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PO'System.OutOfMemoryException' was thrown when there is still plenty of memory free
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copied!<p>This is my code:</p> <pre><code>int size = 100000000; double sizeInMegabytes = (size * 8.0) / 1024.0 / 1024.0; //762 mb double[] randomNumbers = new double[size]; </code></pre> <p>Exception: Exception of type 'System.OutOfMemoryException' was thrown.</p> <p><strong>I have 4GB memory on this machine 2.5GB is free</strong> when I start this running, there is clearly enough space on the PC to handle the 762mb of 100000000 random numbers. I need to store as many random numbers as possible given available memory. When I go to production there will be 12GB on the box and I want to make use of it.</p> <p><strong>Does the CLR constrain me to a default max memory to start with? and how do I request more?</strong></p> <p><strong>Update</strong></p> <p>I thought breaking this into smaller chunks and incrementally adding to my memory requirements would help if the issue is due to <strong>memory fragmentation</strong>, but it doesn't <strong>I can't get past a total ArrayList size of 256mb regardless of what I do tweaking blockSize</strong>.</p> <pre><code>private static IRandomGenerator rnd = new MersenneTwister(); private static IDistribution dist = new DiscreteNormalDistribution(1048576); private static List<double> ndRandomNumbers = new List<double>(); private static void AddNDRandomNumbers(int numberOfRandomNumbers) { for (int i = 0; i < numberOfRandomNumbers; i++) { ndRandomNumbers.Add(dist.ICDF(rnd.nextUniform())); } } </code></pre> <p>From my main method:</p> <pre><code>int blockSize = 1000000; while (true) { try { AddNDRandomNumbers(blockSize); } catch (System.OutOfMemoryException ex) { break; } } double arrayTotalSizeInMegabytes = (ndRandomNumbers.Count * 8.0) / 1024.0 / 1024.0; </code></pre>

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