User Patterns from SkyServer. 1/f power law of session times and request sizes No discrete classes of users!! Users are willing to learn SQL for advantage Quickly adopted to server-side MyDB environment 1600 active users of MyDB Start with small ad-hoc requests
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Nolan Li, JHU
Gene Amdahl (1965) Laws for a balanced system
Modern multi-core systems move farther away from Amdahl’s Laws (Bell, Gray and Szalay 2006)
For a Blue Gene the BW=0.013, MEM=0.471.
For the JHU cluster BW=0.664, MEM=1.099