Why the memory Limitation to a data structure in cpp: size of "XXX::C_Su​bNetwork::​S_ListBuff​er [3]" >= 256 Mb and can I raise the limit higher?

How can I use more than 256Mb of memory for a data structure in cpp (visual studio)? Can I set the memory Limit to 1 GB of memory ?

The ERROR:

File C:\xxxxx\Source\TRUNK\aaaaa\Subnet.h line 550

Error: Limitation: size of "XXX::C_SubNetwork::S_ListBuffer [3]" >= 256 Mb

S_ListBuffer ms_DataBuffer[mu8BufferSize];

S_ListBuffer is a structure that is member variable.

Answer 1

[James Tursa]

This looks like you are declaring this variable as a local variable, in which case the memory for it will come off of the stack. The stack has a much smaller memory limit than the heap. You should allocate this variable from the heap with the new[] operator. (I.e., declare it as a pointer and assign it the result of a new[] operator). Be sure to delete[] it when you are done with it.

S_ListBuffer *ms_DataBuffer = new S_ListBuffer[mu8BufferSize];
    :
delete[] ms_DataBuffer;

[jeremy longstreet]

It has to be on the stack. If we allocate more memory in the "LINKER", will Polyspace follow? Or can we adjust Polyspace to allow more memory on the stack?

[James Tursa]

I don't use Polyspace, so I have no idea how to increase the stack size and have "Polyspace follow." But, really, variables this size should be coming from the heap IMO.

[Walter Roberson]

On some processors, stack-relative offsets are limited in the number of bits, because the offset is built in as part of the instruction.