[Java] 用YourKit看Java程式的CPU & Memory

YourKit

• 下載點: http://www.yourkit.com/download/
• 可以用10 minutes emial產生一個暫時的email進行YourKit的試用

Step 1: Select monitor application

• Launch your eclipse and YourKit.
• Run your code.
• Your will see your eclipse and running process on YourKit.

Step 2: Capture Memory Snapshot

• Click Capture Memory Snapshot to see memory usage in detail.
• Launch your eclipse and YourKit.

Step 3: Memory Statistics

• You will see memory statistics.
• For example, if you want to see who use char[], we can click "Click to start calculation"

Step 4: Do Memory Calculation

• You can see who use this object (ex: char[]).

Step 5: Object Explore

• You can use "Object Explore" to see data in memory.

Step 6: Paths of GC roots

• In Memory Statistics, right click class (ex: char[])
• Click "Paths of GC roots", you can see the GC status of this object.

References

• YourKit
• Java Profiler - YourKit Java Profiler（一）
• Java Profiler - YourKit Java Profiler（二）