Understanding

Understanding & Addressing Blocking-Induced Server Latency Yaoping Ruan IBM T.J. Watson Research Center Vivek Pai Princeton University

Background – Web servers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Paper Contributions

Outline ,[object Object],[object Object],[object Object],[object Object]

Experimental Setup ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Latency Analysis Methodology ,[object Object],[object Object],[object Object],[object Object],Flash Latency Profile – 336 Mb/s

Evidence for Blocking in Flash ,[object Object],[object Object],[object Object],[object Object],[object Object],CDF of # of ready events for Flash

Evidence for Blocking in Apache ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Identifying Blocking using DeBox ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Growth of Median Latencies ,[object Object],[object Object]

Response Time vs Dataset Size >99.5 % cache hits

Service Inversion ,[object Object],[object Object],[object Object],[object Object],1 2 3 4 … 9 10

Ideal Service Breakdown small files large files

Flash Service Breakdown Flash CDF breakdown by decile at load level 0.95 Service inversion at this level is 0.58 small files large files

Apache Service Breakdown Apache CDF breakdown by decile at load level 0.95 Service inversion at this level is 0.58 small files large files

Solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Flash Ready Events ,[object Object]

New-Flash Latency Profile New-Flash Latency Profile – 450 Mb/s Flash Latency Profile – 336 Mb/s ,[object Object],[object Object]

Flashpache Performance ,[object Object],[object Object],Flashpache Latency Profile – 273 Mb/s Apache Latency Profile – 241 Mb/s

Flash Service Breakdowns Flash New-Flash

Flashpache Service Breakdowns Apache Flashpache

Latency Scalability Response time at 0.95 load level

In The Paper ,[object Object],[object Object]

Conclusion ,[object Object],[object Object],[object Object],[object Object]

Thank you www.cs.princeton.edu/nsg/papers Princeton University Network Systems Group

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Effects on Response Time Flash latency CDFs

Understanding

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