X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/b5d23d92b95cb70f05c792ca742a2f411a593335..a77c98a4e5c8c043ad9f17f6bd050029dec1a6fc:/blog/index.html diff --git a/blog/index.html b/blog/index.html index 58bf2bbc70..01456ee1cf 100644 --- a/blog/index.html +++ b/blog/index.html @@ -19,6 +19,150 @@ +
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Debian Edu interview: Justin B. Rye
+
8th April 2012
+

It take all kind of contributions to create a Linux distribution +like Debian Edu / Skolelinux, +and this time I lend the ear to Justin B. Rye, who is listed as a big +contributor to the +Debian +Edu Squeeze release manual. + +

Who are you, and how do you spend your days?

+ +

I'm a 44-year-old linguistics graduate living in Edinburgh who has +occasionally been employed as a sysadmin.

+ +

How did you get in contact with the Skolelinux/Debian Edu +project?

+ +

I'm neither a developer nor a Skolelinux/Debian Edu user! The only +reason my name's in the credits for the documentation is that I hang +around on debian-l10n-english waiting for people to mention things +they'd like a native English speaker to proofread... So I did a sweep +through the wiki for typos and Norglish and inconsistent spellings of +"localisation".

+ +

What do you see as the advantages of Skolelinux/Debian +Edu?

+ +

What do you see as the disadvantages of Skolelinux/Debian +Edu?

+ +

These questions are too hard for me - I don't use it! In fact I +had hardly any contact with I.T. until long after I'd got out of the +education system.

+ +

I can tell you the advantages of Debian for me though: it soaks up +as much of my free time as I want and no more, and lets me do +everything I want a computer for without ever forcing me to spend +money on the latest hardware.

+ +

Which free software do you use daily?

+ +

I've been using Debian since Rex; popularity-contest says the +software that I use most is xinit, xterm, and xulrunner (in other +words, I use a distinctly retro sort of desktop).

+ +

Which strategy do you believe is the right one to use to +get schools to use free software?

+ +

Well, I don't know. I suppose I'd be inclined to try reasoning +with the people who make the decisions, but obviously if that worked +you would hardly need a strategy.

+
+
+ + + Tags: debian edu, english, intervju. + + +
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+ +
+
Why the KDE menu is slow when /usr/ is NFS mounted - and a workaround
+
6th April 2012
+

Recently I have spent time with +Skolelinux Drift AS on speeding +up a Debian Edu / Skolelinux +Lenny installation using LTSP diskless workstations, and in the +process I discovered something very surprising. The reason the KDE +menu was responding slow when using it for the first time, was mostly +due to the way KDE find application icons. I discovered that showing +the Multimedia menu would cause more than 20 000 IP packages to be +passed between the LTSP client and the NFS server. Most of these were + +NFS LOOKUP calls, resulting in a NFS3ERR_NOENT response. Because the +ping times between the client and the server were in the range 2-20 +ms, the menus would be very slow. Looking at the strace of kicker in +Lenny (or plasma-desktop i Squeeze - same problem there), I see that +the source of these NFS calls are access(2) system calls for +non-existing files. KDE can do hundreds of access(2) calls to find +one icon file. In my example, just finding the mplayer icon required +around 230 access(2) calls.

+ +

The KDE code seem to search for icons using a list of icon +directories, and the list of possible directories is large. In +(almost) each directory, it look for files ending in .png, .svgz, .svg +and .xpm. The result is a very slow KDE menu when /usr/ is NFS +mounted. Showing a single sub menu may result in thousands of NFS +requests. I am not the first one to discover this. I found a +KDE bug report +from 2009 about this problem, and it is still unsolved.

+ +

My solution to speed up the KDE menu was to create a package +kde-icon-cache that upon installation will look at all .desktop files +used to generate the KDE menu, find their icons, search the icon paths +for the file that KDE will end up finding at run time, and copying the +icon file to /var/lib/kde-icon-cache/. Finally, I add symlinks to +these icon files in one of the first directories where KDE will look +for them. This cut down the number of file accesses required to find +one icon from several hundred to less than 5, and make the KDE menu +almost instantaneous. I'm not quite sure where to make the package +publicly available, so for now it is only available on request.

+ +

The bug report mention that this do not only affect the KDE menu +and icon handling, but also the login process. Not quite sure how to +speed up that part without replacing NFS with for example NBD, and +that is not really an option at the moment.

+ +

If you got feedback on this issue, please let us know on debian-edu +(at) lists.debian.org.

+
+
+ + + Tags: debian edu, english. + + +
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+ +
+
Debian Edu in the Linux Weekly News
+
5th April 2012
+

About two weeks ago, I was interviewed via email about +Debian Edu and Skolelinux by +Bruce Byfield in Linux Weekly News. The result was made public for +non-subscribers today. I am pleased to see liked our Linux solution +for schools. Check out his article +Debian Edu/Skolelinux: A +distribution for education if you want to learn more.

+
+
+ + + Tags: debian edu, english. + + +
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Debian Edu interview: Wolfgang Schweer
1st April 2012
@@ -512,175 +656,6 @@ Trond Mæhlum for innspill om skoler med Linux.

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Debian Edu interview: John Ingleby
-
19th March 2012
-

Debian Edu / Skolelinux -users are spread all across the globe. The second inteview after -the -Squeeze release was publised is with John Ingleby, a teacher and -long time Linux user in United Kingdom.

- -

Who are you, and how do you spend your days?

- -

I teach ICT part time at the Rudolf Steiner School in Kings -Langley, near London, UK. Previously I worked as a technical -author/trainer while my children attended the school, and I also -contributed to the Schoolforge UK community with the aim of -encouraging UK schools to adopt free/open source software. Five or six -years ago we had about 50 schools interested in some way, but we -weren't able to convert many of them into sustainable -installations.

- -

How did you get in contact with the Skolelinux/Debian Edu -project?

- -

Skolelinux had two representatives at an early Edubuntu meeting in -London which I attended. However at that time our school network had -just been installed using CentOS, LTSP 4 and GNOME. When LTSP 5 came -along we switched to Edubuntu thin client servers so now we have a -mixed environment which includes Windows PCs and student laptops, as -well as their MacBooks and iPads. However, the proprietary systems -have always been rather problematic, and we never built a GUI for the -LDAP server, so when I discovered Skolelinux is configured for all -these things we decided to try it.

- -

What do you see as the advantages of Skolelinux/Debian -Edu?

- -

By far the biggest advantage is the Debian Edu community. Apart -from that I have always believed in the same "sustainable computing" -goals that Skolelinux is built on: installing Linux on computers which -would otherwise be thrown away, to provide a reliable, secure and -low-cost IT environment for schools. From my own experience I know -that a part-time person can teach and manage a network of about 25 -Linux computers, but it would take much more of my time if we had -proprietary software everywhere.

- -

What do you see as the disadvantages of Skolelinux/Debian -Edu?

- -

As a newcomer I'm just finding out who's who in the community and -how you're organised, and what your procedures are for dealing with -various things such as editing manual pages and so-on. The only -English language mailing list seems to be for developers as well as -users, so my inbox needs heavy pruning each day!

- -

Which free software do you use daily?

- -

Besides the software already mentioned at school we use Samba, -OpenLDAP, CUPS, Nagios and Dansguardian for the network, and on the -desktops we have LibreOffice, Firefox, GIMP and Inkscape. At home I -use Ubuntu and an Android 4 eePad Transformer (but I'm not sure if -that counts...)

- -

Which strategy do you believe is the right one to use to -get schools to use free software?

- -

That's a tough question! For very many years UK schools installed -and taught only proprietary software, so that at the highest levels -the notion of "computer" means simply "proprietary office -applications". However, schools today are experiencing budget -constraints, and many are having to think hard about upgrading Windows -XP. At the same time, we have students showing teachers how to use -iPads, MacBooks and Android, so the choice of operating system is no -longer quite so automatic. What is more, our government at last -realised that we need people with programming skills, so they're -putting coding back in the curriculum! And it's encouraging that the -first 10,000 Raspberry Pi units sold out in 2 hours.

- -

I don't really know what strategy is going to get UK schools to use -free software, but building an active community of Skolelinux/Debian -Edu users in this country has to be part of it.

-
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- - - Tags: debian edu, english, intervju. - - -
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Writing and translating documentation in Debian Edu
-
16th March 2012
-

Documentation in Debian Edu is provided in several languages, and -it is important to make it both easy to contribute and to keep the -translated versions in sync. To do this we have come up with what we -believe is a very efficient work flow.

- -
    - -
  1. The documentation is written in a -moinmoin wiki (see for example -the -Squeeze release manual) with support for exporting the content as -docbook XML.
    2. - -
  2. This docbook document is given to po4a to extract a gettext style -.pot file with the content, which in turn is used to create .po files -with the translated text.
    3. - -
  3. The .po files are given to translators, and they can always tell -which part of the original wiki document is new or changed. They can -use their normal translation tools like lokalize or poedit to write -the translation. There is even a system in place to handle translated -images.
    4. - -
  4. The translated .po files are combined with the original docbook -XML document using po4a to create a translated docbook document.
    5. - -
  5. The final step is to use all the generated docbook files and -create PDF and HTML version of the original and translated documents.
    6. - -
- -

This setup work very well, but have a few issues. The biggest -issue is that the docbook support -we use in moinmoin is not actively maintained. The docbook -support is also buggy, and our build system contain workarounds to -make sure the generated docbook is usable despite these bugs.

- -

If you want to have a look at our setup, it is all there in the -debian-edu-doc -package.

-
-
- - - Tags: debian edu, english. - - -
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NUUG-presentasjon: Skolelinux - ferdig oppsatt skolenettløsning
-
13th March 2012
-

I dag presenterte jeg ny versjon av Skolelinux for NUUGs medlemmer. -Lysark -er tilgjengelige allerede og -video-opptak -kommer så snart videogruppa til NUUG får publisert den. Jeg kom på -endel punkter om nye ting i Squeeze-utgaven under veis som jeg burde -hatt med, og har sikkert skrevet noe tull på lysarkene som jeg ennå -ikke har oppdaget. Denne presentasjonen ble smurt ihop på veldig kort -tid, og jeg rakk ikke finpusse den. Håper den kan være lærerik -likevel.

-
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- - - Tags: debian edu, norsk, nuug. - - -
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