2012年4月30日 星期一

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

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2012年4月23日 星期一

Some install record concerning mod_wsgi on gentoo

Target: Using Virtual Server (I called it prototype :) ).

Request modify the hosts file

/etc/apache2/modules.d/70_mod_wsgi.conf

# WSGISocketPrefix is require 'mkdir /usr/lib/apache2/run'
WSGISocketPrefix 
#WSGIPythonOptimize enable output the pac file 
WSGIPythonOptimize 1
WSGILazyInitialization Off
#WSGIImportScript path process-group=prototype application-group=prototype
#WSGIPythonHome
#WSGIPythonPath


/etc/apache2/vhosts.d/00_default_vhost.conf

<VirtualHost *:80>
 ServerName prototype
 ErrorLog /var/log/apache2/prototype_error_log
 CustomLog /var/log/apache2/prototype_access_log common

 Include /etc/apache2/vhosts.d/prototype.include
 
        <IfModule mpm_peruser_module>
                ServerEnvironment apache apache 
        </IfModule>
</VirtualHost>



/etc/apache2/vhosts.d/prototype.include

ServerAdmin masked@masked
DocumentRoot "/var/www/prototype/htdocs"
<Directory "/var/www/prototype/htdocs">
# Enable AllowOverride in order to use '.htaccess' to modify the access right on the fly
 Options Indexes FollowSymLinks
 AllowOverride All
 Order allow,deny
 Allow from all
</Directory>
# Using Alias since mount the DocumentRoot as root "...any static files contained in the DocumentRoot will be hidden and requests against URLs pertaining to the static files will instead be processed by the WSGI application. from:http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide"

Alias /favicon.ico /var/www/prototype/htdocs/favicon.ico
Alias /media/ /var/www/prototype/htdocs/media/

WSGIScriptAlias / /var/www/prototype/htdocs/wsgi_script/runme.py
WSGIDaemonProcess prototype:1 processes=2 threads=15 display-name=%{GROUP} user=prototype group=prototype umask=0022 maximum-requests= 1024 deadlock-timeout=5 shutdown-timeout=3 receive-buffer-size=87380 send-buffer-size=65536
#-WSGIDaemonProcess  
WSGIProcessGroup prototype:1
WSGIRestrictProcess prototype:1


/var/www/prototype/htdocs/wsgi_script/runme.py

import sys

def application(environ, start_response):
    status = '200 OK'
    output = 'Hello World!'

    response_headers = [('Content-type', 'text/plain'),
                        ('Content-Length', str(len(output)))]
    start_response(status, response_headers)

    print >> sys.stderr, 'sys.prefix = %s' % repr(sys.prefix)
    print >> sys.stderr, 'sys.path = %s' % repr(sys.path)

    return [output]


All dir/.htaccess

AddDefaultCharset utf-8
# Disable directory index
Options -All
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Run Home bashrc

all below lines attached the file /etc/bash/bashrc

#enable personally bashrc
if [[ ~/.bashrc ]] ; then
    source ~/.bashrc
fi


Example 

#!/bin/bash
alias ncat='nano -v'
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Kick user/ terminal on linux

## show user
~# w
##
## kick terminal
~# skill -KILL -v pts/0
##
## kick user
~# skill -KILL -u user
##
## Stop/Pauseuser activites
~# skill -STOP -u user
##
## Resume a stopped user
~# skill -CONT -u user

http://servercomputing.blogspot.com/2012/01/kill-and-logout-users-in-pts-linux.html
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Enable key pad in termal

/etc/profile.d/term.sh 


#!/bin/bash
# This program change term to vt220 for enable num pad on terminal
# The side effect is the page up/down be unavailable in nano editor
# The default value is xterm
# list all available on /etc/terminfo
TERM=vt220


Refer:http://www.linuxquestions.org/questions/*bsd-17/problem-with-remote-terminal-ssh-and-putty-125363/
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The quicker way of run cmd with administrator rights

  1. Press Win Key
  2. Type cmd
  3. Combine to press Ctrl + Shift + Enter


Refer:http://fasterdata.es.net/host-tuning/ms-windows/

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2012年4月22日 星期日

Edit remote *nix text file on windows using Notepad++

Notepad++ with the useful plugin - NppFtp
Step:
  1. Plugin->NppFtp->Show NppFtp windows
  2. On NppFtp windows, click 'Gear' (Settings) icon->Profile settings
  3. Add new a new profile, below is recommend settings
    Cache
    Local path:    %temp%\nppftp
    Ext path: /tmp/nppftp
    Transfers-
     Transfer mode
    Binary
Using Unix Document Format:
Either set default using Unix Document Format when create a new document (Settings, Preferences, New Document/Default Directory)
or set the current document to Unix format (Edit, EOL Conversion, Convert to Unix format)

When edit the python script file. Using UTF-8 without BOM. Rather than UTF8 and ANSI.

Refer:http://sourceforge.net/projects/notepad-plus/forums/forum/331754/topic/3498612

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2012年4月18日 星期三

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:
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2012年4月15日 星期日

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
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2012年4月13日 星期五

Use tty1 to see log

/etc/lilo.conf
add below line under the default. It mean use 800x600 (32bpp)
vga=0xF07



/sbin/tailLog
#!/bin/bash
#no blank screen
setterm -blank 0
# use bigger font
setfont /usr/share/consolefonts/UniCyr_8x14.psf.gz
tail -f /var/log/messages


modify the /etc/inittab

Edit the row:
c1:12345:respawn:/sbin/agetty 38400 tty1 linux

>
c1:12345:respawn:/sbin/agetty 38400 tty1 linux -n -l /sbin/tailLog
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Gentoo Network Configuration

/etc/conf.d/net
# This blank configuration will automatically use DHCP for any net.*
# scripts in /etc/init.d. To create a more complete configuration,
# please review /usr/share/doc/openrc*/net.example* and save your configuration
# in /etc/conf.d/net (this file :]!).
modules="ifconfig"
dns_servers_eth0="192.168.1.254"
config_eth0="192.168.1.234 netmask 255.255.255.0"
routes_eth0="default via 192.168.1.254"


/etc/sysctl.conf

#append this row
kernel.domainname = local


/etc/conf.d/hostname

# Set to the hostname of this machine
hostname="gentoo"
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Cannot mount boot partition (ext2)

Solution:
#tune2fs -O has_journal /dev/sda1
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lilo: One warning was issued

#/sbin/lilo -v
LILO version 22.8, Copyright (C) 1992-1998 Werner Almesberger
Development beyond version 21 Copyright (C) 1999-2006 John Coffman
Released 19-Feb-2007 and compiled at 09:05:22 on Apr 11 2012

Warning: LBA32 addressing assumed
Reading boot sector from /dev/sda
Using MENU secondary loader
Calling map_insert_data

Boot image: /boot/linux-3.2.1-gentoo-r2
Added gentoo

Boot image: /boot/linux-3.2.2-hardened-r1
Added hardened *
Writing boot sector.
/boot/boot.0800 exists - no boot sector backup copy made.
One warning was issued.

Try
#sbin/lilo -L -S /boot/boot.0800
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2012年4月9日 星期一

金句-白色相簿

6
忘卻煩惱得好辦法，對別人的麻煩插上一手如何？

11
占據胸口我煩惱，時間不會將其解決，只是貼上忘卻的標簽而已。
健忘，據說是替換成了更不能忘記的重要東西

14
音色無法調至完美，因為總能找到更好的
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