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How to Fail at Benchmarking
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- 1 Introduction
- 2 Cassandra
- 3 Datastax
- 4 Benchmarks
- 5 Squid vs Cat
- 6 Why this talk
- 7 Benchmarking is a people exercise
- 8 We have caches everywhere
- 9 On our infrastructure we have
- 10 Database
- 11 Clock resolution
- 12 Warming period
- 13 Background noise
- 14 Windows XP
- 15 Average
- 16 Capacity
- 17 Average Latency
- 18 Response Time
- 19 How many 9s
- 20 Unluckiest users
- 21 Measuring response time
- 22 Requirements
- 23 The good part
- 24 Statistics
- 25 Yellow Lab Tools
- 26 Normal Distribution
- 27 Un unskilled
- 28 Metrics
- 29 HDR histogram
- 30 Graphing
- 31 Code
- 32 Flag
- 33 Explanation
- 34 Prerun check
- 35 Benchmark throughput
- 36 Benchmark latency
- 37 Benchmark expectations
- 38 Outliers
- 39 Results
- 40 Reality
- 41 Latency
- 42 Coordinated Emission
- 43 Test the tester
- 44 The request should have been sent
- 45 Another fix
- 46 Summary
