The differences between Linux IO Scheduler

The Linux kernel input/output scheduler (IO Schedulers) controls the way the kernel handles read/write to disks. Different I/O schedulers may have different impact on certain workloads. Here are the list of available Linux I/O schedulers:

1) Noop
Noop scheduler is the simplest IO scheduler available in the kernel. It does not perform sorting or seek-prevention. It is intended for devices that has no mechanical parts or is capable of random access such as SSD or flash-disk.

2) Anticipatory (AS)
Anticipatory is the default I/O scheduler for Linux kernel (2.6.x) until it was replaced by CFQ. It tries to optimize disk I/O by minimizing disk seeking/head movement whenever possible. However, it does has performance impact on file and database servers

3) Deadline
As the name implies, the deadline scheduler imposes deadline on all operations. This is to prevent resource starvation, so that every operation can be completed on time without being starved by other operations. The kernel documentation suggests Deadline scheduler to be used on storage and database servers

4) Completely fair-scheduling (CFQ)
CFQ tries to allocate the same resources to all users in the same time interval, hence the name. It tries to allocate fair amount of resources to all users, which would be ideal to use this on a multi-user/multi-purpose system. It is the default scheduler for Linux kernel since 2.6.18.

Microsoft Windows XP on vanilla AMD decTOP (Geode) – wished Linux GUI is this light

This is a continuation from my post of running Android on my AMD decTOP machine.

Of all Linux distribution that I tried, I found out that only Puppy Linux offered a usable GUI desktop environment on a plain vanilla AMD decTOP out of the box, but that is not without some effort on the installer side.

On the other hand, it is very easy to get Windows XP running on a plain vanilla AMD decTOP, without additional hardware upgrades. Here is my prove.

It seems Windows XP is more tolerant to low end desktops (or in this case, decTOP) than Linux operating system for fully GUI environment. Are we getting bloated?

AMD decTOP specs
Processor: AMD Geode GX 500, 366 MHz clock rate

Play Urban Terror, a free Counter-Strike like game on Linux

Right now I’ve been playing Urban Terror (or UrT), it is a First Person Shooter (FPS) game similar to Counter-Strike. The game was developed using the open source Quake III Arena engine and can be played under GNU/Linux, Microsoft Windows and Mac OS X operating systems.

You can download Urban Terror binaries from Urban Terror Official Website

The game is available for 32bit and 64bit platform and is tested on Fedora 13 and Ubuntu 10.10 (Maverick Meerkat) releases

Grab Dreamhost Promo Codes and Crazy Offerings!

Usually I don’t post things such as promo codes and offerings on my blog, but I’ll make an exception for this case.

Dreamhost has made available 5 promo codes that gives you special offer on their already generous hosting plans, which includes :

  • Disk Storage up to 500GB
  • Monthly Bandwidth at 5TB
  • Secured Shell access (SSH)
  • Unlimited Domain host
  • PHP5, Python, Perl, Ruby On Rail support
  • Custom DNS configuration
  • CVS, SVN Repository and WebDav support
  • User management control, you can add user in your own hosting accout, each user can accesss their own shell!
  • and other exciting features…!

Oh they have a Dreamhost Wiki page too
The Promo codes gives you :

  • Four (4) times the normal disk and bandwidth!
  • If you choose their five-year plan, you’ll get $150 off!
  • If you choose their ten-year plan, you’ll get $200 off!

Here’s the list of Promo Codes (to be entered in “Promo Code” field when you sign up) :


Alternatively, you may choose to enter “KIROSTUDIO” promo code, to get USD 70.40 discount on their web host offerring!

All promo codes except “KIROSTUDIO” expires on 15 October 2008, so hurry up!

How to convert OpenXML docx files to OpenDocument odf in Windows and vice versa

This guide might be a little different from the others because I write this for the Windows users. Here’s how to convert Microsoft OpenXML docx files to odf OpenDocument files (and vice versa) in Windows using only commandline :

  • First, make sure you downloaded odf-converter tool and copy it to appropriate folder.
  • Convert the files(s) using this command line :
    odfconverter /I filename.pptx
    and the tool will perform the conversion effortlessly.
  • You can use this command to convert multiple files :
    odfconverter /BATCH-DOCX /I c:\newfiles\

    replace /BATCH-DOCX with /BATCH-PPTX, /BATCH-XLSX, /BATCH-ODF, /BATCH-ODP if necessary.

Odfconverter also supports converting Open Document files (ODF, ODP, ODT) to OpenXML files (PPTX,DOCX,XLSX) making it a handy tool to use.

Why odfconverter?
Odfconverter is a (relatively) small and compact standalone tool for converting Office 2007 files to their OpenDocument counterpart. The convenient batch mode conversion makes it attractive tool to use when converting multiple files between the two formats.

The only downside with this converter is that it does not convert mathematical formula pretty well compared to other features.

[Source OOOninja]