allocate 10 GB of memory dynamically

Sure, use a 64 bit CPU and OS.

Hi, How to do that Heap allocation for a Board baed on 32-Bit CPU and OS ? ( CPU cannot be changed at this stage :( .... !! )

Any tricks ?

Thx in advans, Karthik Balaguru

There are no easy tricks. With a 32 bit address register, you can only access a theoretical maximum of 4GB. In practice you'll have to subtract kernel memory space.

Which CPU/OS are you using ? With IA-32, you may be able to use the PAE (Physical Address Extension). If you use Windows, look for the Address Windowing Extensions. On Linux, you can use mmap(). Through these tricks you can access more than 4GB, but only in sections, not all at the same time.

You can allocate as much memory as you like, but not in one piece. If you want to make it look as one piece, you can implement a C++ class which will handle the pointers.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

Unable to get your point. I understand that there is some method to allocate memory of any big size. But, not in one piece. How is this possible ? Could you pls explain the technique .

Thx in advans, Karthik Balaguru

I am using MCF5272 Coldfire processor and UCOS-II RTOS(Micrium's).

Regards, Karthik Balaguru

Got the point now. My understanding is I need to have something similar to malloc and allocate until 1 GB (loops) and have it connected by somemeans and use it . I will try implementing the similar logic .

Thx, Karthik Balaguru

I may need to do have something similar to mmap() in UCOS-II. So, mostly something similar thing (mmap) in UCOS-II RTOS has to be written ?? what do you think ? Any ideas / docs for starting with this mmap creation ?

Thx in advans, Karthik Balaguru