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User Patterns from SkyServer

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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User Patterns from SkyServer

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  1. 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 • Once template finalized, run on whole dataset • Share results with others Through the web services interface • Frequent use of crawlers • Often bucketize requests (checkpointing)

  2. MyDB/CasJobs Nolan Li, JHU • Server side user databases • Can perform joins with main databases • Users can create their own UDFs etc • Every user action is recorded • Can share tables, do simple graphics server side MyDB DR4 DR5 DR6 S4

  3. JHU Petascale Archive • We are building a distributed SQL Server cluster exceeding 1 Petabyte • Just becoming operational • 40x8-core servers with 22TB each, 6x16-core servers with 33TB each, connected with Infiniband • 10Gbit lambda uplink to StarTap • Funded by Moore Foundation, Microsoft and the Pan-STARRS project • Dedicated to eScience,will provide public access

  4. Amdahl’s Laws Gene Amdahl (1965) Laws for a balanced system • Parallelism: max speedup is S/(S+P) • One bit of IO/sec per instruction/sec (BW) • One byte of memory per one instruction/sec (MEM) • One IO per 50,000 instructions (IO) 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

  5. Components • Data must be heavily partitioned • It must be simple to manage • Distributed SQL Server cluster • Management tools • Configuration tools • Workflow environment for loading/system jobs • Workflow environment for user requests • Provide crawler framework • Both SQL and procedural languages • User workspace environment (MyDB)

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