From Reproducibility Problems to Improvements: A journey
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1 From Reproducibility Problems to Improvements: A journey Holger Eichelberger, Aike Sass, Klaus Schmid {eichelberger, schmid}@sse.uni-hildesheim.de sassai@uni-hildesheim.de Software Systems Engineering University of Hildesheim
2 Motivation (1) Trigger: Reproduce a given benchmark SPASS-meter Instrumenting resource monitoring framework Flexible monitoring scope Online aggregation to monitoring groups, MooBench micro benchmark [Waller14]??? 11/23/2016 From Reproducibility Problems to Improvements: A journey 3
3 Motivation (2) Approach Reproduce fluctuations with MooBench Identify / solve problems Measure better results We improved SPASS-meter, but Journey of reproduction problems Still many questions open No confirmation / disproof of Waller! Lessons learned Need for good practices 11/23/2016 From Reproducibility Problems to Improvements: A journey 4
4 Terms Qualitative repeatability Statistically equivalent results In same setup Qualitative reproducibility Statistically equivalent results By third party Probably different setup 11/23/2016 From Reproducibility Problems to Improvements: A journey 5
5 Reproduction (1) Original setup S1 Dell X6270 Blade, 2 Xeon, 24 GB RAM Debian Linux kernel , upgraded libraries (versions) JDK 1.7.0_55 MooBench Recursive test of depth 10 Measure response time 2M calls, discard first half as warmup Repeat 10 times SPASS-meter Narrow-down strategy Problems: Different Hardware Different OS Use most similar machine available Measure with MooBench Successful replication? [no] [yes] 11/23/2016 From Reproducibility Problems to Improvements: A journey 6
6 Reproduction (2) Setup S2 Dell Optiplex 790, Core i5 Quadcore, 8 GB RAM Ubuntu LTS JDK, MooBench, SPASS-meter Better response time Different fluctuations Moving spikes 11/23/2016 From Reproducibility Problems to Improvements: A journey 7
7 Reproduction (3) Setup S3 HP ProLiant ML150, Xeon 5130 Dualcore, 6 GB RAM Debian 7.5, upgraded libraries (version 2.15 vs. 2.23) JDK, MooBench, SPASS-meter Problems: Different data set Different script Different parameters Similar to S2 Response time x 3 No big spikes 11/23/2016 From Reproducibility Problems to Improvements: A journey 8
8 Outlier analysis Root cause analysis with micro benchmarking (MooBench) Phase 1 Identify potential triggers Modify setup / SPASS-meter Re-run MooBench Phase 2 Extend MooBench for further performance dimensions 11/23/2016 From Reproducibility Problems to Improvements: A journey 9
9 Outlier analysis Phase 1 Potential causes Hardware Operating system: Swapping JVM: Garbage Collection MooBench: Benchmark test SPASS-meter: Instance pooling Data structures Online aggregation No clear indication for the root cause JMX call ThreadMXBean.getThreadCpuTime()???? 11/23/2016 From Reproducibility Problems to Improvements: A journey 10
10 Outlier analysis Phase 2 Extend MooBench for memory consumption Measure before / after test JVM memory Number of garbage collections Log differences JMX call ThreadMXBean.getThreadCpuTime() 11/23/2016 From Reproducibility Problems to Improvements: A journey 11
11 Improving SPASS-meter?????? Response time improvement SPECjvm2008 overhead / 2 11/23/2016 From Reproducibility Problems to Improvements: A journey 12
12 Conclusions Reproducing benchmark results is difficult Not able to reproduce the original results Improved SPASS-meter through MooBench 11/23/2016 From Reproducibility Problems to Improvements: A journey 13
13 Lessons learned Small differences in setup can lead to huge result differences Detailed information on OS setup / configuration needed Archive as ISO image Publish result sets Figures can be misleading Archive the analysis scripts, parameters Publish statistical summaries of results Version analysis scripts with result sets and setup Automate experiments Use the same hardware. VMs? Raspberry Pi? Go for cloud? All our pieces are online. We need good practices! Legal issues? 11/23/2016 From Reproducibility Problems to Improvements: A journey 14
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