Re: [OT] how to calculate the size of an object

[Brian Lee]

If you run this from a simple console test app, the JVM won't allocate any 
extra objects between 2 and 4.

Unfortunatly, this is the most exact way to find out memory usage 
(serialization size doesn't necessarily mean in memory size).

Just wait til those slackers at Sun at a Object.sizeof() method in jdk1.9 or 
something lame.

BAL
From: Navjot Singh <[EMAIL PROTECTED]>
To: Struts Users Mailing List <[EMAIL PROTECTED]>
Subject: Re: [OT] how to calculate the size of an object
Date: Thu, 08 Jul 2004 22:16:12 +0530
hi,
Thanks for the link but this is very naive way of doing it. I am leaving it 
to the mercy of gc.

What this method is doing
1. run gc() manually (AND hope it wont run automatically again soon.)
2. free memory
3. create and object.
4. free memory
and now just wish that JVM wont allocate any memory in it's heap between 
steps 2 & 4. so that one can assume that whatsoever output comes belongs to 
my object. I am at something better.

Jim you are absolutely right, this technique may return a negative number.
navjot singh
[EMAIL PROTECTED] wrote:
http://www.google.com/search?hl=en&lr=&ie=UTF-8&q=size+java+object
The first one looks promising.
Dennis

*Navjot Singh <[EMAIL PROTECTED]>*
07/08/2004 11:57 AM
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        [OT] how to calculate the size of an object



hi,
I use SAX parser to load an LDIF file into memory. Whatsoever data i
read, i fill into an object.
I need to know *the size of LDIFData object* at runtime. How to do that?
Well the class structure is something like this
public class LDIFData{
                ArrayList cards; // collection of Card
                String filename;
                long lastLoadedTime;
}
public class Card{
                String name;
                String email
                String mobile;
}
--
regards
Navjot Singh
When you jump for joy, beware that no-one moves the ground from beneath
your feet. -- Stanislaw Lem, "Unkempt Thoughts"
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--
regards
Navjot Singh
When you jump for joy, beware that no-one moves the ground from beneath
your feet. -- Stanislaw Lem, "Unkempt Thoughts"
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