StackOverflow2013

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POHow can I allocate all the availble memory in visual studio for my application?
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copied!<p>I want to render 4 millions triangles in my windows based software which is written in Visual Studio C++ 2010 (Build in Release Mode). When I render 3.9 millions triangles, the total RAM memory consumed by the software is 400MB. But when I try to render 4 millions triangles (just 100K more), the system gives me an error. </p> <pre><code>For Example: Point *P = new (std::nothrow) Point[nb_triangles]; //==> "(std::nothrow)" is for catching the run time memory allocation error. (Point is X, Y, Z floats) If(P == NULL) message("System can't allocate this much memory."); // System gives me this error. It means the system can't reserve huge memory for this operation. </code></pre> <p>I have to allocate memory for vertices, face normals, vertex normals, etc. </p> <p>Actually what I am not getting is, I have 8 GB RAM memory, (but in 32 bit XP windows = 3.2GB memory), and the software is just reserved 400MB, the free memory is more than 1 GB, but when I try to render just 100K triangles more, it gives me an error. Why it is giving me an error? because it still has more than 1 GB free RAM memory?</p> <p>Is there anyway to fix this issue, how can I allocate all the available memory for my application ? Because of this issue, I have to make a limit in the software just for rendering 3.9 millions triangles and it is not good.</p> <p>And one more question in my mind is, c++ "new" operator for memory allocation giving me error, how about c "malloc" operator ? can "malloc" fix this issue, is there any diffirence between these two?</p> <p>Please guide me. Thanks.</p> <p><strong>Update # 1:</strong> </p> <p>I have tried a lot, modify the code, remove memory leaks, etc, but I can not allocate memory more than 4 millions. Its not possible to change my whole code into "vector". I can't change into "vector", I have to stuck on my own data structure now with "new". Following are the pointers that I want to allocate in order to render 1 object. </p> <pre><code>P = new points[10000000]; // points is the class with 3 floats X, Y, Z; N = new Norm[10000000]; // Norm is the class with 3 floats X, Y, Z; V = new vNorm[10000000]; // vNorm is the class with 3 floats X, Y, Z; T = new Tri[10000000]; // Tri is the class with 3 integers v1, v2, v3; </code></pre>

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