C# huge size 2-dim arrays
- by 4eburek
I need to declare square matrices in C# WinForms with more than 20000 items in a row.
I read about 2GB .Net object size limit in 32bit and also the same case in 64bit OS.
So as I understood the single answer - is using unsafe code or separate library built withing C++ compiler.
The problem for me is worth because ushort[20000,20000] is smaller then 2GB but actually I cannot allocate even 700MB of memory. My limit is 650MB and I don't understand why - I have 32bit WinXP with 3GB of memory.
I tried to use Marshal.AllocHGlobal(700<<20) but it throws OutOfMemoryException, GC.GetTotalMemory returns 4.5MB before trying to allocate memory.
I found only that many people say use unsafe code but I cannot find example of how to declare 2-dim array in heap (any stack can't keep so huge amount of data) and how to work with it using pointers.
Is it pure C++ code inside of unsafe{} brackets?
Could you please provide a small example of working with matrices using pointers in unsafe code.
