2.1 GC Tuning

1. GC Tuning Steps

1.1. Determine the Goal of GC Tuning

• CPU utilization: to what extent does the collection algorithm slow down the program? Sometimes this is described as the percentage of CPU time occupied by collection versus other CPU time.
• GC pause time: how long will the collector pause the program? In current GC, pauses that may be caused by both STW and Mark Assist need to be considered.
• GC pause frequency: how frequently does the collector cause pauses? In current GC, pauses that may be caused by both STW and Mark Assist need to be considered.
• GC scalability: how does the garbage collector perform as heap memory grows? Most programs may not necessarily care about this issue.

1.2. Observe GC

1.3. Tuning

1.3.1. Tune Parameters

1.3.2. Tune Code