CPU hotplugging

http://en.kioskea.net/faq/616-multicore-cpu-how-to-disable-a-core

During boot,

add maxcpus=X in the kernel command line

Without reboot,
(From http://www.cyberciti.biz/faq/debian-rhel-centos-redhat-suse-hotplug-cpu/)

# cd /sys/devices/system/cpu
# ls -l

# echo 0 > /sys/devices/system/cpu/cpu6/online
# grep “processor” /proc/cpuinfo

# echo 1 > /sys/devices/system/cpu/cpu6/online
# grep “processor” /proc/cpuinfo

Students SAT score is proportional to house income!?

http://www.danpink.com/archives/2012/02/how-to-predict-a-students-sat-score-look-at-the-parents-tax-return

dpkg cheat sheet

http://www.cyberciti.biz/howto/question/linux/dpkg-cheat-sheet.php

The ones I always forget:

Files per package:
dpkg -S /bin/netstat

Files of a non installed package:
dpkg -c dc_1.06-19_i386.deb

Files of an installed package:
dpkg -L perl

Arduino history – documentary

http://vimeo.com/18539129

Drive (Daniel Pink)

http://www.ted.com/talks/dan_pink_on_motivation.html

Scale of the Universe 2012

Very nice:
http://www.onemorelevel.com/game/scale_of_the_universe_2012

The Software Stack and Latency

http://antirobotrobot.tumblr.com/post/17138289530/the-software-stack-and-latency