Posts Tagged ‘programming code’

How to check Apache Webserver and MySQL server uptime – Check uptime of a running daemon with PS (process) command

Tuesday, March 10th, 2015

check_Apache_Webserver_and_MySQL_server_uptime_-_Check-uptime-of-running-daemon-service-with-PS-process-command

Something very useful that most Apache LAMP (Linux Apache MySQL PHP) admins should know is how to check Apache Webserver uptime and MySQL server running (uptime).
Checking Apache / MySQL uptime is primary useful for scripting purposes – creating auto Apache / MySQL service restart scripts, or just as a quick console way to check what is the status and uptime of Webserver / SQL.

My experience as a sysadmin shows that lack of Periodic Apache and MySQL restart every week or every month often creates sys-admin a lot of a headaches cause (Apache / NGINX / SQL  server) starts eating too much memory or under some circumstances leads to service or system crashes. Periodic system main services restart is especially helpful in case if Website's backend programming code is writetn in a bad and buggy uneffient way by unprofessional (novice) programmers.
While I was still working as Senior SysAdmin in Design.BG, I've encountered many such Crappy Web applications developed by dozen of different programmers (because company's programmers changed too frequently and many of the hired Web Developers ,were still learning to program, I guess same is true also for other Start-UP Web / IT Company where crappy programming code is developed you will certainly need to keep an eye on Apache / MYSQL uptime.  If that's the case below 2 quick one liners with PS command will help you keep an eye on Apache / MYSQL uptime

 

ps -eo "%U %c %t"| grep apache2 | grep -v grep|grep root
root     apache2            02:30:05

Note that above example is Debian specific on RPM based distributions you will have to grep for httpd instead of apache2
 

ps -eo "%U %c %t"| grep http| grep -v grep|grep root

root     apache2            10:30:05

To check MySQL uptine:
 

ps -eo "%U %c %t"| grep mysqld
root     mysqld_safe        20:42:53
mysql    mysqld             20:42:53


Though example is for mysql and Apache you can easily use ps cmd in same way to check any other Linux service uptime such as Java / Qmail / PostgreSQL / Postfix etc.
 

ps -eo "%U %c %t"|grep qmail
qmails   qmail-send      19-01:10:48
qmaill   multilog        19-01:10:48
qmaill   multilog        19-01:10:48
qmaill   multilog        19-01:10:48
root     qmail-lspawn    19-01:10:48
qmailr   qmail-rspawn    19-01:10:48
qmailq   qmail-clean     19-01:10:48
qmails   qmail-todo      19-01:10:48
qmailq   qmail-clean     19-01:10:48
qmaill   multilog        40-18:02:53

 

 ps -eo "%U %c %t"|grep -i nginx|grep -v root|uniq
nobody   nginx           55-01:22:44

 

ps -eo "%U %c %t"|grep -i java|grep -v root |uniq
hipo   java            27-22:02:07

 

What is the real development costs of Debian GNU / Linux – How much costs the development of a Free Software projects

Friday, February 17th, 2012

Free Software (FS) is free as in freedom as well as free as in price. Free and Open Source Software (FOSS) is developed by geek hobbyist which voluntarily put their time and effort in writting, testing and sharing with anyone for free million of lines of programming code. This doesn't mean however the price of free software costs is 0 (zero). Though the "end product" –  Free Software developed is FREE, "real" software costs as with any other product costs huge money.

I've recently read on Jeb's blog an estimation on how much is the cost of one of the major Free Software project efforts – Debian GNU / Linux
According to James E. Brombergerthe whole Debian project was estimated to be at the shocking price of $19 billion – $19 000, 000, 000 !!!

Here is how JEB got the $19 billions, a quote taken from his blog:

"By using David A Wheeler’s sloccount tool and average wage of a developer of US$72,533 (using median estimates from Salary.com and PayScale.com for 2011) I summed the individual results to find a total of 419,776,604 source lines of code for the ‘pristine’ upstream sources, in 31 programming languages — including 429 lines of Cobol and 1933 lines of Modula3!

In my analysis the projected cost of producing Debian Wheezy in February 2012 is US$19,070,177,727 (AU$17.7B, EUR€14.4B, GBP£12.11B), making each package’s upstream source code worth an average of US$1,112,547.56 (AU$837K) to produce. Impressively, this is all free (of cost).

James has done incredible job with this great research and he deserves applause.
However I believe the numbers proposed by his research are slightly different if we speak about realistic cost of Debian GNU / Linux.
The real costs of the working software ready to install on a user PC are way higher, as according to Jeb's research only the software cost based on code line count is considered.

Hence James software estimation calculates only the programming costs and miss many, many factors that constitute the software end cost.
Some of the many, many REAL COST / expenses for developing a huge Free Software project like Debian GNU / Linux to be considered are:
 

a) bandwidth costs for hosting free software (on the server side)b) bandwidth cost for developers or FS users downloading the software

a) Time spend to spread the word of the great added value of Debian and bundled software (Mouth by Mouth Marketing)

b) Time spend to advertise Debian and its free software components on blogs, social networks (identi.ca, facebook, twitter) etc.(Voluntary online Marketing, SEO etc.)

c) Time spend on generating ideas on future program versions and reporting them to Debian FS community

d) Time on evaluation and feedback on software

e) Time spend on managing free software repository (download) servers voluntarily (by system administrators)

f) Time spend by users on Bug Tracking & Bug Reporting

g) Time spend on research and self-actualization by software developer)

h) Time spend on software Quality Assurance

This are most of the multiple factors which should probably influence the cost of any non-free (proprietary software) project. No matter this costs apply for non-free software, it perfectly applies for free software as well.With all said if if we assume the non-programming costs are equal to the programming costs of $ 19 000 000 000 (suggested by Jeb). This means the real cost of Debian will presumably be at least $32 000 000 000. Putting $ 19 billion for all this long list of "additional" costs (besides pure source) factors is probably still very under-scored number.
 

  • the developers use of their own computers (hardware depreciation)
  • electricity bill of the volunteer (developer) working on the program or project
  • electricity bills for servers where free software is stored and available for download
  • volunteer developer IT skills and tech knowledge (KNOW HOW)
  • Internet, network, dial up bandwidth cost
  • personal time put in FS development (programming, design, creativity etc.)! here the sub costs are long:
  • Costs for Project Management Leaders / Project Coordination
  • The complexity of each of the projects constituting Debian

Very interesting figure from Jeb's research is the Programming Languages break down by source code figure.
Jamesresearch reveals on the 4 major programming languages used in the 17000+ software projects (part of Debian GNU / Linux):

 

  • ANSI C with 168,536,758 – (40% of all projects source code)
  • C++ at 83,187,329 – (20% of all projects source)
  • Java 34,698,990 – (lines of code 8% of sources)
  • Lisp – (7% of all projects source code)

  His research also provides a general idea on how much the source code of some of the major FOSS projects costs. Here is a copy of his figures
 

Individual Projects

Other highlights by project included:

ProjectVersionThousands
of SLOC
Projected cost
at US$72,533/developer/year
Samba3.6.12,000US$101 (AU$93M)
Apache2.2.9693US$33.5M (AU$31M)
MySQL5.5.171,200US$64.2M (AU$59.7M)
Perl5.14.2669US$32.3M (AU$30M)
PHP5.3.9693US$33.5M (AU$31.1M)
Bind9.7.3319US$14.8M (AU$13.8M)
Moodle1.9.9396US$18.6M (AU$17.3M)
Dasher4.11109US$4.8M (AU$4.4M)
DVSwitch0.8.3.66US$250K (AU$232K)

 

As you can imagine all the source evaluation results, are highly biased and are open for discussion, since evaluating a free software project/s is a hard not to say impossible task. The "open" model of development makes a project very hard to track, open source model implies too many unexpected variables missing from the equation for clear calculation on costs. What is sure however if turned in money it is very expensive to produce.  At present moment Debian Project is sponsored only through donations. The usual yearly budget 5 years ago for Debian  was only $80 000 dollars a year!! You can check Debian Project annual reports throughout the years here , for year 2012 Debian Project budget is as low as $ 222, 677 (US Dollars)! The output price of the software the project provides is enormous high if compared to the low project expenses!

For us the free software users, price is not a concern, Debian is absolutely free both  as in freedom and free as in beer 😉