1. Java performance for Jazz
Using publicly available tools to analyze the behaviour of running CLM installation

2. Topics Tools GC log analysis Thread analysis from javacore files
Heap analysis

3. Tools
GC log analyzer b51838e11
WAIT
Thread dump (javacore) analyzer 14c205f7333c
Heap Analyzer (phd files)

4. GC Overhead as key performance indicator
GC Analysis
Introduce the hursley logs
Demonstrate that even after tuning we still see pauses
GC Overhead as key performance indicator
GC Overhead should stay below 5% if possible Extended periods over 10% are bad Here it’s obvious that the heap is quickly exhausted and cannot recover

5. WAIT Combines info including memory and thread activity
Combines info including memory and thread activity

6. Thread dumps show exactly what the JVM is doing
Thread Analysis
Introduce the hursley logs
Demonstrate that even after tuning we still see pauses
Thread dumps show exactly what the JVM is doing
Which threads are doing what Who is waiting for whom Can be combined with other data from WAIT (more later...)

7. Shows us what Java objects are in Memory
Heap Analysis
Introduce the hursley logs
Demonstrate that even after tuning we still see pauses
Shows us what Java objects are in Memory
Which threads are doing what Who is waiting for whom Can be combined with other data from WAIT (more later...)

8. GC Deepdive

9. GC Exercises