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by Volker Dirr
Fri Aug 23, 2019 5:21 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

The Pi 4 was tested with gcc 8.3 The Pi 3 and 3+ were tested with gcc 6.3. I can't remember the gcc versions of Pi 1 and 2. I am too busy at the moment to repeat the test for Pi 1 to 3 with latest gcc. Yes, they might be a bit faster; but the values look "more impressive" if is a bit "cheated" like ...
by Volker Dirr
Wed Aug 21, 2019 6:11 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

Old topic, but i think still not out of date; because schools still need to do their timetables. I also done the benchmark with a 3+ some time ago and also with a Pi 4 today. Results: 4min 36s - Broadcom BCM2711, Raspberry Pi 4, ARM Cortex-A72, 1.5 GHz, Raspbian, Volker Dirr 7min 45s - Broadcom BCM2...
by Volker Dirr
Wed Mar 16, 2016 9:26 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

Pentium M 1600 is also over 12 years old. A bit unfait comparison. My first laptop was also a Pentium M 1600. It had 1,6 GHz only if it was connect to a socket. With battery it slowed down to 1.2 Ghz. I runned the benchmark also with that computer ~6 years ago. The bad stuff was, that the benchmark ...
by Volker Dirr
Wed Mar 16, 2016 8:24 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

Oh. Sorry. I didn't repeated it:
use = school timetabling (with FET)
which x86 = see the link in the previous mail. there is a list of some CPUs. So you can compare it.
compared with an 12 years old pentium 4 the new pi 3 is ~30% slower.
by Volker Dirr
Wed Mar 16, 2016 8:01 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

I done a benchmark with the Pi 3. Very impressive, since i didn't expect that it is nearly 2 times faster then the Pi 2. Still slower then x86 CPU, but the perfomance might be good enough for many schools now. I hope Pi 4 will have a similar speedup next year :-) Full results are visible in the firs...
by Volker Dirr
Fri Apr 10, 2015 8:53 am
Forum: General discussion
Topic: MPEG2 Patent expires this month
Replies: 19
Views: 9376

MPEG2 Patent expires this month

I read that the MPEG2 patent expires April 27, 2015.
See:
http://www.mpegla.com/main/programs/m2/ ... 2-att1.pdf

So the MPEG2 key in the store will be free soon?!
by Volker Dirr
Wed Apr 01, 2015 12:32 pm
Forum: General discussion
Topic: Is the Pi Store down?
Replies: 16
Views: 4586

Re: Is the Pi Store down?

I wrote to IndieCity so far only. But no response.
I didn't wrote to RPF.
Maybe i just have got to less experience - as you can see i wrote only a few posts yet.
I don't think RPF will listen to a rookie with a drastic suggestion.
by Volker Dirr
Wed Apr 01, 2015 10:09 am
Forum: General discussion
Topic: Is the Pi Store down?
Replies: 16
Views: 4586

Re: Is the Pi Store down?

In my opinion it look like an intermittent "bug" that you are still able to update. Why? A lot of reasons: - The GUI of the store is bad. Missing pictures, bad style, ... - There are missing basic features like deleting an app (and this was requested already years ago) - I still can't download my ap...
by Volker Dirr
Tue Mar 31, 2015 11:25 am
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

I done a benchmark with the Pi 2. It is around 4 times faster then the Pi 1, but still slower then x86 CPUs. (see http://lalescu.ro/liviu/fet/forum/index.php?topic=166.0 )
by Volker Dirr
Sat Feb 21, 2015 11:33 am
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

Liviu (main author) and me tried several algorithms. Genetic, Graph colouring, ... But the quickest and most flexible (if you want to add new constraints) we found so far is the current algorithm (Liviu found it). You can read more about it here: http://lalescu.ro/liviu/fet/forum/index.php?topic=444...
by Volker Dirr
Fri Feb 20, 2015 2:30 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

Re: School timetabling with Pi. Benchmark Pi vs x86

Ohh... Sorry. My bug. Your are right. Please strike the word "other". About other ARM: I sadly haven't got other ARM CPU at the moment. (ok, i have got one in my smart-phone, but i am currently not clever enough to compile on my smart-phone and i am also not clever enough to cross-compile. I can't f...
by Volker Dirr
Wed Feb 18, 2015 6:42 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 16
Views: 4746

School timetabling with Pi. Benchmark Pi vs x86

Dear moderators, please check carefully this topic (and links). It might include to much advertising. Please don't publish it if it doesn't fit your rules. Hallo Pi fans, my name is Volker. I am co-author of FET timetabling software. (see http://lalescu.ro/liviu/fet/ ) I like the PI pretty much. Eve...

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