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Hint-based Acceleration of Web Proxy Cache. Daniela Rosu Arun Iyengar Daniel Dias IBM T.J.Watson Research Center Unversity of Yuan Ze,Syslab Mike Tien [email protected] Outline. 1. Accelerated Web Proxy

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hint based acceleration of web proxy cache

Hint-based Acceleration of Web Proxy Cache

Daniela Rosu Arun Iyengar Daniel Dias

IBM T.J.Watson Research Center

Unversity of Yuan Ze,Syslab

Mike Tien

[email protected]

  • 1.Accelerated Web Proxy
  • 2.Hint Representation
  • 3.Hint Consistency
  • 4.Comparison
  • 5.Proxy Accelerator Cache
  • 6.Throughput Improvements
  • 7.Impact of Hint Management
  • 8.Summary
  • 8.Conclusion
1 accelerated web proxy
1.Accelerated Web Proxy
  • To speed up proxy caches by reducing their cache-miss overhead.
  • Extended content-based router called a proxy accelerator(PA).
  • With embedded O.S optimized for communication.
2 hint representation
2.Hint Representation
  • Accurate–information

directory scheme (Hash Table)

  • Approximate-information

based on Bloom Filters

--bitmap(hint space)

PA(entries,hash table)

WP(collision counter)

hint representation cont
Hint Representation(cont.)

--independently & interleaved

3 hint consistency
3.Hint Consistency
  • Protocol ensure that the information at the PA site reflects the content of the WP
  • Protocol choices

--entity that identifies the updates

--protocol initiator

--rate of update messages

--exchanged information

  • Previously proposed

--WP-only update

--eager hint register

5 proxy accelerator cache
5.Proxy Accelerator Cache
  • PA should maximize the hit ratio

--size , GDS(1)

  • WP should minimize the Network-related costs
8 summary
  • Bloom Filter-based scheme exhibits lower computation and communication overhead
  • WP meta-data may reduce its memory hit ratio
  • Hint look-up overheads are small with respect to the typical request processing overhead
  • Eagar hint registration reduces update-related overheads and prevents hit ratio reductions caused by update delay
  • False hit ratio is more significantly affected by hint representation than by update period
9 conclusion
  • This miss ratios at proxy caches are often relatively high,we have developed a method to improve the performance of a cluster-based Web proxy by shifting some of its cache miss-related functionality to be executed on a proxy accelerator
  • Eagar registration is a “must” and that the Bloom Filter-based scheme is more appropriate than the directory scheme for large WP clusters or when PA and WP nodes have comparable power