Huge amount of memory allocation with BCB

[murataykut]

Hi,
I'm writing image processing program on BCB. But, for huge amount of memory allocation BCB doesn't works properly.
I want to allocate nearly 2 GB (total) dynamic arrays. For 1,5 GB there is no problem. But when this size incresing it gives bad allocation error.
In that computer there is 2 GB physical memory and I use WinXP (and I add /3GB to boot.ini).
For testing I wrote an Visual C++ code in another PC which has 1 GB phyisical RAM. In the below code Visual C++ can allocate 1600 MB memory. But this code can allocate only 794 MB on BCB. What can I do? Please help...

DWORD dwSize = 1024*1024*1600;
LPVOID pvBase = VirtualAlloc(NULL, dwSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (NULL != pvBase)
{
//For test only...
LPBYTE MyPointer = (LPBYTE)pvBase;
MyPointer[0]=15;
MyPointer[1]=20;
}
else
{
// GetLastError
}
VirtualFree(pvBase, 0, MEM_DECOMMIT);
VirtualFree(pvBase, 0, MEM_RELEASE);

pvBase = NULL;

 

[marc2010]

Hi,

I'm having a similar issue. Did you manage to solve this problem?

thanks

 

[2ffat]

There are alot of things that affect how memory is allocated. I would be interest in seeing what happens when the VC++ program is run on the same machine as the BCB program.

One of the tricks I've seen to get around this is to write to a buffer on the hard drive. I don't know if this would work in your cases, though.


James P. Cottingham
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