Android :: Why Application Has Less Heap Memory Than Others?
Nov 18, 2010
My question may look naive but I do not know how to formulate it more correctly. The problem is that I create and use large simple type arrays in my application.
And I get errors like: ERROR/dalvikvm-heap(1763): Out of memory on a 7907344-byte allocation.
Yes, it's big enough but task management tools claim that my application is using only 30MB of memory, while other at the same time use 50MB and even 110MB (have seen once) and there is still 190MB of free memory in the system (not system applications, just other ordinary applications I have installed). If all applications are provided with the same heap size at startup how can they grow so big?
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Jun 30, 2009
07-01 11:32:02.192: VERBOSE/QualcommCameraHardware(35): state transition QCS_WAITING_JPEG --> QCS_IDLE 07-01 11:32:02.232: ERROR/dalvikvm-heap(395): 6291456-byte external allocation too large for this process. 07-01 11:32:02.232: ERROR/(395): VM won't let us allocate 6291456 bytes 07-01 11:32:02.242: DEBUG/AndroidRuntime(395): Shutting down VM 07-01 11:32:02.242: WARN/dalvikvm(395): threadid=3: thread exiting with uncaught exception (group=0x4000fe70) 07-01 11:32:02.242: ERROR/AndroidRuntime(395): Uncaught handler: thread main exiting due to uncaught exception 07-01 11:32:02.302: ERROR/AndroidRuntime(395): java.lang.OutOfMemoryError: bitmap size exceeds VM budget My app shut down when i load a jpg file,i can avoid it by call system.gc().But I think memory limit will be 14M or 16M.
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Jan 15, 2010
I am working on an application for android and we since we have lots of graphics, we use a lot of memory.
I monitor the memory heap size and its about 3-4 Mb , and peeks of 5Mb when I do something that requires more memory (and then goes back to 3). This is not a big deal, but some other stuff is handled outside the heap memory, like loading of drawables.
For example if I run the ddms tool outside eclipse, and go to sysinfo, I see that my app is taking 20Mb on the Droid and 12 on the G1, but heap size are the same in both, because data is the same but images are different.
So the questions are: How do I know what is taking the memory outside the heap memory? What other stuff takes memory outside the heap memory? Complex layouts (big tree) ? Animations?
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Aug 10, 2009
I know that's a subject which was discuss a lot of time and I try to find a solution since more than 6 day for the memory leak which appears in my application.
I've read this page: http://www.curious-creature.org/2008/12/18/avoid-memory-leaks-on-andr...
So, I don't use static member fields, I always use recycle() and I don't use inner class.
My application use a gallery and some bitmap. I use finalize to monitor garbage collection in each class of my application: protected void finalize() throws Throwable {try {Log.d("FINALIZE", this.toString());} finally {super.finalize();}
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Feb 26, 2009
Ok I am at the end of my rope. I am doing some image processing. I have a large image file which I open and create a smaller bitmap from. At the end of processing I call recycle on everything. I null everything. I run GC manually.
I then try edit another image and I get an out of VM memory error. Bitmap exceeds etc etc.
I am looking at the heap and the secone edit doesn't seem to cause it to increase at all.
What else can I do. Surely google cannot possibly be suggesting that we can open one large bitmap per session and thats it?
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Aug 10, 2010
I have a list view that display about 25 images with size 60x60 pixels. I dowload this images from internet and I store in an arraylist as Bitmap. I need to save it in a arraylist because a listview will recycle views and so I need, wenn the user scroll, to display the image in the new view WITHOUT downloading again from internet
But after some time I got
java.lang.OutOfMemoryError: bitmap size exceeds VM budget
It seams that I got this exception about after loading 20 images ...
Reading in forum I have read about memory heap.
I try to check the memory heap usage with: Debug.getNativeHeapAllocatedSize and Debug.getNativeHeapSize()
When the exception occours both are about 4M.
But android has more than 4M?
When the application start the values are a little less to 4M so it seams is not a big memory usage or memory leak.
To be sure I want to call : ActivityManager.getMemoryClass() but this method is and instance method and I can't find the object to invoke!
But this method say, that al min should an application have 16M!
Any help? I have seen many topics in google ... but all speak about recycle. But if I recycle a bitmat ... then should I download again from internet?
Should I store the image on flash memory or sd card instead an arraylist in memory?
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Jul 7, 2010
In my android app, is there any way to get the total amount of memory my application is taking up, in the code. I'm using lots of large bitmaps, so it must include external allocations as well. I must, however, be able to get the number in the code, so that I can dynamically adjust to fit the budget I have.
I also need a way to get the total amount I have available (16Mb or 24Mb) as well.
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Sep 2, 2010
I've been trying to diagnose a memory leak in an Android application I'm writing. I got a heap dump loaded into Eclipse, but the results I'm seeing are very curious. There are some 20,000 instances of an exception (specifically, LDAPException from the UnboundID LDAP library) in the heap with no inbound references.
That is, they show up at the root of the dominator tree. The OQL SELECT objects e FROM com.unboundid.ldap.sdk.LDAPException e WHERE (inbounds(e).length = 0) returns over 20,000 results, totalling to nearly all of the heap. And yet, the GC runs before the heap dump and I can see that it's running in the console, repeatedly, during the execution of the leaky code. If these instances have no inbound refs, what could be keeping them alive?
I also tried doing a "shortest paths to GC" query. It shows one LDAPConnectionReader row retaining 2 instances, and ~20k LDAPException @ <addr> unknown rows with various hex addresses.
Update: I haven't had time to further diagnose this since posting it, and the bounty I posted is ending before I likely will. I'm awarding it as best I can now, lest the points go to waste. Thanks to everyone who looked into this! I will come back later and update again with the results of further diagnosis, when life is a little less hectic.
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Oct 27, 2009
I noticed when you create an AVD now that you can set an application max heap size. I found that when I did WVGA800 it was set to 24. So it looks like it's more than the 16 we are used to.
I there an API method to get the value of this max heap size? I haven't looked into that yet.
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Aug 31, 2009
Does the 1.5 SDK still have the 16mB application heap limit? Is there any way to change it? Do you think this limit will persist into the forseeable future?
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Mar 3, 2010
I could set minimum heap size in the source code like below.
--> VMRuntime.getRuntime().setMinimumHeapSize(INITIAL_HEAP_SIZE);
But I want to set this value in android.mk or androidmanifest.xml.
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Apr 13, 2010
How do you programmatically detect the application heap size available to an Android app?
I heard there's a function that does this in later versions of the SDK. In any case, I'm looking for solution that works for 1.5 and upwards.
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Feb 22, 2010
My application uses a single activity to switch between different views. I premise I'm loading a good amount of bitmaps in one of this view (say the gamescreen view) constructor but I recycle everything on the onDetachedFromWindow method.All the Bitmaps are static and most of them loaded with BitmapFactory. decodeResource method.Furthermore I'm using a gallery wich content is a simple layout with eight imagebuttons.I know all the complications using this widget and all the risks of using static bitmaps, but, I guess my problem does not entail them because my application is running well if I try to switch between these two view (and I've tried to do it about 30 times without crashes!!!) but when I pause and resume the application two times (pause->resume->pause->resume) I run out of memory, and often without the crash message (it just stays on the actual view).
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Jan 25, 2010
I am getting a "bitmap size exceeds VM budget" error. I have read that there is a 16MB memory limit. In this thread Romain Guy says that "you can only allocate 16 MB of memory for your entire application".
However, my app must be running out of memory long before it reaches that limit. So my question is: how do I allocate memory to my application ... how can I get the allocation to my app increased (within the 16MB maximum)?
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Jul 7, 2009
How do we profile an android application's memory ?
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Oct 4, 2010
Can you please tell me how can I do memory profile for an android application? I want to find out how are the objects created and where did those created.
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Nov 5, 2009
what do the following mean in the Heap view of *DDMS*:
1) Data Object
2) Class Object
3) 1,2,4,8-byte *array* : which arrays are we talking about here??
4) non- Java object
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Nov 2, 2009
I'm an Android game developer and I need to ask you a couple of questions about Android heap limit.
Does the 16 MB heap limitation also applies to OpenGL ES textures or SoundPool sound effects? Since they are managed by native code, is it correct to affirm that there is no problem in using more than 16 MB of RAM in app/game resources/assets? If it is possible right now, it is guarantee to be possible in the future?
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Jul 17, 2010
So from my understanding each application normally gets 16 mb memory to work with. This is what is shown on the heap tool for eclipse:
Heap Size: 4.5 mb
Allocated: 3.2 mb
Free : 1.5 mb
Used : 66.7%
Which one is the total memory being used? Heap size, or Allocated?
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Oct 8, 2010
I was trying to download application from OTA server on my device but fails as SDCard is not present in it.Is it possible to download application in device memory?
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Nov 24, 2009
I am experiencing a memory / resource leak on a T-Mobile G1 device with my application. I installed the "Task Manager" application from Android market and my memory usage is not monotonically increasing. It stays relatively flat over time. Furthermore, none of the other processes are chewing up tons of memory either (really, I can get into this state with just my app running). I am not experiencing this problem on any of the other Android phones (including Eris, Hero, and Droid).
The interesting thing is that if I kill my application, the phone is *still* very slow and sluggish. The only thing that seems to be able to get me out of this situation is a battery pull. If I run my application for about 3 hours, the phone starts to become very sluggish. Even simple operations like hitting the "home" button take many seconds. I'm not sure what to do at this point and am wondering where I can go from here.
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Sep 4, 2009
I have an application in Java-side, and it uses some "SO" files in native-side. How to calculates the memory usage of my application, in Java-side and native-side both? Does Android provides toolkit to calculates the memory usage of application?
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Jun 8, 2010
I am trying to get the memory usage for every application at different periods of time. I have checked the docs / threads / forums, and i only found that you can get the total available memory value, but i could not find in the sdk an api call for getting the memory used by a single application. I know that one way to do this is by reading the values from /proc/ <pid> virtual file system but this is painful for the device cpu. Can you help me figure out how to solve this problem ? Or does anyone know how settings -> applications -> manager applications read the memory usage values.
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Feb 19, 2010
how I can find the memory used on my Android application, programmatically. I hope there is a way to do it. Plus I would like to understand how to get the free memory of the phone too.
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Aug 28, 2010
What is the maximum memory limits per application for Android 2.2?
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Aug 5, 2010
Is android's memory 16MB limit per Process or Application? If the limit is by process, I can make some services remote. That means the service will be in different processes, and the limit will be 16 x N.
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Mar 1, 2010
I have a problem with my application, and it's about a Virtual memory error: ERROR/AndroidRuntime(19790): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
The story is like this: I have an activity (let's call it A), the user click on a button from this activity, then i will make an api call somewhere in the internet, and after the result is back i start a subactivity (let's call it B).
In the activity B i have to dinamicaly load some images from the resources folder. I load the images into bitmaps -> drawables -> imageviews. After the user click's on some buttons i have to setResult(..), finish(), and get back to activity A.
The thing is that, goes from activity A to B, then B -> A, then A -> B for a few times, my app crashes with the message above: it doesn't have enough memory to load the interface.
I can not maintain the activity B on the stack because i don't want the user to go to this activity without going through activity A first.
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Apr 13, 2010
I have a requiirement of finding out the max RAM usage of my application. I tried installing the Memory Profilers in eclipse but I was not able to use it with my application. Please let me know how can I find the RAM usage of my application on the 'emulator'.
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Sep 24, 2010
Are you meticulous in removing all per-frame heap allocations from your game? (At least the allocations that you can control and that have practical alternatives.)
While trying to reduce per-frame heap allocations from my running game, I found that method
android.opengl.Matrix rotateM(float[] m, int mOffset, float a, float x, float y, float z)
Does a heap allocation. This means maybe 10 or so extra heap allocations per frame and is the only per-frame allocation left in my application (well, the only one that I can directly control). I am thinking of replacing this with my own version - one that does not do any heap allocations.
I also had some lists that I replaced with my own list implementation because I found that some standard list iterations would create new iteration objects, putting more pressure on the heap and forcing more frequent garbage collection.
I know that I can't eliminate all the heap allocations. In particular, input seems to trigger a bunch of allocations.
I can't help but think that anything reasonable I can do to reduce pressure on the heap will improve the user's experience (if garbage collection is going to stall my game). Obviously there are diminishing returns at some point, so ultimately I have to make a judgement call.
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Oct 15, 2009
I have an app which does a bunch of image manipulations, and those images are ideally full-screen sized. It works on a G1 (or HVGA emulator), but runs out of memory on a WVGA emulator instance, because full-screen images use twice as many pixels. Fine, I can work around it by manipulating smaller images, then scaling up to WVGA at the end. There's some loss of image quality, but this is unavoidable on a WVGA device with a 16MB heap limit, so I'll live with that.
When a real WVGA device hits the streets in the next couple of months, though, it's likely to have more than 16MB heap per app, for just this kind of reason. So for best image quality, I'd like my app to adapt to this situation, and use full-screen-sized images on such a device. IOW, I'd like to implement a heuristic which sets the image size based on heap size.
In order to do so, however, the app needs to know what the maximum heap size is, and I haven't yet found an SDK call which will return this information. The various Debug.get* memory calls all seem to be to do with how much heap you have *allocated*, not how much you theoretically *can* allocate. I understand that this isn't necessarily a hard number, that issues like fragmentation and GC mean that you may not actually be able to allocate every last byte, but a theoretical number would still be useful.
Can anyone point me to an SDK call I've missed?
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