Tracking size of object in JVM

Hi
How do i find out which objects are taking memory in JVM.

Get a heap dump in HPROF binary format using jmap or the new HotSpotDiagnostic MBean through JConsole if your Java application is running on JDK 6 and then analyze it with the jhat tool in JDK 6 or the new HeapWalker in NetBeans 6. NetBeans 6 can also be used to get a heap dump.
For more detailed info have a look at the Hands-On Lab I presented at JavaOne 2007 about troubleshooting Java applications:
http://developers.sun.com/learning/javaoneonline/sessions/hol2007/1420/jmxjconsole/index.html#Exercise_2_5
Regards,
Luis-Miguel Alventosa
Java SE JMX/JConsole development team
Sun Microsystems, Inc.
http://blogs.sun.com/lmalventosa/

Similar Messages

How to change Font Size of Object Explorer in "SQL Server Management Studio"

Dear Team,
"SQL Server Management Studio" is a fantastic IDE for the database.
There are so many customization options available but one thing many users missing is that " How to change Font Size of Object Explorer?"
Can you please accumulate this feature in IDE ASAP?
Many Thanks,
Bhavesh

Its there
Go to Tools -> Options
Then under Environment you've fonts and colors tab where you can specify a higher font size.
Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
My Wiki User Page
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RE: Size of Objects

Try the Forte trace flag, trc:os:5:5.
It will tell you the size and number of objects in memory.
(Note: I don't think it well put together your entire object graph
for you.
(e.g. If you have pointers to other complex objects hanging
off of your object, I don't believe they are reflected in the
object size.)
Hope this helps!
-----Original Message-----
From: [email protected]
[<a href="mailto:[email protected]">mailto:[email protected]]On</a> Behalf Of
[email protected]
Sent: Thursday, October 01, 1998 12:55 PM
To: [email protected]
Subject: Size of Objects
I am trying to find the size of an object in memory. Can someone tell me
what the best way is?
If I store the object in a MemoryStream, the Size() method return the
total bytes in the stream, but
does this correspond to the size of the object in memory?
Regards,
Peter Kelly
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I used to serialize the object and inspect the size of
the file.
This way it worked fine for me.
Hope this helps!
Ajith Kallambella M
Forte Systems Engineer,
International Business Corporation.
I am trying to find the size of an object in memory.Can someone tell me
what the best way is?
If I store the object in a MemoryStream, the Size()method return the
total bytes in the stream, but
does this correspond to the size of the object inmemory?
Regards,
Peter Kelly-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive<URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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How to view the physical size of objects

Hi
Please advise how to view the physical size of objects like tables, indexes, materialize views etc.
Wishes
Jawad

To see the physical size of objects like tables, indexes, use
USER_SEGMENTS where SEGMENT_TYPE=table/index/partition etc.
But for views/packages/java/trigger, you can only see rough estimate in USER_OBJECT_SIZE

Still not supporting relative size of objects?

Hi everybody!
Am I blind? Just downloaded and installed iWork '09, hoping they added the possibility to adjust the size of objects like pictures in a relative manner, finally.
Let's say, you have some screenshots for creating a documentary. All of different sizes. You want all of them to appear in your Pages document at 50 % of their original size. How can you manage this? I still didn't find a way for this simple task.
Have I really to use Word for Pages can't help me with this?
Regards,
Olaf

Apple deliver with the operating system several scripts allowing us to manipulate our pictures.
Here is one of them edited to divide the pictures dimensions by two.
--[SCRIPT Half_size}
property done_foldername : "Reduced Images"
property originals_foldername : "Original Images"
property newimage_extension : "jpg"
-- the list of file types which will be processed
-- eg: {"PICT", "JPEG", "TIFF", "GIFf"}
property type_list : {"TIFF", "GIFf", "PNGf", "PICT", "JPEG"}
-- since file types are optional in Mac OS X,
-- check the name extension if there is no file type
-- NOTE: do not use periods (.) with the items in the name extensions list
-- eg: {"txt", "text", "jpg", "jpeg"}, NOT: {".txt", ".text", ".jpg", ".jpeg"}
property extension_list : {"tif", "tiff", "gif", "png", "pict", "pct", "jpeg", "jpg"}
on adding folder items to this_folder after receiving these_items
tell application "Finder"
if not (exists folder done_foldername of this_folder) then
make new folder at this_folder with properties {name:done_foldername}
end if
set the results_folder to (folder done_foldername of this_folder) as alias
if not (exists folder originals_foldername of this_folder) then
make new folder at this_folder with properties {name:originals_foldername}
set current view of container window of this_folder to list view
end if
set the originals_folder to folder originals_foldername of this_folder
end tell
try
repeat with i from 1 to number of items in these_items
set this_item to item i of these_items
set the item_info to the info for this_item
if (alias of the item_info is false and the file type of the item_info is in the type_list) or (the name extension of the item_info is in the extension_list) then
tell application "Finder"
--set name of this_item to "YK#" & (text -4 thru -1 of ("0000" & i))
my resolveconflicts(thisitem, originals_folder, "")
set the new_name to my resolveconflicts(thisitem, results_folder, newimage_extension)
set the source_file to (move this_item to the originals_folder with replacing) as alias
end tell
processitem(sourcefile, new_name, results_folder)
end if
end repeat
on error error_message number error_number
if the error_number is not -128 then
tell application "Finder"
activate
display dialog error_message buttons {"Cancel"} default button 1 giving up after 120
end tell
end if
end try
end adding folder items to
on resolveconflicts(thisitem, target_folder, new_extension)
tell application "Finder"
set the file_name to the name of this_item
set file_extension to the name extension of this_item
if the file_extension is "" then
set the trimmed_name to the file_name
else
set the trimmed_name to text 1 thru -((length of file_extension) + 2) of the file_name
end if
if the new_extension is "" then
set target_name to file_name
set target_extension to file_extension
else
set target_extension to new_extension
set target_name to (the trimmed_name & "." & target_extension) as string
end if
if (exists document file target_name of target_folder) then
set the name_increment to 1
repeat
set the new_name to (the trimmed_name & "." & (name_increment as string) & "." & target_extension) as string
if not (exists document file new_name of the target_folder) then
-- rename to conflicting file
set the name of document file target_name of the target_folder to the new_name
exit repeat
else
set the name_increment to the name_increment + 1
end if
end repeat
end if
end tell
return the target_name
end resolve_conflicts
-- this sub-routine processes files
on processitem(sourcefile, new_name, results_folder)
-- NOTE that the variable this_item is a file reference in alias format
-- FILE PROCESSING STATEMENTS GOES HERE
try
-- the target path is the destination folder and the new file name
set the target_path to ((results_folder as string) & new_name) as string
with timeout of 900 seconds
tell application "Image Events"
launch -- always use with Folder Actions
set this_image to open file (source_file as string)
scale this_image by factor 0.5
save this_image as JPEG in file target_path with icon
close this_image
end tell
end timeout
on error error_message
tell application "Finder"
activate
display dialog error_message buttons {"Cancel"} default button 1 giving up after 120
end tell
end try
end process_item
--[/SCRIPT]
If you don't know the way we use that, enter the Finder's Help and search for "folder action".
Yvan KOENIG (from FRANCE vendredi 16 janvier 2009 20:26:11)

Determining size of objects

hi , is there any way we can determine the size of objects in java ,like we have sizeof() in C. because till now I have only found functions in runtime class to determie the mem. as total OR max. OR free

In Java 1.5 is the Instrumentation package which can provide something like Object sizes. Never used it myself, though.

RE: RE : Size of Objects

According to Forte, the size of serialized object is smaller that object
size in the memory (in particular due to overhead necessary to support
garbage collector).
There is a way to calculate object size more or less precisely, but it
fairly complex and definitely undocumented. I'm not sure that I will
remember everything correctly (it was 1.5 years ago), so if somebody has
more up-to-date knowledge, please correct any errors.
There is, special flag cfg:?? (I do not remember it exactly), which
allows you to invoke so-called INTERNAL methods. One of such methods is
method getSize() on class Object. You can use it to receive object size
in the memory. After that you need to add all memory taken by object
simple type attributes, including implicit ones (e.g. for TextData
object you need execute getSize() and add result of getAllocatedSize(),
because string itself stored as separate entity). Result must be rounded
by modulo 8 and after that you need add another 8 bytes for garbage
collector information. After that you need calculate such size for all
complex attributes which are objects themselves.
Hope this will help.
WBR,
Nick Sakharov
CBSI
From: Ajith Kallambella M[SMTP:[email protected]]
Reply To: Ajith Kallambella M
Sent: Thursday, October 01, 1998 2:34 PM
To: [email protected]; ForteUsers
Subject: RE : Size of Objects
I used to serialize the object and inspect the size of
the file.
This way it worked fine for me.
Hope this helps!
Ajith Kallambella M
Forte Systems Engineer,
International Business Corporation.
I am trying to find the size of an object in memory.Can someone tell me
what the best way is?
If I store the object in a MemoryStream, the Size()method return the
total bytes in the stream, but
does this correspond to the size of the object inmemory?
Regards,
Peter Kelly-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive<URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive
<URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

I used to serialize the object and inspect the size of
the file.
This way it worked fine for me.
Hope this helps!
Ajith Kallambella M
Forte Systems Engineer,
International Business Corporation.
I am trying to find the size of an object in memory.Can someone tell me
what the best way is?
If I store the object in a MemoryStream, the Size()method return the
total bytes in the stream, but
does this correspond to the size of the object inmemory?
Regards,
Peter Kelly-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive<URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

'Track Size' in Behaviors Tab

Hey guys,
I just installed FCS2, and I've been reading up on some of the tracking procedures. In the behaviors tab after adding 'Analyze Motion' to my source footage, I don't have the 'Track Size' parameter. In video tutorials, I've found it directly above the Search Size parameter, which I have. But directly above it is the Position parameter. Does anyone know how I can fix this? Thanks.

Is your install up to date? (3.02)

Vertical track size

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I have a strange problem that only happened on one song. I clicked on "show automation" and, as it should, the vertical track size expanded showing the automation stuff. When I clicked again to hide the automation stuff, the track size remained the same (expanded size) and it doesn't go back to the normal size. It is obviously some kind of bug, any idea on how i can fix this as it's kind of annoying to work on a song with this view.
I thought about starting a new projects and importing the single tracks as you can do on other programs but I don't think it is possible on GB. Anyone have a solution?

I had the issue too. FIrst I thought it was a hidden feature but I couldn't find anything todo that on purpose, so it might be a bug.
Hope that helps
Edgar Rothermich
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

How Can i Count the objects in JVM

Hi,
i wanted to count the number of objects in JVM, and get some preformance information in it.... I dont want to use a Profiler to do that because i just wanted few information from the production machine... we dont want addtional work for the VM.... just wanted to write a small app which can do it... without changing any addtional settings in the existing app....
The goal was to create a URL which will return a XML of this data which will be collected from multiple machine and consolidated for performance and capacity....
Any help or direction to an set of API's will help.....
Thanks and Regards
Vijay

Try jconsole to see if it does what you need. Visualvm in update 10 is another good tool.
--Ray

Finding Objects in JVM

Hi,
Is there a way by which I can get a reference to any object in JVM?
OR
Is there way I can get reference to all the active object instances that are currently available in the JVM ?
OR
Is there a way I can get a reference of all the objects active of a given class in JVM?
For Example :
class A {
static void main(String args[])
String str = new String("Test");
class FindAObject {
static void main(String args[])
String strObjFound = (String) getReferenceOfObject("str");
Object getReference(String objName)
/*Steps/API call to get reference to "str" object of Class A*/;
Here I am assuming that both the classes A and FindObject are active in JVM at a given time. Its really not important to find object by name ... Any other way to find objects will do.
In one of the threads on one of the forums, I read that analyzing how various Garbage Collectors work can help ... but could not get my hands on any GC implementation.
Thanks,
Vinayak

Is there a way by which I can get a reference to any object in JVM? You need to have a reference to it or something which has a reference to it etc.
Is there way I can get reference to all the active object instances that are currently available in the JVM ?No.
Is there a way I can get a reference of all the objects active of a given class in JVM?No. You can keep this list if you need it however.
It sounds like what you need is either a debugger or a profiler.

How to track a mobile object, masking the others?

Hi
I work with spherical objects with a dimeter size equal to 100 micrometers. The objects are immersed in a fluid. They are movable, swimming in the fluid. I would like to track one of them, masking the others. Could somebody give me an advise how to do it?
Regards

Hello,
sincu you did not attach any images it's hard to say, but check this out (a toolkit i've made, wrapping various OpenCV functions):
https://decibel.ni.com/content/blogs/kl3m3n/2014/09/05/point-cloud-library-pcl-and-open-computer-vis...
You could use camshift/meanshift tracking based on hue-saturation histogram backprojection, or perhaps you could just try masking your image with backprojection only.
Spherical - since you are processing in 2D space, you can also try using Hough circle transformation to detect the circles and track them on subsequent frames using for example Euclidean distance from detected centers as your criteria.
Can you post a sample image?
Best regards,
K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

How to find out size of objects

hi, i need to draw a few objects in PS - a few rectangles and circles, and i need to draw them with precise size - width and height, but i dont know where i can find some information about their width and height (in cm or mm). once i draw them, there's nothing about their size in the panel or properties. thanks

A way to measure pretty much anything is to select the Ruler tool, then drag from one side to the other...
Once you've set the endpoints, you can read the results near the top of the Photoshop main window. It will read out in whatever units you've set in Edit - Preferences - Units & Rulers
-Noel

Need help on -- Size of object

how do i get the size of the object ?
Thanks in Advance

You can't. What makes you think you need this, because in Java we don't need to worry about this. You do not explicitly allocate or free memory, so the size of an object is not needed. Some people will tell you to serialize an object to a byte array and that the size of the array is the size of the object, but they're completely wrong. The size of an object is, roughly, the size of every primitive field it has, plus the size of a reference to an object multiplied by the number of reference fields, plus a small overhead for simply existing itself. But as I said, you don't need to worry about it

Can I get the reference to all objects in JVM Heap?

Hello,
Thanx in advance for reading (and replying) to this problem.
I need to find an object whose reference I dont have.
I feel the best place to search for is the JVM heap.
If I get that JVM heap, and am able to get all the objects created, I can locate the particular object that I am looking for.
Is there a way to od this????
Any suggestions ????
Vikas

JVMTI will mostly help you in this case. But i recomend you to review you application design, because such services are unsafe and rather tricky.

Tracking size of object in JVM

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