Question

How much memory i can allocate dynamically in windows mobile

Asked by: sureshkoleti

I am new to windows mobile 6  programming.
I have some doubts in windows mobile 6 programming .

1) How much memory will be allocated for each process.
2) Is we can restrict process memory using any windows apis
3) How much maximum  memory we can allocate dynamically (ex : using new ) is there any restriction?

Is there any good website to know all this type of details.
I want to know further details also . Please help me regarding this.

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Asked On
2009-09-16 at 05:44:01ID24736073
Topic

Windows MobileProgramming

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: Mikal613Posted on 2009-09-16 at 05:48:22ID: 25344980

 

by: pgnatyukPosted on 2009-09-16 at 06:06:01ID: 25345124

Windows Mobile 6 (6.0, 6.1, 6.5) is based on Windows CE 5.x.  

So we have 32 MB per process - that's for your application, DLLs, stacks, malloc, free, new, delete, whatsoever.
It is so even your device has 128MB and 74MB from it for the running programs.
More memory you can get if you will use, for example, the file mapping.

Here is "Effective Memory, Storage, and Power Management in Windows Mobile 5.0" from MSDN
http://msdn.microsoft.com/en-us/library/aa454885.aspx

Here is a famous arctile: http://blogs.msdn.com/hegenderfer/archive/2007/08/31/slaying-the-virtual-memory-monster.aspx

More:

http://bolingconsulting.com/blog/?p=4

http://blogs.msdn.com/robtiffany/archive/2009/04/09/memmaker-for-the-net-compact-framework.aspx


 

by: sureshkoletiPosted on 2009-09-17 at 00:21:59ID: 25353496

Thanks for response

I got plenty of points related to windows mobile with above links but i did not get exact answer for my 2 and 3 questions

2)Is we can restrict process memory using any windows apis
3) How much maximum  memory we can allocate dynamically?

Thnaks

 

by: pgnatyukPosted on 2009-09-17 at 00:32:23ID: 25353535

2) I don't understand you. I can guess - if in the application you want to have less memory, in the beginning call malloc for 10 MB,..., declare a huge static array, etc. You can create a heap with the size you need and use only this heap for the memory allocation.
3) up to the OS Image installed on your device. Almost always, for real Windows Mobile 6.1 devices you may get about 1GB memory, if you will use an "advanced" technique - for example, CreateFileMapping. If you will use just trivial things as new and delete, you cannot get more then 32MB. The default stack size is 1MB.

 

by: pgnatyukPosted on 2009-09-17 at 00:43:00ID: 25353585

about 2): the device itself has a amemory settings. You can decrease the memory for the running programs there. Probably it will not work, so you can just copy a lot od data on the main memory of your device.
If you work with the managed code - the situation is a bit different - sometimes better, sometimes worse - more details you can find in the arctiles we posted for you here.

 

by: sureshkoletiPosted on 2009-09-17 at 23:20:32ID: 25363251

Thank u very much for support

I got one thing from above links are
Each process will have 32 MB process space.
In that code section,data section ,stack and heap will be there.
But From above links i didn't get that what is the size of heap.
If i want to call new[64kB] or new[32MB] is it will allocate memory?
How much maximum size i can pass is size available in heap right. I want to know that heap size.
How much size i can pass to new.

Thanks in advance

 

by: pgnatyukPosted on 2009-09-17 at 23:55:48ID: 25363358

It is difficult to explain just in few words.

Each process takes 32MB - if your application is in C++, these 32 goes for your executable and DLL's - they are loaded into this space. Stack and heap is also from this 32 MB. Stack by default is 1 MB. You allocate memory, creates threads, load dlls,... so you will have just a salad in these 32 MB - stack, heap, stack, heap.

If your application is very big - executable and huge DLLs (unmanaged code), you will have less space for the stack and heap. In Windows Mobile 6.1 this part was improved, but on Windows Mobile 5.0 there is a problem with the DLL loading, for xample - everything in the same space.

I'd say you cannot allocate more the 5-16 MB, if you use only new and delete. VirtualAlloc will help you. CreateFileMapping helps also.

Details:
http://msdn.microsoft.com/en-us/library/aa450572.aspx

http://bolingconsulting.com/blog/?p=4

http://hariexcel.spaces.live.com/blog/cns!D1237283CA43FD1D!176.entry

http://blogs.msdn.com/robtiffany/archive/2009/04/09/memmaker-for-the-net-compact-framework.aspx

 

 

by: sureshkoletiPosted on 2009-09-18 at 05:42:21ID: 31629394

This links helped me a lot.
To get knowledge on windows mobile

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