re: Applications Meme

I got tagged from kargig, so here are my answers:

  1. Which desktop manager do you use more often ?
    xfce
  2. Which desktop application you would not like to see implemented again on linux? And why?
    Yet another Web browser.. We have enough!
  3. Which desktop application you definitely would like to see implemented on linux? Describe it briefly or point out to a similar application.
    Picasa (linux native, not via wine)
  4. Write the name of the last project (not the very best, the last!) that made you wish to thank their developers so you can thank them now!
    Munin (recently finished a massive deployment on 120 systems), thanks Linpro!
  5. (Optional) Link the blogs of 1-3 people you’d like to take part to this meme. (no more than three). you can skip this question if you like.
    I tag HSOC and v13.

Time to disconnect?

Food for Thought – Time to Disconnect?

Copied from ENISA Quarterly Review Vol. 4, No. 2, Apr-Jun 2008
by Nick Coleman and Pernilla Skantze

It seems widely accepted today that we should regularly check SMS and e-mail on our mobile devices during most meetings. The best situation is when there is wireless broadband access in a meeting room, as we can then do our ‘real’ work (i.e. checking e-mail) while attending the meetings or conferences that for some reason we do not consider demand the same level of attention as e-mail.

Wireless broadband solutions and fixed-mobile functions make it easy to be connected even when we are on vacation, regardless of whether we spend our holidays on a mountain top in the Alps or on a distant beach. When we go for lunch or leave work we can still answer the numerous messages from a person with phone – and we do. Many people say that it takes them several days of vacation to control the urge to check their e-mail. It’s a bit like giving up cigarettes. Only worse…

At the same time, parents all over the world are fighting to tear their children away from their computers or games consoles to go out and play with their friends instead and to do ‘normal’ things that we used to do in the time before all children and teenagers had a computer on their desks.

Or is that really it? In a minor study carried out in the northern outskirts of Europe recently, a number of people were asked to refrain from mobile phone use for a couple of weeks. It turned out that, besides the fact that they had to plan their days much more rigorously, what they missed the most was the alarm clock, the radio function and the fact that they never knew
what time it was.

So the question is, is this healthy? Are we increasingly in an ‘always on’ culture, where we take our Blackberry, mobile phone or laptop with us over the weekend and on holiday as well? Another piece of research suggests taking the laptop on holiday means it may come back with new malware from children accessing sites with new security risks!

So should we all be disconnecting for the summer – throwing away our devices and switching off from work? In the new Sex and the City movie, the main character in the film, Carrie, throws her mobile phone into the sea.

This action of strong emotional distress only happens after she has received numerous messages from a person with whom she has fallen out, and probably many of us have felt the same urge at one control the urge to check their e-mail. It’s point or another. Especially nowadays, when we can’t slam the receiver down in anger any more – pressing “no” doesn’t really have the same effect.

Although many of us still remember a life without mobile devices, was it really any better? Or are all the scares about our dependency on new technology just reactionary, while our lives constantly improve?

And when we go abroad we know transport and hotel rooms can be arranged from a nice bar or beach, without spending time in endless queues. And adding all the other functions we need – camera, clock, wake-up call and music player – our advice to you would be – don’t forget your mobile phone this summer!


Pernilla Skantze (pernilla.skantze@enterprise.ministry.se) is a lawyer specialising in IT-related issues, working for the Swedish Ministry of Enterprise, Energy and Communications, and a member of the ENISA Management Board.

Nick Coleman (nick@n-coleman.com) is the former Head of Security Services for IBM across Europe, the Middle East and Africa, he is currently the Independent Reviewer of information assurance and security to the UK Government and is a member of ENISA’s Permanent Stakeholders’ Group.

New in Ubuntu 8.04

Διαβάζοντας τα release notes του Ubuntu 8.04 που βγήκε προχθές θέλω να δω τουλάχιστον τα παρακάτω:

  • Dynticks for AMD64 και Completely Fair Scheduler στον kernel (2.6.24)
  • Uncomplicated Firewall (απλό command-line frontend για ipchains)
  • ActiveDirectory Integration (με χρήση του Likewise Open)
  • SELinux Support (in addition to AppArmor)
  • Filesystems mounted with relatime option, for improved performance.
  • /bin/sh is now dash (τέρμα τα bash-isms για scriptακια που θέλουν να είναι portable)

Custom kernel compile

Διαβάζοντας την περασμένη βδομάδα το Linux Journal βρήκα μετά από χρόνια επιτέλους μία ωραία αφορμή για να κάνω και πάλι compile τον kernel στο linux μου.. και εξηγώ:

Παλιότερα, το kernel compile ήταν κάτι πολύ συχνό (ακόμα και σαν benchmark ταχύτητας), γιατί κάλυπτε τις εξής δύο ανάγκες.. Πρώτα για να κόψω ότι δε χρειαζόμουνα για το μηχάνημά μου ώστε να ελευθερώσω περισσότερα resources από τα λιγοστά που είχα, και δεύτερον για να δουλέψει επιτέλους η τάδε συσκευή που είχα και ο αντίστοιχος driver μόλις πριν λίγο είχε ενσωματωθεί στον kernel που είχε κυκλοφορήσει..

Πρέπει να έχουν περάσει τουλάχιστον 4 χρόνια από την τελευταία φορά που έκανα compile kernel.. Αυτό γιατί το hardware που έχω και οι αλλαγές σ’αυτό ήταν ελάχιστες ή πάντα αυτό που αγόραζα ήταν ήδη υποστηριζόμενο από τους stock kernels του distribution που είχα.

Απο ένα σημείο και μετά δηλαδή, δεν υπήρχε λόγος για να κάνω custom kernel compile αφού με κάλυπταν (και με το παραπάνω) οι vendors και μπορούσα να φορτώσω σαν module ότι χρειαζόμουνα. Ισα ίσα, που κέρδιζα χρόνο, κόπο και είχα εύκολο upgrade path.

Την περασμένη βδομάδα λοιπόν, στο άρθρο Go Green, Save Green with Linux διάβασα για το PowerTOP.

Computer programs can make your computer use more power. PowerTOP is a Linux tool that helps you find those programs that are misbehaving while your computer is idle. The application that misbehaved the most was the Linux kernel. However, as of version 2.6.21, the Linux kernel went tickless, and no longer has a fixed 1000Hz timer tick. The result (in theory) is huge power savings because the CPU stays in low power mode for longer periods during system idle.

Και σαν να μην έφτανε αυτό, χθες διαβάζοντας στο Linux Weekly News ότι βγήκε ο 2.6.25, ανακάλυψα και τον ξάδερφο του powertop, το LatencyTop.

LatencyTOP is a Linux tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups. […]

LatencyTOP focuses on the cases where the applications want to run and execute useful code, but there’s some resource that’s not currently available (and the kernel then blocks the process). This is done both on a system level and on a per process level, so that you can see what’s happening to the system, and which process is suffering and/or causing the delays.

Ωρα για kernel compile μετά από τόσα χρόνια λοιπόν, γιατί το debian etch που έχω έχει ακόμα 2.6.18..

uptime wraps again

Το uptime δεν είναι αυτοσκοπός (Downtime is an option). Σ’ ένα παλιό σύστημα εμφανίστηκε πάλι το φαινόμενο ‘uptime-reset-without-reboot‘ (μου συμβαίνει κάθε 500 μέρες)..

stsimb@services:~$ uptime
Unknown HZ value! (395218) Assume 100.
23:44:32 up 3:01, 2 users, load average: 0.08, 0.04, 0.01

stsimb@services:~$ tail -5 .uptime.log
20:15:01 up 497 days, 1:59, 1 user, load average: 0.00, 0.01, 0.00
20:30:01 up 497 days, 2:14, 1 user, load average: 0.00, 0.00, 0.00
20:45:01 up 1 min, 1 user, load average: 0.04, 0.03, 0.00
21:00:01 up 16 min, 1 user, load average: 0.00, 0.00, 0.00
21:15:01 up 31 min, 1 user, load average: 0.00, 0.02, 0.00

Είναι cosmetic bug (δεν επιρρεάζει σε τίποτε το σύστημα) και διορθώνεται πολύ απλά…

reboot :)