What does dotTrace Performance Profiler mean [Garbage Collection]?

Question

What does [garbage collection] mean in this figure? And the thing "20 calls"?

I mean, how can I understand why GC takes so long? Was it going to collect many small items? Is one big? Any tips on how to optimize this at all?

This code:

private void DeserializeFrom(SerializationInfo info)
{
    Width = info.GetInt32("width");
    Height = info.GetInt32("height");
    var data = (List<byte>)info.GetValue("cells", typeof(List<byte>));
    cells = new Cell[physicalSize.Width, physicalSize.Height];
    int pos = 0;
    for (int x = 0; x < physicalSize.Width; x++)
    {
        for (int y = 0; y < physicalSize.Height; y++)
        {
            cells[x, y] = new Cell();
            if (x < Width && y < Height)
            {
                cells[x, y].HasCar = data[pos];
                pos++;
            }
        }
    }
}

Nothing special. I suspect that the culprit is a large object List<byte>, but I thought that collecting one large object should be instantaneous (as opposed to collecting a heap of small objects).

Answer 1

, GC, , dotMemory. : https://confluence.jetbrains.com/display/NETCOM/Tutorial+3+-+How+to+Optimize+Memory+Traffic+with+dotMemory

Answer 2

, .Net, , , .Net , , C ++.

- , . .

, , doTrace ( 6), , . https://www.jetbrains.com/profiler/help/CLR_Activity.html