with open(pid_path, 'r') as pid_file: pid = pid_file.readline()[:-1] if pid.isdigit() and check_pid(int(pid)): print (program + ': alive') continue else: pid = '' if pid.isdigit() and check_pid(int(pid)): print (program + '(' + pid + ')' + 'alive') else: print (program + '(' + pid + ')' + 'dead') os.system('echo `date +"%a %b %d %T"` /etc/init.d/' + program + ' restart >> /var/log/monPidFile')

crontab -e * * * * * /sbin/monPidFile

七二法則

七二法則是用於計算在某段時間之內成長到原有價值兩倍的方法。

倍數成長年限＝７２／成長率

真是這麼神奇？

Code:

import math print (('%5s %5s %5s') % ('%', '72/I', 'Actual Year')) for i in range(1, 101): actual = 0 j = 1 k = 1+i/100 while j < 2: j *=k actual += 1 print (('%5d %5d %5d') % (i, math.floor(72/i), actual))

Result:

% 72/I Actual Year 1 72 70 2 36 36 3 24 24 4 18 18 5 14 15 6 12 12 7 10 11 8 9 10 9 8 9 10 7 8 11 6 7 12 6 7 13 5 6 14 5 6 15 4 5 16 4 5 17 4 5 18 4 5 19 3 4 20 3 4 21 3 4 22 3 4 23 3 4 24 3 4 25 2 4 26 2 3 27 2 3 28 2 3 29 2 3 30 2 3 31 2 3 32 2 3 33 2 3 34 2 3 35 2 3 36 2 3 37 1 3 38 1 3 39 1 3 40 1 3 41 1 3 42 1 2 43 1 2 44 1 2 45 1 2 46 1 2 47 1 2 48 1 2 49 1 2 50 1 2 51 1 2 52 1 2 53 1 2 54 1 2 55 1 2 56 1 2 57 1 2 58 1 2 59 1 2 60 1 2 61 1 2 62 1 2 63 1 2 64 1 2 65 1 2 66 1 2 67 1 2 68 1 2 69 1 2 70 1 2 71 1 2 72 1 2 73 0 2 74 0 2 75 0 2 76 0 2 77 0 2 78 0 2 79 0 2 80 0 2 81 0 2 82 0 2 83 0 2 84 0 2 85 0 2 86 0 2 87 0 2 88 0 2 89 0 2 90 0 2 91 0 2 92 0 2 93 0 2 94 0 2 95 0 2 96 0 2 97 0 2 98 0 2 99 0 2

結論：

成長率在６或以下就準確，在７到３６需要加１

Save power through dynamic frequency

the program split in 2 part:
a program set something and call the script to manage the frequency

/etc/local.d/powerSave.start

#!/bin/bash #Runtime Power Management for i in `find /sys/devices/*/power/control`; do echo auto > $i; done; #USB Autosuspend for i in `find /sys/bus/usb/devices/*/power/level`; do echo auto > $i; done; for i in `find /sys/bus/usb/devices/*/power/autosuspend`; do echo 2 > $i; done; #Use script to mgmt the frequency cpufreq-set -r -g userspace echo `date +"%a %b %d %T"` dynamicFrequency start >> /var/log/dynamicFrequency.log /sbin/dynamicFrequency.py

/etc/local.d/powerSave.stop

#!/bin/bash kill $(cat /var/run/dynamicFrequency.pid) cpufreq-set -r -g performance echo `date +"%a %b %d %T"` dynamicFrequency Stop >> /var/log/dynamicFrequency.log

/sbin/dynamicFrequency.py

#!/usr/bin/python3.2 """\ This program select a scaling available frequencies based on loadavg for example the available frequencies: 350000 700000 1050000 1400000 1750000 2100000 2450000 2800000 the current frequencies is 175000 if load >= 80% the frequencies jump 2 step (245000) if load >= 60% the frequencies jump 1 step (210000) if load < 20% the frequencies jump -2 step (1050000) if load < 40% the frequencies jump -1 step (1400000) """ import os # Write the pid into pid_path = '/var/run/dynamicFrequency.pid' pidFile=None if os.path.exists(pid_path): pidFile = open(pid_path, 'w') else: pidFile = open(pid_path, 'a') pidFile.write(str(os.getpid())) pidFile.close() scaling_available_frequencies = None with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies', 'r') as file: scaling_available_frequencies = file.read().strip().split() current_frequencies = None with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq', 'r') as file: raw_current_frequencies = file.read().strip() if raw_current_frequencies in scaling_available_frequencies: current_frequencies = scaling_available_frequencies.index(raw_current_frequencies) else: current_frequencies = len(scaling_available_frequencies) from decimal import * from time import sleep max = len(scaling_available_frequencies) - 1 while True: loadavg = None with open('/proc/loadavg', 'r') as file: loadavg = Decimal(file.read().strip()[0]) change = 0 if loadavg >= Decimal(0.80): change = 2 elif loadavg >= Decimal(0.60): change = 1 elif loadavg < Decimal(0.20): change = -2 elif loadavg < Decimal(0.40): change = -1 plan=None if current_frequencies + change >= max: plan = max elif current_frequencies + change < 0: plan = 0 else: plan = current_frequencies + change if plan != current_frequencies: current_frequencies = plan with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed', 'w') as file: file.write(scaling_available_frequencies[current_frequencies]) os.system('echo `date +"%a %b %d %T"` dynamicFrequency' + ' loadavg:' + str(loadavg) + ' change frequency to:' + \ scaling_available_frequencies[plan] + ' >> /var/log/dynamicFrequency.log') sleep(5)

Reference:

https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling

Calculate range number either prime number

import math
for n in range(2, 100):
 o = n
 s = set()
 i = 2
 j = math.floor(n)
 while i < j:
  if o % i == 0:
   s.add(i)
   o //= i
  else:
   i+=1
 if len(s):
  print(n, ':' ,','.join(str(v) for v in sorted(s)))
 else:
  print(n, ' is a prime number')

2 is a prime number 3 is a prime number 4 : 2 5 is a prime number 6 : 2,3 7 is a prime number 8 : 2 9 : 3 10 : 2,5 11 is a prime number 12 : 2,3 13 is a prime number 14 : 2,7 15 : 3,5 16 : 2 17 is a prime number 18 : 2,3 19 is a prime number 20 : 2,5 21 : 3,7 22 : 2,11 23 is a prime number 24 : 2,3 25 : 5 26 : 2,13 27 : 3 28 : 2,7 29 is a prime number 30 : 2,3,5 31 is a prime number 32 : 2 33 : 3,11 34 : 2,17 35 : 5,7 36 : 2,3 37 is a prime number 38 : 2,19 39 : 3,13 40 : 2,5 41 is a prime number 42 : 2,3,7 43 is a prime number 44 : 2,11 45 : 3,5 46 : 2,23 47 is a prime number 48 : 2,3 49 : 7 50 : 2,5 51 : 3,17 52 : 2,13 53 is a prime number 54 : 2,3 55 : 5,11 56 : 2,7 57 : 3,19 58 : 2,29 59 is a prime number 60 : 2,3,5 61 is a prime number 62 : 2,31 63 : 3,7 64 : 2 65 : 5,13 66 : 2,3,11 67 is a prime number 68 : 2,17 69 : 3,23 70 : 2,5,7 71 is a prime number 72 : 2,3 73 is a prime number 74 : 2,37 75 : 3,5 76 : 2,19 77 : 7,11 78 : 2,3,13 79 is a prime number 80 : 2,5 81 : 3 82 : 2,41 83 is a prime number 84 : 2,3,7 85 : 5,17 86 : 2,43 87 : 3,29 88 : 2,11 89 is a prime number 90 : 2,3,5 91 : 7,13 92 : 2,23 93 : 3,31 94 : 2,47 95 : 5,19 96 : 2,3 97 is a prime number 98 : 2,7 99 : 3,11