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Differences Between LDM 5 and LDM 6

Differences Between LDM 5 and LDM 6. Unidata Program Center University Corporation for Atmospheric Research. Presentation Assumptions & Goals. Assume: you generally understand how the LDM works Goals: Understand specific behavior of LDM 5 & LDM 6

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Differences Between LDM 5 and LDM 6

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  1. Differences Between LDM 5 and LDM 6 Unidata Program Center University Corporation for Atmospheric Research

  2. Presentation Assumptions & Goals • Assume: you generally understand how the LDM works • Goals: • Understand specific behavior of LDM 5 & LDM 6 • Understand differences in behavior and how they affect performance

  3. LDM Goals • RELIABLY deliver data products via the Internet in a timely manner • Support multiple sources of data products • Support user-customizable actions on received data products

  4. LDM LDM LDM LDM LDM Data-Feed Topology Source LDM

  5. OK send NULLPROC OK > 5 m size <= 16 KB send HEREIS done size > 16 KB send 16 KB BLKDATA DON’T SEND RECLASS send COMINGSOON SEND OK adjust selection criteria RECLASS Upstream LDM 5 Behavior get next product

  6. reconnect reply OK > 12 m save & reply OK NULLPROC BLKDATA new HEREIS done save & reply OK what is it? reply DON’T SEND too old COMINGSOON what is it? BLKDATA duplicate reply RECLASS reply SEND too old new Downstream LDM 5 Behavior get next message

  7. send NULLPROC OK send HEREIS > 30 sec size <= max size > max send 1 BLKDATA DON’T SEND send COMINGSOON SEND adjust selection criteria RECLASS Upstream LDM 6 Behavior get next product

  8. NO reconnect reply OK send IS ALIVE NULLPROC > 1 m YES BLKDATA done save HEREIS reply DON’T SEND save COMINGSOON BLKDATA duplicate what is it? reply RECLASS reply SEND too old new Downstream LDM 6 Behavior get next message

  9. Performance Improvement:IDS|DDPLUS Feed

  10. Performance Improvement:CONDUIT Feed

  11. Improved Performance Permits Volume Increase

  12. Odd Load-Average Behavior on Thelma

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