Size of Huge Objects directly allocated to Old Generation

Question

Recently I\'ve been reading about object allocations in different generations in Java. Most of the times new objects are allocated in Eden (part of Young Generation) and the

Answer 1

JVM flags:

-Xms1G -Xmx1G -Xmn500m -XX:PretenureSizeThreshold=100000000 -XX:+PrintGCDetails

By fixing the young generation size to 500MB, eden comes around 384MB, So any object greater than 384MB goes directly into OldGen and object less than 384MB is allocated in Eden itself. You can find the generation usages below

byte[] array = new byte[400*1024*1024];

PSYoungGen      total 448000K, used 30720K  
    eden space 384000K, 8% used  
    from space 64000K, 0% used  
    to   space 64000K, 0% used      
 ParOldGen       total 536576K, used 409600K  
   object space 536576K, 76% used 

byte[] array = new byte[300*1024*1024];

 PSYoungGen      total 448000K, used 337920K  
  eden space 384000K, 88% used  
  from space 64000K, 0% used  
  to   space 64000K, 0% used  
 ParOldGen       total 536576K, used 0K 
  object space 536576K, **0% used** 

For 400MB allocation, eden usage is 8% where as old gen usage is 76% For 300MB allocation, eden usage is 88% where as old gen usage is 0% So its clear that all the objects whose size is greater than the eden will be allocated directly into old gen.

Thanks apangin & Jigar for your valuable insights :)
I think -XX:PretenureSizeThreshold is not considered at all.