java eden space size

Conserving Dynamic Footprint by Minimizing Java Heap Size 4-3 The Young Generation 4-3 Young Generation Size Options 4-3 Survivor Space Sizing 4-4

In other words, the combined size of the eden and survivor spaces will be one fourth of the total heap size Page 7 Types of Collectors Throughput collector: - - XX 

methods reside Also used for String pools JVM Heap Eden Su rvivo r Sp a ce Step 1 – Tune the JVM Heap Size Must also tune the Survivor Space size

heap sizes of a Java application at its launch time Dur- ing run time, the JVM is to change the size of the eden space, where most new objects are allocated

*In Java 8, Permgen memory area is replaced by Metaspace Young Generation - Eden Space ○ Eden Space Always one of the two Survivor spaces is always empty should be around 2048 regions on the minimum Java heap size

To Survivor From Survivor HotSpot JVM Java Heap Layout The Java Heap Eden Make Eden size bigger (assuming same object allocation rate) Changing 

exciding size threshold still may be allocated in young space will never get promoted to tenured space unless survivor Let JVM resize TLABs per thread

Eden Survivor Spaces Tenured Generation Mark - Sweep Collections Copying Collections Figure 1: Heap organisation in the Sun JVM 3 Java Virtual  

The Eden Space of the Young Generation holds all the newly created objects allocated at startup and ‐Xmx is the maximum heap size reserved by the JVM at 

Eden Survivor Spaces Figure 2 2: A Java HotSpot VM heap division Adjusted from [19] sizes of the heap to achieve a smaller memory footprint and to meet a