Essay on Hyper Threading Technology

4555 Words Mar 20th, 2011 19 Pages


This report describes the Hyper-Threading Technology architecture, and discusses the microarchitecture details of Intel's first implementation on the Intel Xeon processor family. For that reason, firstly, general processor microarchitecture and thread level parallelism will be explained. After that, hyper-threading technology architecture will be discussed in a detailed manner. Then, first implementation examples will be given. Also, some important components will be presented required for a hyper-threaded processor. After all, performace results of this new technology will conclude the report.

Hyper-Threading Technology brings the concept of simultaneous multi-threading to a general
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The above graph shows the relative increase in performance and the costs, such as die size and power. In order to isolate the microarchitecture impact, this comparison assumes that the four generations of processors are on the same silicon process technology and that the speed-ups are normalized to the performance of an Intel486 processor. Although we use Intel's processor history in this example, other high-performance processor manufacturers during this time period would have similar trends. Intel's processor performance, due to microarchitecture advances alone, has improved integer performance five- or six-fold. Most integer applications have limited ILP and the instruction flow can be hard to predict.

1.2. Thread-Level Parallelism

A look at today's software trends shows that server applications consist of multiple threads or processes that can be executed in parallel. On-line transaction processing and Web services have an abundance of software threads that can be executed simultaneously for faster performance. Even desktop applications are becoming increasingly parallel. Intel architects have been trying to leverage this so-called thread-level parallelism (TLP) to gain a better performance vs. transistor count and power ratio.

In both the high-end and mid-range server markets, multiprocessors have been commonly used to get more performance from the system. By adding more processors, applications potentially get

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