Allocation of Static Memory - Memory Management

Hi,
Really need to know, how do you allocate Static Memory in Java?
Please give your views.
Thank You..

I didn't know people were being paid for answering
here. As far as I know a forum is for knowledge
sharing..I was merely making the observation that if I helped you get the job then I should be entitled to a cut of your pay? Do you disagree?
This question has ben asked in a scenario of
comparison between an Array and a Vector.
So for eg. if I say int[] i = new int[100];
that means that it is a static memory allocation cuz
I',m creating a limited object there.
A vector can be dynamically updated.Your question would have made a little more sense if you had included these details at first. Anyway, like DrLaszloJamf said the source is available so you can compare the details of these classes directly.

Similar Messages

  • Memory Card Manager Buttinski

    Every time I add a song to, or delete a song from my Shuffle, I get a message from the "Memory Card Manager" that says "Failed to locate supported file types or there are no photos found on this device." Everything works, mind you, but that noise and announcement each time is mighty annoying. Any suggestions?

    Mark, I am having the same issue, as my (just bought a few days ago) 4GB Nano is being recognized by my Dell Memory card manager as a memory card, and indicating "Failed to locate supported file types as there no photos found on the device." Same thing occurs whenever I disconnect and reconnect to the USB cable. I have already had my iPod Nano restored at the Apple Store, and have downloaded the newest 6.0.5 iTunes and 1.1.2 iPod software, so I should be good to go. I should also tell you that I have tested all the USB ports, and they are fine. iPod also runs ok on my other Dell Desktop computer, which isn't running with the same Dell Memory Card Manager software (Dell 964 Printer). Are there a portion of the Dell software related to the memory card functions only, or do I have to uninstall the entire software? How will that effect functionality of my 4 in 1 Dell printer? Thanks!
    Dell Desktop 8300   Windows XP Pro  
    Dell Desktop 8300   Windows XP Pro  
    Dell Desktop 8300   Windows XP Pro  
    Dell Desktop 8300   Windows XP Pro  

  • Static Var Memory???

    Hi,
    I have a doubt in the static variable memory storage. Suppose if
    i have declared a static var like:-
    static int i=10;
    Here the variable will occupy 32 bytes that is for int datatype or it will occupy only 2 for the value 10 ? Since it is static??
    Thanks,
    JavaCrazyLover

    Static has nothing to do with the size of variable.... it simply means that when in a class a variable/ method is declared as static all the objects of that class will not have individual copies of that variable/method and wlll instead refer to the same variable/method.....
    An integer always occcupies 4 bytes, ie. 32 bits. so if you store 10 in an integer the first 4 bits would be 1010 and the rest of the 28 bits would be filled with 0's regardless of whether it is static or not
    rgds,
    Juhi
    ps. one must always keep in mind that numbers are not stored in base 10...they are always stored in the form of their binary equivalent, i.e in base 2

  • I want to cancel buyingg operation of ICloud 10 GB Memory Cards realised November 22th . So I want back  used of free 5 GB memory Memory Cards . What will I do? Thanks. Sincerly...

    I want to cancel buyingg operation of ICloud 10 GB Memory Cards realised November 22th . So I want back  used of free 5 GB memory Memory Cards . What will I do?  Thanks. Sincerly...

    Give Apple a call, as shown in this post: https://discussions.apple.com/message/16968425#16968425.

  • Undo Block Allocation Algorithm in Automatic Undo Management

    Hi,
    Can someone please explain me the Undo Block allocation algorithm in Automatic Undo Management??
    I need to tune my Undo tablespace in my Prod database.
    regards,
    Arul Sekar

    Hi,
    Thanks for the link provided.....
    But the link which has been provided does not contain the details about the Undo block allocation alogorithm in AUM.
    Can you please help me in this regard??
    regards,
    Arul Sekar

  • ByteBuffer's static "wrap" method -- managing memory

    Hello,
    I have a function which will be called many, many times over:
         public static ByteBuffer byteArr2ByteBuff(byte[] data, int off, int len) {
              byte[] subData = new byte[len];
              try {
                   System.arraycopy(data, off, subData, 0, len);
              } catch (Exception e) {
                   e.printStackTrace();
              // TODO find out if null'ing out subData works? Curious if this helps efficiency? This function will get called a LOT...
              ByteBuffer out = ByteBuffer.wrap(subData);
              subData = null;
              return out;
    My question this:
    At the end of my code, I null out the "subData" array manually since I am not sure if the "wrap()" method will cause the subData to be held on, or get garbage collected.
    Now, its not easy for me to test this out in my current system since I am actually using this on the Android platform (min API 8). Preferably, I would just "return ByteBuffer.wrap(subData);" and be done with it, but since this function will get calls 100's of thousands of times, I want to be doubly sure its efficent.

    Thanks for the reply, let me give you some background information as to why the function will be called many times. I am creating an app on Android that works with Bluetooth and will accept streaming data. The data that is coming in is binary, so I need to cut the data into its chunks and feed it into a float, or short, or int, etc.
    For example, after it comes out the "return ByteBuffer.wrap(..)" I take that output and do a .order(null).getFloat() on it, depending on the byte order.
    As much as I wish I could have used JavaStruct (see GoogleCode) or the C/C++ style Structs to feed in data a-la #pragma(push), I don't see any other way to handle this kind of data. I am hoping that ByteBuffer is very memory efficient and fast.
    Also, as for the "System.arraycopy()" usage, I could look into making that more efficient, however that would require all other methods calling byteArr2ByteBuff to modify how it sends data to this function.
    Thanks for clearing the air on how Null doesn't have any effect though. If you have other ideas on how to handle the parsing of binary packets coming in through a socket, I am definitely all ears!
    PS. I'd rather using Arrays.copyrange instead of the System.arraycopy method, but since I am making this app work for Android API8+, I am limited on the Arrays methods.
    Edited by: 1000047 on Apr 17, 2013 11:42 PM
    For example, here is an example of the usage (sorry not sure how to properly format in sans-serif on this forum yet!)
              public void unpack(byte[] data) {
                   int i = -fSize; //fSize == 4
                   accx = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   accy = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   accz = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   gyrox = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   gyroy = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   gyroz = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
                   temp = Streams.byteArr2ByteBuff(data, i += fSize, fSize).order(null).getFloat();
    Edited by: 1000047 on Apr 17, 2013 11:45 PM

  • Memory (mis)management in Safari 2.03, your experiences

    Seems to me that memory management has improved in this version.
    I've haven't really closely monitored the memory footprint but right now, mine is at 104 megs. This is after I put it through some stress in the form of at most 5 windows and 3 tabs in one window at once. Plugins and java are disabled, javascript is left on.
    In fact as I'm typing right now the memory has cycled back to 101 megs. Though I have a mere 2 windows open right now.
    Closing tabs and windows seems to reclaim some memory but not always.
    What are your experiences?

    No performance seems fine.
    I used to have performance issues in earlier versions. Yeah OS X can page out some of Safari's allocation to VM to make room for other applications but as soon as I went back to using Safari, all that "leaked" memory would be paged back in leading to some HD bottlenecking. I think the current version seems to performing much better.
    I don't have any specific problem. I was just curious as to other people's experiences.

  • Memory/resource management in Mac version of D11.5

    I have a Director project which loads significant text data for analysis. In the process of loading it creates new cast members filling them with data.
    With D11 and D11.5 after doing the import there appears to be not enough memory to keep all the important cast members and globals in memory.
    Originally this led to black screens where members did not load -- now I preload the movie so the black screens are gone.
    But key globals are not maintained so I now get script errors when trying to look at certain data.
    I have tried unloading the members that where created during the data load and setting the purge priority to 2 - next. I also tried creating empty cast members in advance to just dump the data into.
    I have increased the extra memory bit in the build screen to 3000000.
    None of this seems to help.
    The project is set up to save the data within itself on closing. So if I close the project and then reopen it --  all is fine and all data is available. ie Director has loaded only the cast members and globals needed and allocated memory needed.
    So why can't I get it to behave on the initial data import?
    The project has worked for years using Director MX 2004 but with Mac Lion and the demise of Rosetta that is no longer an option.
    BTW This is a Mac only problem and I have just enough Mac clients that I'm in trouble.
    Thanks

    Hi Pramod;
    We found this Notes:
    Note 1589308 - BRFplus - Dump in Web service generation
    Note 1693686 - CNS: Runtime error SYSTEM_ON_COMMIT_INTERRUPTED
    It´s not cleared because some Notes are talking about CRM, and I think it's a particular error from SAP PPM and BP's (Business Partner).
    Best regards,
    Mariano

  • Memory leak - Managed beans kept in memory in ADF

    Hi,
    Our application occasionally runs out of memory, and what we are finding is that the managed beans beneath components on the page are not being cleaned up, even after the user's session has expired.
    What I am finding, by using the JDeveloper debugger and Heap window, is that there are instances of com.evermind.server.http.EvermindHttpServletRequest left in memory, which hangs on to the entire page, and therefore all of the instances of the ADF Component classes and managaged beans.
    Has anyone else come across this and found a way to clean up all of the page information left on the EvermindHttpServletRequest after the page is no longer in scope, and the session has expired?
    Any assistance which anyone can provide on this issue would be greatly appreciated.

    Hi,
    I'm quite sure I'm hitting the same problem here. This is really serious!

  • Declaring static variable to save memory, memory cost of link

    If I have plenty of objects of the same class and they have a field that is the same for all objects, do I save memory by declaring it 'static'?
    How much memory is used by an object to store a link that points to another object?
    /Carlis

    Ok!
    I am making a map for a computer game, and it has plenty of Towns. Now, every object of type 'Town' has a list with different Tribes
    String[] Tribes= {"Roman", "Teuton", "Gaul"};
    This list is identical for all objects of type 'Town'.
    Now, if I declare it to be static like this;
    static String[] Tribes={...};
    Does this save memory? If I understand this correctly, the 'static' keyword means that the 'String[] Tribes' is only stored once rather than in every object of type 'Town'.

  • Static method - memory usage

    will an application containing many static methods use more memory than an application w/ less static methods? are there any performance or memory issues w/ using static methods?

    I totally disagree that one should let oop principles NOT performance dominate design. While you may have a point in 99.99% of applications, I am in the 0.01% where performance has forced me to implement some hard choices.
    If static is faster and you call that method millions of time you may have some real issues to face. Let's say you lose a microsecond on each call by going non-static. That means for 1x10^6 calls you've lost a second. Which may not seem like a lot, but in multi-threaded user apps such as servers, this is very significant.
    I'd argue that there shouldn't even be a method. In fact just expose the instance variables and access the data directly, or don't even have the class and just in-line. Or even better, jni. How about just write it in Assembler. Where to draw the line???
    Before rants occur, this is only important to do in critical sections of code. Not recommended where you can use well structured oop principles which are preferred.

  • How to release memory in managed C++?

    Hi guys,
    We meet a memory leak issue when to invoke managed C++.
    In our project, we use a managed C++ method to invoke a native C++ method (through C++ interop), and by using of
    a unit test case to find the different memory usage between managed and natived.
    We believe the managed C++ consume some more memory and it will need to create a managed/proxy object for each unmanaged object. I have tried
    to call GC.Collect() manually, but it doesn't work memory out.
    Following is our target managed method, do you have any ideas to release memory?
      IProxyList<INamedElement^>^ NamedElementProxy::GetAllMembers() {  return gcnew SetOfNamedElementProxy<INamedElement^>(metaNamedElement->GetAllMembers()); }
     Thanks in advanced

    Thanks Viorel for your quick response!
    I tried to use "delete[]", but it doesn't work either.
    void NamedElementProxy::ReleaseProxy(IProxyList<INamedElement^>^ myProxy)
    delete[] myProxy;
    I also did another try to verify if the pointer address is different between native c++ object and managed c++ object, I find the answer is negative,
    the two objects have the same pointer address, take the following code for example, allMembers0 and allMembers1 point to the same address.
    IProxyList<INamedElement^>^ NamedElementProxy::GetAllMembers(ManagedProxy::Enums::ElementKind kinds, AttributeMask^ required)
    ReferenceTo<Meta::SetOfNamedElement> allMembers0 = metaNamedElement->GetAllMembers((Meta::ElementKind)kinds, *required->ToNoGC());
    IProxyList<INamedElement^>^ allMembers1 = gcnew SetOfNamedElementProxy<INamedElement^>(allMembers0);
    return allMembers1;
    I am confused why the release from managed c++ doesn't help to release native c++?

  • Java memory usage/management

    Hi,
    I am trying to give my program as much memory as possible. I have a machine with over 6GB of RAM. However, when I try
    java -Xmx4096Mwhich is significantly less than what's available, I get this error:
    Invalid maximum heap size: -Xmx4096M
    Could not create the Java virtual machine.How come?
    Secondly, lets say I try a smaller number, like 3.8 GB:
    java -Xmx3800Mthings work perfectly.
    Now, if I try 3.9 GB:
    java -Xmx3900MI get this error:
    Exception in thread "main" java.lang.OutOfMemoryError
            at java.util.zip.ZipFile.open(Native Method)
            at java.util.zip.ZipFile.<init>(ZipFile.java:112)
            at java.util.jar.JarFile.<init>(JarFile.java:127)
            at java.util.jar.JarFile.<init>(JarFile.java:65)
            at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:575)
            at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:542)
            at sun.misc.URLClassPath$3.run(URLClassPath.java:320)
            at java.security.AccessController.doPrivileged(Native Method)
            at sun.misc.URLClassPath.getLoader(URLClassPath.java:309)
            at sun.misc.URLClassPath.getLoader(URLClassPath.java:286)
            at sun.misc.URLClassPath.getResource(URLClassPath.java:156)
            at java.net.URLClassLoader$1.run(URLClassLoader.java:191)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
            at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
            at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)How come?
    I don't mind the fact that Java can't give me 4096M. I can live with that. But what I would like to know is why I get this last error and also what is the MAXIMUM that I can use for the -Xmx option? I have some serious testing to do and I can't just write that "-Xmx3900M didn't seem to work and so I went with -Xmx3800." People will not like that sentence.
    Thanks,
    Jeff

    OutOfMemoryError. My goal right now is to make sure
    that I let Java have as much memory as the JVM can
    handle. It seems like giving it 3800M is ok, but IBeing able to set the heap size to 3800M doesnot mean that your JVM is actually using it uptil 3800M.
    would like to know if there is a good reason that
    3900M doesn't work.On 32-bit processor machines, the largest contiguous memory address space the operating system can allocate to a process is 1.8GB. Because of this, the maximum heap size can only be set up to 1.8GB. On 64-bit processor machines, the 1.8 GB limit does not apply, as 64-bit processor machines have a larger memory address space. So now you need to see what processor do you have and if its a 32 bit processor no matter you set it to 3800 or 7800M the max size limit is 1.8G
    >
    Thanks guys for the help so far.

  • Windows vs Linux memory/process management

    hi,
    my problem is that my windows process that deals with the Oracle Workflow engine grows so big that the Operative System crashes. Is there a way of getting windows processes to use more RAM memory, or is there a way to avoid it? Maybe with a linux system i could overcome windows memory limits ...
    regards,
    Ricardo

    There are several questions you need to answer before a good response can be provided. At the least
    1) Do the SAs maintaining the systems have good OS tuning knowledge;
    2) Do the DBAs maintaining the databases have good database/instance-to-OS tuning knowledge;
    3) Are the graphic subsystems in Linux on or off;
    4) Which file systems are to be used on each environment;
    5) Which versions of each OS are being compared?
    Publishing benchmarks without prior permission is generally a violation of both Oracle and Micorosoft license agreements. I'm not sure one could obtain permission from Microsoft if the benchmark indicates Windows performance sucks. So any performance benchmarks, other than those published at TPC.org, need to be viewed with suspicion. (And those at tpc.org were built at a significant cost by people who are experts at tuning, at least for specific cases.)
    In my informal evaluation, in which I simply installed 10g on a certified version of Linux and of Windows on identical hardware (P2.2 GHz, 2GB RAM, 40GB/5400/2M-cache disk). I did not tune the OS or the application in any way - this is not a benchmark, just an observation relevant to my configuration. I noted the performance was about the same.
    However, dropping Linux to runlevel 3 got me about a 40% increase in performance compared to runlevel 5. But ... I did not check on a variety of different hardware configurations.
    The answer, my friend, is simple ... try it yourself.

  • Hyper-V, Dynamic Memory, Memory Demand more than Maximum memory

    Hi,
    I have found that for some VMs Demand Memory more that Maximum Memory set.
    Where can I found any documentation about this?

    A VM can 'demand' more memory than is possible'
    But it will never actually be given more then the maximum.
    In the VM the application is asking for more RAM from the virtual memory manager of the OS in the VM (not to be confused with any memory management that the hypervisor is doing).
    When the VM hits its Maximum setting it is no different than a physical machine hitting its physical RAM cap - the OS begins paging to give the application the additional RAM it is asking for.
    It simply means that you have a greedy application.  SQL and the Exchange mailbox role have a long history of being very greedy applications (SQL made many changes to work in concert with dynamic memory) - taking all of the RAM they could get.
    In your case, you have a startup of 32GB a minimum of 24GB and a Maximum of 36GB.  And the application in the VM would 'like' to have 54GB.  If you look in your VM OS you will probably find that it is paging to disk.
    What is your allocation setting?  The default of 20%  Higher?
    Personally - I see little value in using dynamic memory with such a small window of difference between the startup, minimum, and maximum.  It is as if you are trying to micro manage the feature, instead of allowing the feature to work as designed.
    Dynamic memory is designed to balance RAM between all of the VMs on a particular hypervisor at the same time.  And to allow use of all the RAM the machine has, if there is a workload that can use it.  If the VM wants 64GB, why not give it that. 
    Dynamic memory will not starve other VMs to give this VM more RAM (unless you give this VM a higher priority).  But it will take RAM away from a VM (if absolutely necessary) to allow another VM to meet its requirements.
    Any VM is always guaranteed its startup, at boot time.  And dynamic memory will not starve it below it minimum - and if the VM is not using RAM it will take RAM away down to the minimum.  And a VM will never be given more than the maximum, even
    if the VM wants more.
    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.
    Disclaimer: Attempting change is of your own free will.

Maybe you are looking for