21st March 2013
In Phoronix Forum I have received feedback regarding the CPU time issue, as described below, see "CPU Usage Time Is Dependant on Load". Right now I use
3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
So maybe this behaviour is kernel dependant.…
13th March 2013
Press On/Off switch (right) and simultaneously press speaker volume button (left), voila, you've got your screenshot in Android.
Here is an example from today.
13th March 2013
8th March 2013
It is easy to download received e-mail from GMail. It is not obvious how to download ones own sent mail. To do this you have to "Enable POP for all mail (even mail that's already been downloaded)" in the Setting's area, see picture below.
5th March 2013
Yesterday Fon and Deutsche Telekom announced that Deutsche Telekom wants to partner with Fon. Fon already partnered with British Telecom, with Portuguese Zon, with Belgian Belgacom, French SFR, Croatian (Deutsche) Telekom, and others. Fon already partnered with E-Plus in Germany. But this…
5th March 2013
NVidia CEO Jen-Hsun Huang speaks on GTC (GPU Technology Conference (dead link)) 2012 on key differences between Fermi and Kepler. Key differences are
SMX: Streaming Multiprocessor neXt generation
Hyper-Q: keep GPU busy with queuing
Dynamic Parallelism: GPU can now assign work to itself, e.g., run…
27th February 2013
Here are some thoughts about possible enhancements for J-Pilot.
Convert pdb's and pc3's to SQLite. This makes it easier to analyze data according some criteria, e.g., find how many addresses have the same telephone numbers, how many entries in datebook contain the same substring, etc.
24th February 2013
My mother uses Xubuntu, i.e., she uses Xfce. She uses a German keyboard, but wants to write e-mails with spanish accents, i.e., she needs dead keys. At first I tried to solve the problem with a change in xorg.conf, which did not work. Some Google search revealed that a couple of people had the same…
17th February 2013
There is a lesser known command, jpilot-dump, to print portions of J-Pilot files.
Here is an example to print category, first name, last name:
jpilot-dump -A +A"%C %f %l" | less
And here is another command: jpilot-merge.
12th February 2013
Recently I installed an additional SATA drive on my Lenovo laptop. Without much ado I formatted the drive to ext4. Unfortunately, I quickly realized that the hard drive is spinning almost twice a second. My first drive on the laptop is also formatted with ext4, so using ext4 was a natural choice. A…
29th January 2013
I wanted to see what files and when J-Pilot accesses its pdb and pc3 files. In my case strace produces much more output than actually needed. But inotifywait shows what and when files are accessed.
inotifywait -m .jpilot/
inotifywait is in Debian/Ubuntu package inotify-tools.
Here is an example of…
11th January 2013
My other son had a practical training at Fraunhofer IGD. He wrote an OpenGL/C++ program in Windows where one views the earth rotating around the sun, thereby with its rotating moon, see picture below.
I ported this program to Gtk/Linux. You'll find the code in openglSunEM.c. The link…
10th January 2013
A couple of years ago I went through Otto Forster's Analysis 3 book for self study of differential forms. I thought the presentation could be leaned more towards matrices and determinants, which since Bourbaki's time got a difficult stand in mathematics.
Here is the document: On Differential…
9th January 2013
Very inspirational and motivating speech held by Dean Kamen:
8th January 2013
Since using Alpenfoehn Gotthard CPU cooling has improved and the whole PC is more silent. On an otherwise idle PC, just xterm and Chrome running:
$ modprobe it87
avg-cpu: %user %nice %system %iowait %steal %idle
1.25 0.00 0.25 0.17 0.00 98.33
. . .
7th January 2013
I was asked by a colleague of mine how many combinations are possible for the German tax id. The German tax id is built entirely from eleven digits. Its specification is given in Pruefziffernberechnung, see Steueridentifikationsnummer in the German Wikipedia. Every person reported to live in…
6th January 2013
According the Bloomberg interview as of March 28, 2011, with Matt Mullenweg, https://wordpress.tv/2011/03/28/bloomberg-mullenweg/, it costs 300-400.000$ per month to maintain 1.300 servers operating WordPress.
29th December 2012
I wanted to write a short benchmark for my son to demonstrate that the AMD Bulldozer 8 core CPU is better than a 6 core CPU from AMD when computing with integers. So I wrote a short C program to compute a recurrence relation using integers only, see C code below. When I ran this program on one…
2nd January 2008
Mein erster Eindruck von WordPress ist sehr gut. Die Schrift ist angenehm groß, die Bedienung einfach.
2nd January 2008
Welcome to WordPress.com. This is your first post. Edit or delete it and start blogging!