SAS System 9 introduces a threaded kernel into the core part of the SAS System. These threaded kernel services enable SAS R&D to develop software that runs faster, increases throughput, and enhances scalability. This paper looks at the threaded kernel architecture from a fundamental perspective, answering the following questions: what are threads and how do they relate to Symmetric MultiProcessor (SMP) computers? How does threaded software improve job performance? What does parallel processing buy and what does it cost? Exactly what kind of improvements should one expect with SAS 9? Answers to these questions, as well as additional information about specific SAS 9 cases that highlight PROCs, engines, and other components, is provided in this paper.
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