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The article summarizes the Hyperthreading technology as best as possible in just ten steps.

1. Hyperthreading (HT) is term coined by Intel for Simultaneous Multi-Threading (SMT).

2. Hyperthreading is meant for dual-core or multi-core processors like Pentium 4 with HT or Xeon MP.

3. The technology aims at better utilization of execution units in a processor which otherwise would be idle.

4. This technique is better than its predecessor Multithreading and Superthreading in the sense that in each instruction cycle, a processor can execute instructions from mutliple threads.

5. Hardware implemetation of Hyperthreading is not very complex as reported by Intel “Implementing HT took only 5% more die space in Xeon”.

6. Implemeting HT needs hardware resources to be divided into Replicated(e.g. Instruction Pointers), Partitioned (e.g.Queues) and Shared (e.g. Caches)

7. For actual performance gain, your applications have to hyperthreaded i.e. you have to parallelize your code.

8. Hyperthreaded applications use Shared Memory Programming Model. Most famous Shared Memory Programming standard is OpenMP (Open specifications for Multi-Processing), an effort initiated by Silicon Graphics Inc. and now supported by major industry players. OpenMP library is available for C,C++ and Fortran on both Windows and Unix platforms. OpenMP programming constructs consists of few compiler directives for parallelizing the code.

9. There are compilers and other automating tools that support shared memory parallel programming libraries like OpenMP. Some examples are Intel C++ Compiler, Intel VTune Performance Analyzer and High-Level tools from KAI Inc.

10. Hyperthreading does not necessarily increase performance. With wrong mix of code, it can even decrease performance.

Syed Feroz Zainvi has obtained M.Tech. (Comp Sc & Engg) degree from Indian Institute of Technology, Delhi (INDIA). His areas of interests are distributed computing, computer graphics and Internet Technologies. Currently, he is involved in Software Project Planning, Development and Management. His other interests include writing for magazines and contributing utility softwares on Magazine’s CDs. He also have flair for teaching computer science with new teaching methodologies.

His web-page URL is http://www.zainvi.tophnors.com

PCs have become a staple in every home. Without PCs, you will find it hard to stay connected and to even do the work required of you in school or in the office. With so much PC packages being shoved to our throat every time we go to department stores and computer shops, you’ll really get quite confused on what you really need and what PC package will fit your budget and lifestyle. To help you through this dilemma, here is a brief backgrounder of the parts of PCs that you should get to know.
Processor.
This is one of the three primary components of your PC. The processor is the part that determines how fast your computer process information. Intel is still the leading brand in processors but competitors such as American Micro Devices (AMD) are slowly catching up, offering cheaper alternative. In shopping for a processor, one should consider the following:
Clock speed - this will show the number of instructions that a computer can execute in a second. This usually comes after the brand name. Processors nowadays are already set at the gigahertz range.
Cache memory - this stores the data that were previously accessed. This simplifies the work of the computer as it would not take twice as long to access information already stored in memory bank. Without a cache memory, much of the work will fall on the RAM (Random Access Memory).
Operating temperature - some processors easily heats up. Before buying, make sure that you have asked about the operating temperature just in case you need to buy additional fans or put the computer in an air-conditioned room.
RAM (Random Access Memory).
RAM serves as the temporary memory of the PC, containing information that are needed for the computer and the programs to function. In addition to processors, RAM also determines the speed of the computer. The higher the RAM, the faster the computer is in accessing information and responding to commands.
Motherboard
This is where all the parts of the PC’s CPU (Central Processing Unit) are attached. Some motherboards already have videocards and soundcards embedded on it while others don’t. what is important however is to choose a motherboard that is compatible with your RAM and processor. Incompatibility of PC hardware can cause major problems and may even lead to the breakdown of your computer.
Hard drive.
This is the part where you store all the information in your PC. Picture a floppy disk with much much larger storing capacity. The hard drive serves as the permanent memory of your computer. Here you install all your programs and save all the documents that you need. It is also important that you buy a hard drive with really big capacity especially now when people are so used to storing multimedia files that may use up a lot of hard drive space.
Video cards
This is the part of the computer which determines the quality of the multimedia images that you will view. The higher the memory of the video card, the better is the picture quality and the colors. Also, video cards are also responsible for how fast multimedia images are accessed. This is especially needed if you use your computer for multimedia activities such as watching a movie or playing video games.

Dee Kerr makes it easy to find a PC that suits your needs, quickly & easily. Learn the essential keys to look out for. visit: computer buying guide website, or want to building a PC?