SLA-Driven Planning and Optimization of Enterprise Applications
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1 SLA-Driven Planning and Optimization of Enterprise Applications H. Li 1, G. Casale 2, T. Ellahi 2 1 SAP Research, Karlsruhe, Germany 2 SAP Research, Belfast, UK Presenter: Giuliano Casale WOSP/SIPEW Conference San Jose, Jan 29 th, 2010
2 Sizing enterprise applications Capacity planning Periodic scalability assessment Focus on performance and costs Service Level Agreements (SLAs) Constraints on responsiveness (throughput, resp. time, ) Total Cost of Ownership (TCO) HW provisioning SW upgrades Infrastructure management Power consumption WOSP/SIPEW 2010, San Jose 2/23
3 Motivation: SaaS & Sizing Software-as-a-Service (SaaS) increasingly more popular Service Level Objectives SaaS vendor Pricing model? Strong need for sizing frameworks Which hardware? How many virtual cores? Optimal SW tuning? WOSP/SIPEW 2010, San Jose 3/23
4 Contributions to Sizing Performance model of a commercial enterprise application SAP ERP Hardware cost model Benchmark-driven approach Power consumption cost model Measurement-driven model Multi-objective optimization approach to sizing How to simultaneously minimize cost and response time WOSP/SIPEW 2010, San Jose 4/23
5 Performance Modeling WOSP/SIPEW 2010, San Jose 5/23
6 SAP ERP ERP: management of business processes and resources Workload complexity Sizing based on reference workloads, e.g., sales transact. Performance models Commercial application (not a toy system) ERP has 10 times the lines of code of the Windows operating system Can we define models that are both simple and effective? WOSP/SIPEW 2010, San Jose 6/23
7 End-to-end Performance SAP ERP Application Server SAP ERP Database 1. waiting time 3. WP service User 1 Admission Control (dispatcher) 2. load Work Process 4. db response Database WOSP/SIPEW 2010, San Jose 7/23
8 Performance Model Limited literature on ERP modeling Rolia et al., ROSSA 2009 layered queueing model (LQM) Queueing networks with finite capacity regions (FCRs) FCR = admission control region More general than MVA queueing networks Less expressive than LQMs (e.g., no async behavior) Why FCR queueing networks? Simplest models with admission control Promising for analytical approximations multiclass iterative approximations already available WOSP/SIPEW 2010, San Jose 8/23
9 Performance Model FCR queueing network of SAP ERP Performance evaluated with Java Modelling Tools (JMT) simulator (WPs) WOSP/SIPEW 2010, San Jose 9/23
10 Prediction Accuracy Comparison of model and measurement Over-sizing needed when #WPs close to #CPUs Best performance when #WPs much larger than #CPUs vcpu WPs usrs WOSP/SIPEW 2010, San Jose 10/23
11 Cost Modeling WOSP/SIPEW 2010, San Jose 11/23
12 Modeling Hosting Costs Focus on technical components of TCO Goal: find relation between service demand and costs Hardware costs Parallelism (#cores/cpu) Price (price/core) Usage costs Power consumption Service demand Nominal performance (tpmc/core: TPC-C results) WOSP/SIPEW 2010, San Jose 12/23
13 Cost vs Performance Publicly available data for Intel Xeon DP/MP Tested polynomial, exponential, and power laws Best RSS for power law: WOSP/SIPEW 2010, San Jose 13/23
14 Cost vs Performance vs Cores Cost/CPU: Cost/core: WOSP/SIPEW 2010, San Jose 14/23
15 Modeling Power Consumption Focus on hardware costs and power consumption Normalized power: Butterworth-type law: Flat WOSP/SIPEW 2010, San Jose 15/23
16 Final server cost model static costs hw costs power. costs Traditional data center Consolidated data center WOSP/SIPEW 2010, San Jose 16/23
17 Sizing Framework WOSP/SIPEW 2010, San Jose 17/23
18 Pareto Front Optimization variables Variables: service demands, #cores, software threading lvl Objective functions: min Cost, min Response Time Pareto improvement improve one variable without making any other worse Pareto-optimal point no feasible improvements Pareto front WOSP/SIPEW 2010, San Jose source: wikipedia 18/23
19 SLA Planning Framework WOSP/SIPEW 2010, San Jose 19/23
20 Pareto Front: Results Consolidated data center scenario gold silver bronze WOSP/SIPEW 2010, San Jose 20/23
21 Pareto Front: Results Traditional data center scenario gold silver bronze WOSP/SIPEW 2010, San Jose 21/23
22 Solution Space: Results WOSP/SIPEW 2010, San Jose 22/23
23 Conclusion Quantitative techniques for (semi-)automatic sizing Queueing-theoretic performance model TCO models Multi-objective optimization for decision making Future work Generalization of methodology to arbitrary application Development of analytical approximations for FCR models Validation of power models for ERP applications WOSP/SIPEW 2010, San Jose 23/23
24 Thanks! WOSP/SIPEW 2010, San Jose 24/23
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