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Enhancing BDII Performance: Update on Caching Strategies and Impact Analysis

This update by Lorenzo Dini, WLCG Information Officer, explores the impacts of caching on the BDII service performance. It covers the benefits of stability, performance tests conducted on production-like hardware, and the comparison between cached and non-cached services. Main findings indicate no degradation in query performance, a minimal size overhead of 3%, and significant improvements in stability ranging from 28X to 46X. The next steps include functional testing by experiments and integrating caching by default in the production environment.

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Enhancing BDII Performance: Update on Caching Strategies and Impact Analysis

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  1. June 08, 2011 An update on theCached BDII Lorenzo Dini – WLCG Information Officer

  2. Overview • To Cache Or Not To Cache • How the cache impacts on the service • What are the benefits on stability • Tests performed on production-like hardware • Non-Cached: lcg-bdii.cern.ch • Production DNS round-robin • Cached: clcg-bdii.cern.ch • Dedicated test service with 4-day cache enabled • Same hardware as any node of lcg-bdii.cern.ch Lorenzo Dini

  3. Content Dump (seconds) Average time: 5.4 seconds faster Lorenzo Dini

  4. Total Objects Average overhead: 3% (4500 objects) Lorenzo Dini

  5. Objects Added/Removed All objects Average improvement: 46X Lorenzo Dini

  6. Objects Added/Removed No GlueLocationLocalID Average improvement: 28X Lorenzo Dini

  7. Added/Removed per type No GlueLocationLocalID Lorenzo Dini

  8. Conclusions • No query performance degradation • Small size overhead (3% in object number) • Stability highly improved (28X – 46X) • Ready for Prime Time! • Next steps • Functional testing by experiments • Introduce it to the lcg-bdii DNS round-robin • Cache enabled by default in production Lorenzo Dini

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