JAX London presentation 2014

1. Hands-on Performance Workshop
The science of performance
Mike Croft

2. Who Am I?
• C2B2 Expert Support consultant
• Ex-IBM
• Snowboarder
• @croft

3. Who are you?

4. Why are we here?
• Hands-on performance!
– Hands on what?
• See what tools are available
• Get experience of using some tools
• Learn how to apply knowledge
• Why do you want to be here?

5. Agenda
• Introduction
• Environment setup
• Performance Overview
• Collecting Data
– Presentation
– Practical
• How do we interpret the data?
– Tools
• Example app analysis

6. Environment Setup
Hands-on Performance Workshop

7. Environment Setup
• Download Instructions and follow the first part
https://s3-eu-west-1.amazonaws.com/jaxlondon2014/instructions.docx
• Make sure all necessary resources are downloaded
• Make sure the app is deployed and JMeter can run
load through it

8. Performance Overview
Hands-on Performance Workshop

9. Performance Overview

10. Performance Overview
Performance Factors
• Raw Algorithmic Performance
• Resource Limitations
– Not enough cpu, disk, memory
• Resource Contention
– Locks
• IO Latency
– Network, Disk

11. Performance Overview
Latency Factors
• Network Distance
• Network Reliability
• Data Size
• Operation Granularity
• Resource Contention
• JVM GC

12. Performance Overview

13. Performance Overview

14. Collecting Data
Hands-on Performance Workshop

15. Collecting Data
• Garbage Collection
• Verbose GC
• Heap size
– New size and old size
– Before collection
– After collection
• Pause time

16. Collecting Data
• Thread dumps
– Kill -3
– JStack
• Thread state
– Wait
– Sleep
– Blocked
– Running
• Full stack trace

17. Collecting Data
• Heap dumps
• Entire contents of the heap
– Very Large!
– Can take time to collect on large
heaps
• Can auto-dump on OOME

18. Interpreting Data
Hands-on Performance Workshop

19. Interpreting Data
• Tools
– Live monitoring
• VisualVM
• MissionControl
• JMX
– Historical analysis
• Memory Analyzer Tool
• Flight Recorder (commercial)
• Threadlogic
• GCViewer