Reputation: 43

C#: Use up almost all memory

My goal is to reach a point where I have filled up all available memory (note that I want to do this incrementally, so before my last allocation I have a minimal memory remaining). How can I do this?

Upvotes: 4

Answers (8)

Cecil Has a Name

Reputation: 4992

var junk = new LinkedList<byte[]>();
int allocSize = 100 * 1024 * 1024; // 100 MiB
while (allocSize > 0)
{
    try
    {
        junk.AddLast(null);
        junk.Last.Value = new byte[allocSize];
    }
    catch (OutOfMemoryException)
    {
        allocSize = (allocSize - 1) / 2;
    }
}

Upvotes: 2

Merlyn Morgan-Graham

Reputation: 59101

The scenario you are talking about sounds like it might be for testing an application.

You may want to look into load/stress testing tools. LoadRunner is the first one that comes to mind. It's not "in C#", and I am pretty sure it isn't free, but it may be the right tool for the job. Also, you may want to look into fault injection, if you all you want to see is how your program handles an OutOfMemory exception.

For exactly what you asked about, here's an article with an application that consumes RAM: http://msdn.microsoft.com/en-us/magazine/cc163613.aspx

Upvotes: 1

Jack

Reputation: 43

        int size = 1024;
        var bytes = new List<byte[]>();
        while (true)
        {
            try
            {
                bytes.Add(new byte[size]);
            }
            catch
            {                   
                if (size == 1)
                {
                    throw;
                }
                size = size / 2;
            }
        }

Upvotes: 0

Jader Dias

Reputation: 90465

The LINQ way:

Enumerable.Range(0, int.MaxValue).ToArray();

Upvotes: 0

Pavel Minaev

Reputation: 101555

for (object[] o = null;; o = new[] { o });

Upvotes: 10

REA_ANDREW

Reputation: 10764

Keep adding a large buffer to a memory stream inside a while loop .

Upvotes: 0

ChaosPandion

Reputation: 78252

Maybe something like this?

var bytes = new List<byte[]>();
var time = new TimeSpan(100);
while (true)
{
    bytes.Add(new byte[1024]);
    Thread.Sleep(time);
}

Upvotes: 0

Anon.

Reputation: 60008

One option would be to create a list of some kind, and just keep adding junk to it in an infinite loop.

Depending on the precision needed, though, that could take a while - one option for speeding it up would be adding large structs to the list elements initially, then catching the OutOfMemoryError and trying again with smaller stuff until you've got the precision you need.

Upvotes: 4

C#: Use up almost all memory

Answers (8)

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