[CentralOH] 2015-09-18 道場 Scribbles 落書/惡文? growler halwani whitehurst teaching pulse oximeter syslog inotify EULA mutex mkdir lockd nqs Al Gore The Donald TAoCP APUE reentrancy

Sat Sep 19 23:37:36 CEST 2015

Someone brought wild pawpaws that they had gotten on their way to the dojo
and gave some away (again!).

growler micro web-framework
https://pypi.python.org/pypi/growler/
wp:Beer_bottle#Growler
The Ohio Taproom http://theohiotaproom.com/
where pizza crawl begins
2015-10-01 19:00-21:00 (Thursday) (kinda) Grandview Pizza Crawl
http://www.columbusunderground.com/forums/topic/5xnw-pizza-crawl-2015

    Grandad's
    Halwani Cuisine
    Z-Pizza
    Dewey's
    Bono Pizza
    Mama Mimi's

wp: prefix means Wikipedia
To get good answers, consider following the advice in the links below.
http://catb.org/~esr/faqs/smart-questions.html
http://web.archive.org/web/20090627155454/www.greenend.org.uk/rjk/2000/06/14/quoting.html

The Linux Setup - Jim Whitehurst, President/CEO, Red Hat
http://www.mylinuxrig.com/post/129154618674/the-linux-setup-jim-whitehurst-presidentceo

14 tips for teaching open source development
http://opensource.com/education/15/9/teaching-open-source-development-undergraduates

Pawpaw season seems later this year than usual.
There were reports of plenty of pawpaws collected 2015-09-16.

Chap releases Python and Smalltalk-inspired language, complete with shrubbery
http://www.theregister.co.uk/2015/09/18/we_are_the_knights_who_code_ni/

Someone who wants to develop a smartphone app should periodically check out
http://www.meetup.com/techlifecolumbus/events/.
There was an event listed for yesterday.
http://www.meetup.com/techlifecolumbus/events/225182103/
Also check out the following URL periodically.
http://www.meetup.com/GDG-Columbus/events/

http://www.meetup.com/Codecademy-Columbus/

logging: syslog is the way to go
use logger command with level? and tag? arguments.
logger adds timestamps for free

Does systemd replace or screw up syslog?

inotify (linux only) will give you events as you prefer to receive them

Man Finds $1,000 Prize in EULA
http://www.pcpitstop.com/spycheck/eula.asp
http://www.yro.slashdot.org/story/05/02/23/2315211/man-finds-1000-prize-in-eula

mkdir is handy for implementing locks (mutexes).
Use with a wrapper, so that if code that does the interesting work crashes and
so does not get to remove the lock, that the wrapper will catch the crash and
remove the lock. Only the wrapper creates and removes the lock.
http://mywiki.wooledge.org/BashFAQ/045

Avoid more and more Sorcerer's apprentices bringing more and more buckets of
water.
???
To allow up to only n of something, use -x n arguments to mktemp?
(I am missing something here. Does not match man page I read on *buntu.)
Using pid as part of name can be convenient.
-d make a directory instead of a file
--tempdir[=DIR] where to make file or directory

wp:Banker's algorithm

But mkdir is not atomic with various remote filesystems.
I.e., the operating system makes it atomic only if on local filesystem.
To get a lock for multiple computers, have them request lock on one computer,
which does the mkdir thing only on its own local filesystem (albeit on behalf
of multiple remote computers).

This has been solved. See lockd.

Civil war messenger problem:
How does one know that all of ones forces know to attack at the same time?
message queue

debugging: binary partitioning: divide and conquer

nqs: network queueing server
http://gnqs.sourceforge.net/docs/papers/mnqs_papers/original_cosmic_nqs_paper.ht

More important than his invention of the internet
is Al Gore's invention of techniques, named after himself: algorithms![1]
Is not just about his mannerisms.
wp:eponym

MIT algorithms
wp:Introduction to Algorithms
aka CLR(S)
not CSN(Y)
https://mitpress.mit.edu/index.php?q=books/introduction-algorithms
SUNY algorithms
Skiena's Algorithms Lectures
http://www3.cs.stonybrook.edu/~algorith/video-lectures/
The Stony Brook Algorithm Repository
http://www3.cs.stonybrook.edu/~algorith/
The Algorithm Design Manual 2nd Edition by Steven S. Skiena

Some folks are far far beyond me. The Donald is far far beyond me.
It takes more to write something than to read and understand it.
I struggle to understand what his writings.
wp:TAoCP

wp:Johnson's algorithm
wp:Job shop scheduling
wp:Job_Shop_Scheduling#Johnson.27s_algorithm
http://www.rspq.org/pubs/j2.pdf
Optimal Two- and Three-Stage Production Schedules With Set-up Time Invluded
S. M. Johnson
The Rand Corporation
wp:RAND Corporation
wp:Ayn Rand
not wp:Stephen C. Johnson
"Using TSO is like kicking a dead whale down the beach"
wp:Exploding whale
wp:Globster
wp:glob (programming)
wp:regex
wp:PCRE

wp:select (Unix)
wp:APUE
Thank you W. Richard Stevens for writing so well.

wp:Reentrancy (computing)
wp:Reentrant mutex

Pawpaw
In Search of America’s Forgotten Fruit
by Andrew Moore
http://www.chelseagreen.com/pawpaw

http://mywiki.wooledge.org/ProcessManagement#How_do_I_make_sure_only_one_copy_of_my_script_can_run_at_a_time.3F

[1] too bad it's not 04-01: wp:Algorithm#Word_origin