heap « performance « Java Testing Q&A

1. Java very large heap sizes    stackoverflow.com

Does anyone have experience with using very large heaps, 12 GB or higher in Java?

• Does the GC make the program unusable?
• What GC params do you use?
• Which JVM, Sun or BEA would ...

2. Finding objects having same values in heap dump    stackoverflow.com

I want to reduce number of objects in memory. There may be many objects having same values. Is there way to find out all the objects which has same values in ...

3. Memory space required for a Static String constant in Java?    stackoverflow.com

How much memory will JVM Allocate to 1) Static String 2) Static Integer I am exploring this issue as I am getting Heap Memory Out of Memory Exception, I have in my application 8 ...

4. Perm space vs Heap space    stackoverflow.com

First, What is the difference between Perm space and Heap space (What and how does the JVM choose to use each memory space)? Second, but most importantly, what sort of ratio would ...

5. Java Heap Space Error, OutofMemory Exception while writing large data to excel sheet    stackoverflow.com

I am getting Java Heap Space Error while writing large data from database to an excel sheet. I dont want to use JVM -XMX options to increase memory.

Following are the ...

6. java memory performance - strange behaviour (or is this normal?)    stackoverflow.com

Hi there I would like to start by saying that i'm a beginner, but i'm working on a really small and simple Java app, that really shouldn't cause some major problems. I was ...

7. Performance issue in production    stackoverflow.com

Hi I am working on a web based java tool. We have two instances of our tool deployed in 2 separate servers – one in production (used concurrently by many customers) ...

8. 'Shared Object Memory' vs 'Heap Memory' - Java    stackoverflow.com

What is difference between 'Shared Object Memory' and 'Heap Memory' in Java. Is it like 'Shared Object Memory' is superset of 'Heap Memory'? The source of this question is documentation of jmap. ...

9. IBM Heap Analyzer - finalize method    stackoverflow.com

The following screenshow is taken from IBM Heap Analyzer. I want to understand the difference between 'Number of Objects with Finalize() method' and 'Number of garbage objects ...

10. java heap analysis with oql: Count unique strings    stackoverflow.com

Im doing a memory analysis of an existing java software. Is there a sql 'group by' equivalent in oql to see the count of objects with same values but different instances. select ...

11. Performance vs heap space    forums.oracle.com

Hi, Consider you got a large image(maybe 1000 x 1500 px). If you want to do some operations on it is it for performance reason better to use a List of Lists for the pixelvalues of the image? If i use a two dimensional array i got to use a for loop. This is not very clever cause the arraypointer begins ...