Monitoring memory space in JVM

anybody know about how i see the memory status in java virtual machine.
is there any free software is available for that.
helppping me

thank u so much for answering my question. my problem is solved.
but there is one more problem that is jconsole and visualvm is work
under above the jdk1.4. then how i see the memory status in jdk1.4

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Memory Allocation to JVM

Hi
How do I allocate Contiguous memory space to JVM 1.3 in Windows and AIX?
Regards
Sudhindra

Hi
You are right. But the issues here is performance
enhancement. I feel that when we are talking about
huge volumes of data and transaction performance will
be enhanced if the memory allocated is contigous.
As far as I know all modern platforms use virtual addressing. The overhead of that applies regardless of layout of physical memory. So I am not sure how contiguous blocks would help.
So can you please tell me how to do this? Where can i
get more information about this?
Like I said maybe it is specific to your platform. If so you need to look to the docs about your platform. And the only way you are going to get any advantage from java objects from that is if you write your own jvm.

What's in the JVM Process's Memory Space?

Hello
I'm noticing the following behavior on an NT system. On
application startup, I see
Total Heap 9 MB
Used Heap 5.5 MB
java.exe memory (from NT Task Manager) 36 MB
After a "login" operation which loads a few more
classes:
Total Heap 12.5 MB
Used Heap 8.2 MB
java.exe memory (from NT Task Manager) 53 MB
Heap memory leaks have been ruthlessly suppressed
(thanks to OptimizeIt and careful programming). The
behavior I do not understand is that the NT process
(java.exe) increased in size by 17 MB when the Java
heap increased by only 3 MB. The .jar file in which the
application resides is less than 1 MB, so this 14 MB
growth can not be attributed to new classes being
loaded.
Does anyone know what is going into the process
memory space of java.exe? It tends to grow larger
and larger.
Should I even care? Do I want a large allocation of
process memory for java.exe, or will that hamper
performance of machines with less physical memory?
Posts on related topics in this forum have sometimes
advocated allocating a lot of memory to the JVM with
-X options.
Thanks

Hello
I am facing exactly the same problem on NT. However, on 2000 Server this problem doesn't seem to exist. Are you, by any chance, using JNI? We are extensively using JNI in our Servlets and found that there is definitely some momory leak there. We could not figure out any substantial leak at Java end. In NT's "Task Manager" java.exe is always listed first and very rarely the memory usage seems to come down. On 2000 Server the performance is far better.
Please visit this link:
http://forum.java.sun.com/thread.jsp?forum=33&thread=211330
Regards
Manish Bhatnagar

How to monitor memory usage of "Memory-based Snapshot" executable (MRCNSP) in Linux?

We have noticed in the past that MRCNSP/Memory-based Snapshot program executable consumes around 3.8 GB of memory on the linux VM. I understand that value change planning is 32 bit executable so 4 GB is the limit. I want to monitor the memory usage of the executable when the program runs. The program usually runs overnight. I wanted to check with you experts if you have any MRP executable memory usage monitoring script that I could use.
I found the metalink note OS Environment and Compile Settings for Value Chain and MRP/Supply Chain Planning Applications (Doc ID 1085614.1) which talks about "top -d60 >>$HOME/top.txt". Please share your ideas for monitoring this process.
We do not use Demand Planning or Demanta or Advanced Supply Chain Planning which are 64 bit application. That is our future direction.
Environment:
EBS : R12.1.2 on Linux. The concurrent manager is on 64 bit linux VM, web services on 32 bit VMs.
DB: Oracle DB 11.2.0.3 on HP UX Itanium 11.31. Single database instance.
Thanks
Cherrish Vaidiyan

RAM on the controller is not the same as the C: drive. With respect to the controller, you can think of it in the same terms as your computer. RAM is volatile memory and your C: drive is non volatile flash memory.
Depending on the frequency of the temperature excursions above and below your 70C threshold, the service life of the controller and the method you used to append to the file, there could be a number of issues that may creep up over time.
The first, and the one you brought up is the size of the file over time. Left unchecked this file could grow continuously until the system literally runs out of flash memory space and chokes. Depending on how your are appending data to this file, you could also use more than a trivial slice of processor time to read and write this big file on disk. While I have not personally ever run one of the RT controllers out of "disk space", I can't imagine that any good could come of that.
One thought is to keep a rolling history of say the last 3 months. Each month, start a new file and append your data to it during the course of the month. Each time a new file is created, delete the data file from something like 3 months ago. This will ensure that you will always have the last 3 months of history on the system, however the monthly deletion of the oldest data file will limit you to say 3 files at whatever size they happen to be. Unless there are hundreds of thousands of transitions above and below your threshold this should keep you in good shape.
I also eluded to the method you use to write to this file. I would ensure that you are appending data using the actual file functions and not first reading in the file, appending your data as a string then writing the entire file contents back to disk. In addition to causing the highest load on the file system this method also has the largest system RAM requirements.

Memory space using a 32bit Java process on Redhat Linux

I have a java process that I need a lot of memory for. Its a 32 bit process, and I have no desire to have it as 64bit due to the huge pointers it forces.
So I know I can turn to Solaris where I will have close to 4GB of memory available for this process (right?). But are there Linux alternatives? I am especially curious regarding Redhat on intel64 machines as I have (which is the common desktop hardware nowadays).
I heard about the hugemem kernel for Redhat, but I am lost understading its nature. It is said it is not available for v.5 for x86. So is it available for the intel64 processors as I have? And what is the max memory space for a java process?
Any other bit of information about java 32bit process running on a linux flavor on an intel64 machine will be greatly appreciated.
thanks in advance!
Woody
Message was edited by:
Woody.Benoty

I'd say this is normal. There are a few things to consider when looking at an application like this:
1. The 14 MB your process consumes include the memory required to load the java virtual machine. That is, all the base classes, native links, the just in time compiler etc. 14 MB isn't a lot, all things considered.
2. When you display a message box, java will load additional classes and resources. They increase the heap size, though not really by 4 MB. Java preallocates portions of memory for the heap. If, for instance, your application consumes 16 MB of memory and you allocate another MB, the heap size may grow to 32 MB. Having a free section of heap space to spare increases performance, since java won't have to ask the underlying system for free memory every you create an object. You might want to check out your program in JVisualVM (deployed with every JDK6), which will tell you how much of the allocated heap size is really in use, or you can rely on the according methods in the Runtime class.
3. The JVM is capable of 'heap shrinking', meaning it will return allocated sections of memory to the OS once in a while. However, it will not do so unless the heap size is significantly larger than the used portion of the heap (otherwise, it would defeat the purpose of preallocating memory). So if you allocate 2GB of RAM when clicking your button and allow this memory to be cleared by the garbage collector, you'll observe that the heap will shrink again eventually.

Activity Monitor -- Memory. Details Needed.

Could anyone point out what exactly the "Free" and "Inactive" memory spaces are??
I'm running on a 2GB RAM MacBook Pro. I don't run too many mem intensive programs. But quite often the "Free" mem would drop to 100-150 MB. But at that point, the "Inactive" mem would be around 500-600 MB. So what exactly a I looking at? Am I facing a mem crunch?
I'm new to OSX. from my previous experience with Windows OSes, how much ever RAM you give it, the OS will take a huge chunk and then free up as necessary. Is it something like that that I'm looking at over here? Or am I supposed to go for a mem upgrade?
And I know the next question is might be out of place, but, after quite wome time of browsing on Firefox, it seems to take 500+ MB of RAM. Is that normal??
Thanks in advance for your replies & suggestions.

About OS X Memory Management and Usage
Reading system memory usage in Activity Monitor
Memory Management in Mac OS X
Performance Guidelines- Memory Management in Mac OS X
A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
It's not abnormal for browsers to eventually use a huge amount of RAM. Use the latest version of your browser that's available. Emptying some of the browsers caches like the History cache will help somewhat, but the best way to recover the memory is to quit then relaunch the browser - or just don't worry about it and put more RAM in your computer.

Monitor memory percentage

Hello,
i want to monitor memory % usage on some of the servers where i work. i tried looking for answers to my questions online, but couldn't find such for most questions so i'll try here.
1) i see the "percentage of committed memory" monitor, which is want to use, is by default disabled for all classes except windows server 2000 OS. is that normal?
2) when i search in the monitors pane for the above monitor, i see it's seperately targeted at each OS, for exmaple at "windows server 2003 OS". why is that? i mean why isn't it's just targeted at windows computer class?
3) if the servers i want to monitor are of different OS types, i need to go over each of the monitors i see and enable it for its own OS class?
4) i see the defaults are 120 sec interval, 80% threshold. let's say i want to override it for my group of servers with 85% - do i need to override the monitor under each class?
thanks a lot in advance,
Uri

1) yes its normal and its by design
2) most of the monitors in OS MPs are like that. example- logical disk free space. this is also by design. these monitors come with different OS MPs that we import in our SCOM. It eventually helps us to set overrides and threshold values for diff OS.
3) Yes. go over each and enable the monitor.
4) I think u can create the override under the targeted class of the monitor and it will be overwritten for all.
Hope this helps.
Thanks, S K Agrawal

Linux command/shell script to find Memory consumed by JVM in EBS,SOA

Hi All,
Could anyone please let me know the following:
a)Linux command/shell script to find Memory consumed by JVM for every 1 minute frequency interval in EBS R12, SOA suite
b)Percentage of the Heap memory usage by the JVM for every 1 minute frequency interval in EBS R12, SOA suite
Thanks for your time!
Regards,

user10088255 wrote:
Hi All,
Could anyone please let me know the following:
a)Linux command/shell script to find Memory consumed by JVM for every 1 minute frequency interval in EBS R12, SOA suite
b)Percentage of the Heap memory usage by the JVM for every 1 minute frequency interval in EBS R12, SOA suite
Thanks for your time!
Regards,Please see these docs.
JVM: Guidelines to setup the Java Virtual Machine in Apps Ebusiness Suite 11i and R12 [ID 362851.1]
Generate JVM heap dump in E-Business suite 11i and R12 [ID 462550.1]
11i: How To Use Jconsole to Monitor JVM with Oracle E-Business Suite 11i [ID 415455.1]
Configuring various JVM tuning parameters for Oracle E-Business suite 11i and R12 [ID 567551.1]
Script to find Apache, Java, Jinitiator, Forms version and JVM details for Oracle E-Business Suite 11i [ID 466890.1]
JVM Memory Monitoring, Tuning, Garbage Collection, Out of Memory, and Heap Dump Analysis For SOA Suite Integration 11g [ID 1358719.1]
How to Perform Memory and Thread Analysis on SOA [ID 1450293.1]
Thanks,
Hussein

My iPod touch will not let me download more apps, though I have sufficent memory space, and other internet based functions are running...

though I have sufficent memory space, and other internet based functions are running...

Try the following to rule out a software problem:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on the router
- Reset network settings: Settings>General>Reset>Reset Network Settings
- iOS: Troubleshooting Wi-Fi networks and connections
- iOS: Recommended settings for Wi-Fi routers and access points
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar
However, since it works with other networks that really suggests a problem with your network.

How to monitor disk space in BW

can some body help me out on the following issues.
1)How to monitor disk space in BW?
2)How can I delete Application logs in BW?

When I research with DB02 transaction code in BW, I encountered following tables having lot of log , please some body can help me, how to delete the following log data?
ARFCSDATA     ARFC Call Data (Callers)
BALDAT          Application Log: Log data
BSRWBSTORE     Storage for binary large objects (Excel)

Low memory space

Hi experts ,
while working on a program i am facing runtime error of low memory space .
can u help me on this.
thanks & regards

Hi,
The internal table what you are using holding huge amount data.
Then you will get "Low Memory Space" error.
Thanks,
Sriram Ponna.

Why is my iPod Touch 5 removing songs I have synched? Plenty memory space

Why is my iPod Touch 5 removing songs I have synched? Plenty memory space. It seems to be deleting tracks which I can then download from iCloud (if there is wifi) but I dont want that

Seems like you have the incorrect sync settings
iTunes: Syncing media content to iOS devices and iPod
Many users think it is easer to sync if Show All is turned off in Settings>iTunes and App Store

I deleted all my photos and videos and then delete the deleted files but the photo app is still taking up 12 GB of space and I have no room for new stuff. How can I clear the memory space used by my deleted videos and photos?

I deleted all my photos and videos and then delete the deleted files but the photo app is still taking up 12 GB of space and I have no room for new stuff. How can I clear the memory space used by my deleted videos and photos? I don't know why the photos are still taking up space and if I will have to reset my phone to get rid of the problem.

Hey there TowneJ,
Welcome to Apple Support Communities.
The article linked below provides troubleshooting tips that’ll likely resolve the issue that you’ve described, where deleted files appear to be taking up space on your iPhone 5.
If you get a "Not enough free space" alert on your iPhone, iPad, or iPod touch - Apple Support
So long,
-Jason

HT1660 Store my iTunes in iCloud and not my computer so save to memory space?

How can I store my iTunes in iCloud and not my computer to save on memory space? I want my iPhone and iPad to Sync with iCloud and not my PC..... What is the sequence I need to follow?

Hello Bondisun,
It sounds like you would like to free up disk space on your computer by listening to your purchases directly from the Cloud, rather than storing them on your computer. First check the preferences setting to Show iTunes in the Cloud Purchases in your iTunes preferences:
Show iTunes in the Cloud purchases
Display items purchased from the iTunes Store that haven’t been downloaded to your computer. These items have a Download button next to them.
From: iTunes 11 for Windows: iTunes Store preferences
http://support.apple.com/kb/PH12468
Then you can delete all the songs in your library, and empty your trash to free up the disk space.
iTunes 11 for Mac: Delete songs, playlists, or other items
http://support.apple.com/kb/PH12159
If you have music in your library that was NOT purchased from iTunes, this will not work for them. In order to store those songs in the Cloud and listen to them via streaming as outlined above, you would need the iTunes Match service.
Here is some more information on that:
http://www.apple.com/itunes/itunes-match/
As far as your iOS devices, simply sign into your accout in Settings > iTunes and App Stores and that will sync your devices to your iTunes account.
Thank you for using Apple Support Communities.
Regards,
Sterling

How do you change the drive that my Iphone backs-up to on my computer? My first attempt to back-up and i received a pop-up stating that I do not have sufficient memory/space, knowing that I have over 120GB of free space...any ideas? thanks

How do you change the drive that my Iphone backs-up to on my computer? My first attempt to back-up and i received a pop-up stating that I do not have sufficient memory/space, knowing that I have over 120GB of free space...any ideas? thanks

dave0915,
iTunes stores your iPhone backups in the Library folder in your Home folder.
iTunes places the backup files in these places:
Mac: ~/Library/Application Support/MobileSync/Backup/
Create and delete iPhone, iPad, and iPod touch backups in iTunes
http://support.apple.com/en-us/HT4946
Regards,
Allen

Monitoring memory space in JVM

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