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How to create an extremely large array/object (> 2 GB) without using jagged arrays ?

Posted By:      Posted Date: August 29, 2010    Points: 0   Category :.NET Framework
Hello,I had implemented a matrix scaling algorithm in Java (64-bit) for a university project and have now implemented the code in C# with .NET 3.5 64-bit. One of the operations I did in Java was creating a rectangular array with double[][] = ... (in C# this is a jagged array!) to store a symmetric matrix which is used as input for the algorithm. Since I was using matrices with n up to 30720, memory usage for the single matrix object was around 8 GB in it's maximum and with matrix multiplication around 20 GB.So... now I implemented this in C# and I am shocked to see that double[,] (rectangular arrays) can only be 2 GB in size even on 64-bit! That means that for matrices with n larger than ~15000 I will get OutOfMemory Exceptions although there is a huge amount of free memory (I have two quad core systems with 12 GB and 24 GB Ram). When I use jagged arrays in C# (i.e. double[][]) I can create larger matrices. That is because I have one small array with the size of the row number (i.e. n) and then for each row an array of size n, but they are all single objects so I don't reach the 2 GB per object limit. The problem with jagged arrays is that they are horribly slow for matrice calculations compared to rectangular arrays and even slower compared to single dimension arrays.Actually I intended to rewrite my code and simulate the matrices in single arrays (see sample code below) bec

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