How much memory each session on HPUX

Hi
Can any one let me know following below ,
1. How to calculate how much memory consumed by each oracle session on dedicated server configuration.
2. Using the top command on HPUX 11.11
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
1 ? 4203 oracle 148 20 70208K 5300K sleep 3:24 31.21 31.15 oracleCD_PR
1 ? 5482 oracle 154 20 74304K 11580K sleep 0:51 18.23 18.19 oracleCD_PR
From the above output of top command SIZE= 70208K
is that value correct of memory used by single session ?.
Thanks

You can metalink doc
Script: Listing Memory Used By All Sessions
Doc ID: Note:1070975.6
for a statement to report session memory usage.
Since all the Oracle sessions/processes linked to same share memory, top memory usage report is not accurate.
For HPUX you can use glance to determine real memory usage.
Diagnosing Oracle memory on HP using GLANCE
Doc ID: Note:166490.1

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Via making an internet lookup and writing some code, i made an implementation of
how to calculate how much memory an object consumes. This is a tricky way.
However, how can i achieve a better and direct way? Is there a tool for attaching
to JVM and viewing the memory locations and contents of objects in memory?
I wrote the tricky way to Javalobby and pasting the same explanation to here too.
I must say that this tricky way does not belong to me, and i noted where i took
the main inspiration etc. at the end.
Because of the underlying structure Java does not let
users to access and directly change the content of
instances in memory. Users could not know how
much memory is used for an object, like in C.
However this tricky method lets them to know in an
indirect way.
To achieve how much memory is used for an object we must
calculate the used memory before and after the object is
created.
MemoryUsage.java
* User: Pinkman - Fuat Geleri
* Date: Mar 20, 2005
* Time: 11:13:50 AM
* The class which makes the calculation job.
* Calculating the difference of used memory
* between calls
* "start()", and "end()".
* So if you initiate an object between those
* calls you can get how much memory the object
* consumed.
* Initial inspration from
* http://javaspecialists.co.za/archive/Issue029.html
public class MemoryUsage {
     long usage;
     public void start(){
          garbageCollect();
          Runtime r=Runtime.getRuntime();
          usage=r.totalMemory()-r.freeMemory();
     public long end(){
          garbageCollect();
          Runtime r=Runtime.getRuntime();
          return (r.totalMemory()-r.freeMemory())-usage;
     public String memorySizeToString(long l){
          int MB=(int) (l/1048576);
          l=l-1048576*MB;
          int KB=(int) (l/1024);
          l=l-1024*KB;
          return new String(MB+"MB "+KB+"KB "+l+"BYTES");
     private void garbageCollect() {
          Runtime r=Runtime.getRuntime();
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          r.gc();r.gc();r.gc();r.gc();r.gc();
          r.gc();r.gc();r.gc();r.gc();r.gc();
Therefore the first file MemoryUsage.java is coded.
It simply calculates and stores the used memory when
start() method is called. After generating some objects,
the end() method is called to get the
difference between memory usages, between the start()
and end() method calls.
SizeOf.java
import javax.swing.tree.DefaultMutableTreeNode;
import java.util.List;
import java.util.ArrayList;
import java.util.Random;
* User: Pinkman - Fuat Geleri
* Date: Mar 20, 2005
* Time: 6:02:54 PM
* Arbitrarily size of objects in JAVA..
* An example of getting how much an
* object consumed in memory.
* Like
* primitives -> does not consume any
* arrays -> consumes 16 bytes when empty
*   ex: byte []a=new byte[0];
* list    -> consumes 80 byte when empty..
* references -> when did not initiated does
* not consume any memory!.
* Initial inspration from
* http://javaspecialists.co.za/archive/Issue029.html
public class SizeOf {
     MemoryUsage mu=new MemoryUsage();
     public static void main(String []args){
        SizeOf s=new SizeOf();
          s.sizeOfExample();
     //remove the comments in order to make the same checking by yourself..
     private void sizeOfExample() {
          mu.start();
          //byte []b=new byte[0];//<-byte array 16byte,each byte addition equals 1 byte!!
          //String s="How much memory is used?";//string consumes no byte!!
          //byte c=20; //<-consumes no memory!!
                //Object o=new Object();//object consumes 8 bytes..
          //Object []oa=new Object[100];//<-object array consumes 16 byte! and each addition object 4 bytes!
                //List list;//non initialized object consumes no memory!!..
          //Integer i=new Integer(1);//an integer object consumes 16 bytes!
          //List list=new ArrayList();//An array list consumes 80 bytes!.
          /*for(int i=0;i<10;i++){ //An array list + 10 integer consumes 240 bytes :)
               list.add(new Integer(i));
          Random r=new Random();
          byte []rand=new byte[1];
          int count=100000;
          List list=new ArrayList(count);
          for(int i=0;i<count;i++){
               r.nextBytes(rand);
               list.add(new String(rand));//empty string occupies no memory??
          DefaultMutableTreeNode root=new DefaultMutableTreeNode();//8 byte when single!.
          Random r=new Random();
          byte []rand=new byte[10];//when this is one and count is 1 million memory gets overfilled!..
          int count=500000;
          for(int i=0;i<count;i++){
               r.nextBytes(rand);
               root.add(new DefaultMutableTreeNode(new String(rand)));
          long l=mu.end();
          System.out.println(""+mu.memorySizeToString(l));
An example usage can be found in the second file
SizeOf.java. Simply remove the comments,"//", and execute
to see how much memory used.
For example:
% Primitives does not consume any memory.
% Non-initialized object references does not consume
any memory.
% Empty string and most of the small strings does not consume any memory.
% Empty byte[] consumes 16 bytes.
% Empty ArrayList consume 80 bytes.
% An Integer object consumes 16 bytes.
% Empty DefaultMutableTreeNode consumes 8 bytes..
and so on.
You can find the mentioned files in the attachments.
I heard the idea of -how much memory is used- from
Prof. Akif Eyler, and i got the main inspration from
the site http://javaspecialists.co.za/archive/Issue029.html
//sorry about my mistakes, and everything :)
Thanks for your answers beforehand.

Any good profiler will tell you.
You can also code your own using jvmpi or jvmti.
Also note that calling System.gc is a hint to the jvm it may or may not respect your wish.
Test it with a few different gc algorithms and see what happens.
/robo

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Acmcneill1ug 14, 2014 7:16 AM I have IMac OSX 10.9.4, 4GB,Processor 3.06 with Intell2Duo. I would like to check for Malware. I run a TechTool Pro 6 every month and that comes up great. When check how much memory I am using, with only Safar

Acmcneill1ug 14, 2014 7:16 AM
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