heap-memory | 易学教程

What is the difference between Java Non Heap Memory and Stack Memory? Are they Same if not what is the difference between them?

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I am using Jconsole for monitoring a Java Application. The memory tab shows different Heap and Non Heap memories like Heap Memory Usage Non Heap Memory Usage Memory Pool "CMS Old Gen" Memory Pool "Par Eden Space" Memory Pool "Par Survivor Space" Memory Pool "Code Cache" Memory Pool "CMS Perm Gen" What is the difference between these terms. Also please provide some information regarding - how to find anomalies in the application behavior by monitoring these parameters. There are essentially three categories of storage in all C-based languages (and most other languages): Heap Stack Static (with

How can I check if there is enough heap memory available?

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问题 I have an assignment that requires me to create a "Heap" class that allocates and deallocates memory. I believe that my code works and the solution builds and runs properly but I want to make sure that I am not getting any memory leaks. I also need to add some code that checks if the desired amount to be allocated to the heap is even available...if someone were to allocate a very large amount. How is it possible to check if the memory allocated on the heap is available or NULL if there is not

out of memory exception + analyzing hprof file dump

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问题 this is in connection with this question java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) i created the dump file in question.. and it gives following information One instance of "byte[]" loaded by "<system class loader>" occupies 1,10,59,216 (51.02%) bytes. The memory is accumulated in one instance of "byte[]" loaded by "<system class loader>". Keywords byte[] so now what can be done?? how do i clear the problem?? my list_objects[context]-inbound

memory allocation in Stack and Heap

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This may seem like a very basic question, but its been in my head so: When we allocate a local variable, it goes into stack. Similarly dynamic allocation cause the variable to go on heap. Now, my question is, is this variable actually lie on stack or heap or we will just a reference in the stack and Heap. For example, Suppose I declare a variable int i . Now this i is allocated on the stack. So, when I print the address of i , this will be one of the location on stack? Same question for heap as well. Chris Eberle I'm not entirely sure what you're asking, but I'll try my best to answer. The

LocalAlloc Vs GlobalAlloc Vs malloc Vs new

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I have searched for this on various links, but still the doubt persist. I do not understand the difference between LocalAlloc vs GlobalAlloc vs malloc vs new for memory allocation. I have gone through this link of MSDN: Comparing Memory Allocation Methods Please explain the following statement: The malloc function has the disadvantage of being run-time dependent. The new operator has the disadvantage of being compiler dependent and language dependent Abhineet Excerpts from Raymond Chen's OldNewThing Back in the days of 16-bit Windows, the difference was significant. In 16-bit Windows, memory

How to empty or clear heap memory dynamically in my code

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问题 In my application i am using simple gallery and the coverflow both i have my coverflow image gallery on image clicked in coverflow i am redirected to next activity that contents full screen gallery and i can even scroll my fullscreen gallery ; but when i put more amount of image or high resolution images in my app it get force closed due to Bitmap size exceeds VM budget so i want to clear heap memory every time i finish my cover flow and gallery so i can load any amount or any resolution

Out of memory cache error when accessing inside the app

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I've searched a lot but I did not understand where to is my error. First in my app I am getting images from the web if there is no net I am getting them from created database. I am going to post my ImageLoader class then the memory class then the utils class if there is something wrong please I need some help Thanks in advance. public class ClassImageLoader { ClassMemoryCache memoryCache=new ClassMemoryCache(); ClassFileCache fileCache; private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>()); ExecutorService executorService; public

Tomcat: adjust memory proportions

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I have a Tomcat instance running on a Windows 2008 Server with 4GB of RAM. The server is dedicated to this one application, so I would quite like to be able to dedicate most of the RAM to Tomcat. My Tomcat setup currently has the following java options: -Xms256m -Xmx1600m I'd like to increase the amount of RAM, preferably up to about 3GB (obviously I know how to do that, just increase the -Xmx value). However, Tomcat refuses to start up if I increase the maximum heap space beyond 1600MB. Several websites that I have read say that Tomcat cannot use more than 40% of the available RAM, which

Android Heap memory increase

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I am developing an application on Android 2.2 which takes extensive memory and my most operation cannot be complete because of low memory. Could anybody give me solution that how can I increase my application heap size. I have tried android:largeHeap="true" but it is not supported in Android API-8. I am thankful you all. Heap size depends on the hardware your running your app an. For example 16mb on a G1 and 32mb on a nexus one. Don't think there is much you can do about it. If you target versions below 3.0 that is. Could anybody give me solution that how can I increase my application heap

Java heap dump error with jmap command : Premature EOF

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I have encountered below exception during execution of below command jmap -dump:format=b,file=heap_dump.bin <process_id> output: Dumping heap to <file_name> Exception in thread "main" java.io.IOException: Premature EOF at sun.tools.attach.HotSpotVirtualMachine.readInt(HotSpotVirtualMachine.java:248) at sun.tools.attach.LinuxVirtualMachine.execute(LinuxVirtualMachine.java:199) at sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:217) at sun.tools.attach.HotSpotVirtualMachine.dumpHeap(HotSpotVirtualMachine.java:180) at sun.tools.jmap.JMap.dump(JMap.java:242) at sun