My world! a world of my own that can be seen differently than it is

2007-12-05T01:02:00.001-08:00

Intel's new chip

Intel last week demonstrated a working processor with 80 individual processing cores. Each core, or "tile" as Intel calls them, consists of a compute element and a router that allows each tile to connect to its neighbor. The chip can deliver more than 1 trillion floating point operations per second (teraflops), depending on how fast it's running. This is only a research project right now, as there are a lot of challenges involved in making an 80-core chip that's a practical option for PCs and servers. Second picture shows a closer look of the processor chip which is still at research level even though it is demonstrated at media.

2007-11-22T09:56:00.000-08:00

Dual Core

A dual core processor is a CPU with two separate cores(two processor logic units) on the same die, each with its own cache. It's the equivalent of getting two microprocessors in one.

In a single-core or traditional processor the CPU is fed strings of instructions it must order, execute, then selectively store in its cache for quick retrieval. When data outside the cache is required, it is retrieved through the system bus from random access memory (RAM) or from storage devices. Accessing these slows down performance to the maximum speed the bus, RAM or storage device will allow, which is far slower than the speed of the CPU. The situation is compounded when multi-tasking. In this case the processor must switch back and forth between two or more sets of data streams and programs. CPU resources are depleted and performance suffers.

In a dual core processor each core handles incoming data strings simultaneously to improve efficiency. Just as two heads are better than one, so are two hands. Now when one is executing the other can be accessing the system bus or executing its own code. Adding to this favorable scenario, both AMD and Intel's dual-core flagships are 64-bit.

To utilize a dual core processor, the operating system must be able to recognize multi-threading and the software must have simultaneous multi-threading technology (SMT) written into its code. SMT enables parallel multi-threading wherein the cores are served multi-threaded instructions in parallel. Without SMT the software will only recognize one core. Adobe Photoshop is an example of SMT-aware software. SMT is also used with multi-processor systems common to servers.

A dual core processor is different from a multi-processor system. In the latter there are two separate CPUs with their own resources. In the former, resources are shared and the cores reside on the same chip. A multi-processor system is faster than a system with a dual core processor, while a dual core system is faster than a single-core system, all else being equal.

2007-10-21T22:28:00.000-07:00

HAN - Home Area Network with ZigBee

Some time ago we had only IR devices which controlled them remotely and made our living an ease. Today technology is evolving a new concept (HAN) to control our home appliances. ZigBee introduces a single standard which connects home environment where we can have a central base to control. With ZigBee HAN does not need the line-of-sight to operate the remote controllers. A single remote controller for all devices with learning of the introduction of new devices.

2007-07-25T05:51:00.001-07:00

ZigBee Stack

2007-07-03T23:48:00.000-07:00

ZigBEE advantage for community

The global primary energy demand will grow by 1.6 percent per year from 2004 to 2030. Worldwide electricity demand will rise to 30,116 billion kilowatt-hours in 2030, more than double the 2003 level. Today, ZigBee® is addressing global concern for substantially improved energy efficiency through an open and interoperable standard for demand response, energy management and metering services. This approach will increase energy efficiency in homes, commercial buildings and industrial facilities around the world to save energy.

2007-05-13T21:12:00.000-07:00

ZigBee

Brief Overview

ZigBee is a PAN technology on the IEEE 802.15.4 standard. Unlike Bluetooth or wireless device, ZigBee devices have the ability to form a mesh network between nodes.

A mesh network is a local area network (LAN) that employs one of two connection arrangements, full mesh topology or partial mesh topology. A full mesh topology is shown in the picture. [A mesh network is reliable and offers redundancy. If one node is not available, all others can still communicate directly or through intermediate nodes.]

Recent news on ZigBee
When multiple ZigBee wireless personal area networks (WPANs) are in close proximity to each other, contentions and collisions in transmissions will lead to increased packet delays. However, there is no existing study on how delay performance would be affected in a crowded real-life environment where each person walking down a busy street would be wearing a ZigBee WPAN.

Experiment carried out in real a real world environment
To be pragmatic, we derived a mobility pattern from the analysis of a real-life video trace. Then, we estimated the delay performance from the video trace by combining data collected from ZigBee experiments. The results show that the 300 ms packet delay requirement will not be met for only 11% of the time. When failure occurs, it will last for an average duration of 1.4 s.

2007-05-09T10:08:00.000-07:00

Bandwidth Monitor for ur Debian
This is a small bandwidth monitor. Monitors up to 16 interfaces and shows totals at the same time.
Here is the installation in Debian.

#apt-get install bmw

This installs the tool and try the following command to try it.

#bmw

For more information, look in man pages. The output of the above command is as follows.

Bandwidth Monitor 1.1.0

Iface RX(KB/sec) TX(KB/sec) Total(KB/sec)

lo 0.000 0.000 0.000

eth0 0.327 0.326 0.653

eth1 0.000 0.000 0.000

Total 0.327 0.326 0.653

Hit CTRL-C to end.

See, It's really easy. Now you can check ur bandwidth with no trouble. Try it & feel it. Bye. C u.

2007-03-28T00:27:00.001-07:00

Latex is very important in document writing and it adds a greate deal of professionalism to your document. We normally get into troubles when inserting different symbols. Here I submit a reference for your convenience.

http://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/

2006-10-25T20:14:00.000-07:00

LINUX Kernel 2.6.x .xx compile

LINUX Kernel compile
This is only for people who have experienced with linux commands and linux file structure. sufficient knowledge is needed.
-------------------------------
Linux Kernel 2.6.x... compiling step by step

step 1:

download the latest linux kernel from the internet

eg: www.kernel.org

step 2:

extract the archive file in to /usr/src

eg:
cp linux-2.6.17.tar_2.gz /usr/src
tar xzvf linux-2.6.17.tar_2.gz

step 3:
go to the extract directory and you can configure your kernel using following command

*in a command mode use

make menuconfig

*in graphical interface

make xconfig or make gconfig

step 4:

configre your kernel,according to your machine configuration;

step 5:

after that do the following commad

make modules
make modules_install
make bzImage

you can do this by one line

step 6:
create initial ram disk file using follwing command

mkinitrd -o /boot/initrd.img-2.6.1x.x-386 2.6.x.x

-or-

mkinitramfs -o /boot/initrd.img-2.6.1x.x-386 2.6.1x-386

if you want to see the created initrd.img file, type following command-

zcat /boot/initrd.img-2.6.17.4-386 |cpio --list

step 7:

now you must in the kernel source folder

do the following command(linux version must be changed according to the your version)

cp arch/i386/boot/bzImage /boot/vmlinuz-2.6.17.4

cp System.map /boot/System.map-2.6.17.4-386

cp .config /boot/config-2.6.17.4-386

step 8:

now you have finished compiling kernel & some of the configuration

step 9:
edit your menu.lst file

vi /boot/grub/menu.lst

here you must give a path to new kernel & name and the imagefile

step 10:

reboot your system

2006-10-23T02:33:00.002-07:00

let's learn some computer stuff nw. Do u have a flash drive (USB)? Then do u want to add a background to the falsh drive and add ur own icon to be displayed in My Computer (Windows). Here's the code for the icon display.

just make an autorun file. open the notepad and type the following.
-----------------------------------
[autorun]
icon = UCSC.ico
-----------------------------------
UCSC.ico may be any picture of the form of .ico . that is an icon format. and finally save the file as autorun.inf . u r done.

code for flash drive background
type the following in the notepad.
-----------------------------------
[ExtShellFolderViews]
{BE098140-A513-11D0-A3A4-00C04FD706EC}={BE098140-A513-11D0-A3A4-00C04FD706EC}

[{BE098140-A513-11D0-A3A4-00C04FD706EC}]
Attributes=1
IconArea_Image=kalpa1.jpg
IconArea_text=0x00ffffff

[.ShellClassInfo]
ConfirmFileOp=0
font color="#00ffffff"
-----------------------------------
in the iconArea_image, u can give any picture of type jpg, bmp, gif, etc. here i have used a picture called kalpa.jpg picture of the jpeg format. u can change the Icon_Area_text and font color by using html color codes. try this. enjoy. now u can customize ur flash drive with ur identity.

2006-10-03T00:16:00.000-07:00

Enjoying a ride.

2006-09-07T20:33:00.000-07:00

Here is a picture of my cousins. You can see me there. ( the tallest guy)

2006-09-07T20:24:00.000-07:00

Thanks alot for ur comments on my last question published earlier. Now another one. It's ok no?

Do we always need to look at the darker side of the life? Can we beleive in JESUS even though we go through various difficulties in our life? The important point is to remember that Jesus is with us in our difficulties, But not always send us into a bed of flowers. Comment on.

2006-08-23T21:14:00.001-07:00

I'll ask u all a question. Please be honest when u comment on.
Girls
What do you expect from your boyfriend?
Boys
What do you expect from your girlfriend?

2006-08-23T03:43:00.000-07:00

23.08.2006

Hi everyone,
I went on a trip to the eastern province (Ampara) last week & spent 5 days there in hospital quarters. It was a nice trip that I went with all of my cousins & had really a good time over there. One day we went to see wild elephants late in the evening and there was only one bulb at the elephant cross over path. After we went beyond that the light went off and We were really frightened at that moment. Our grand mother could hardly run and fortunately there were no elephants passing by on that day. actually we all had our hearts on our hands. You know Sri Lanka is a really beautiful country and I enjoyed very much during my trip. if you are a foreigner I can guaraty that you will not forget Sri Lanka If one day you visit here.
ok bye for now. God Bless You.

2006-08-10T04:16:00.000-07:00

Hi,
My name is Kalpa Gunaratna. 22 years old & hope doing well at the University of Colombo School of Computing Sri Lanka( undergraduate & 3rd year). It's a whole new experience to become an undergraduate of a Sri Lanka University.
Speaking about my self, I'm a catholic & I beleive in JESUS who is my only saviour. I experience him day by day and through CSM( Catholic Student Movement of Colombo University). For now, this is enough. You can read about me more later. It's me, Kalpa. God Bless you all.