6% share of all U. S. searches… the United States Google's lead was even larger, exceeding a 90% share of search queries in numerous countries. "The second force that needs to be analyzed is the threat of substitutes. Presently,…… Google Cluster Architecture"Web Search for a Planet: The Google Cluster Architecture," IEEE Micro, Mar Apr. , 2003, 22 28. The central idea of this IEEE Micro article is that Google has designed a search engine which is energy efficient, reliable, and so cost effective that it allows them to provide superior service. The article begins by pointing out that every request to a search engine requires complex computations. When Google gets a request, it reads hundreds of megabytes of data and uses tens of billions of CPU cycles. With thousands of such requests happening every second, Google's infrastructure compares in size to a supercomputer installation!Energy efficiency and price performance ratio are the most important factors to its design. Easy parallelism is the main priority so that different queries can run on different processors the overall index is partitioned so that a single query can use multiple processors.