MemEater

MemEater.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;


namespace MemEater
{
	static class MainClass
	{
		private const Int64 Kilobyte = 1024;
		private const Int64 Megabyte = Kilobyte * 1024;
		private const Int64 Gigabyte = Megabyte * 1024;

		public static string StrSize(Int64 bytes)
		{
			if (bytes >= Gigabyte) {
				return $"{bytes /(float) Gigabyte: 0.##} Gbytes ({bytes} bytes)";
			}
			if (bytes >= Megabyte) {
				return $"{bytes / (float)Megabyte: 0.##} Mbytes ({bytes} bytes)";
			}
			if (bytes >= Kilobyte) {
				return $"{bytes / (float)Kilobyte: 0.##} Kbytes ({bytes} bytes)";
			}
			return $"{bytes} bytes";
		}
		public static void Main (string[] args)
		{
			var start = DateTime.Now;
			
			Int64 step = Megabyte;
			if (args.Length == 1) {
				step = int.Parse (args [0]);
			}
			Console.WriteLine ("Increment size: " + step + " bytes");

			var items = new List<byte[]> ();
			while(true) {
				var data = new byte[step];
				items.Add (data);
				for (var j = 0; j < data.Length; j += 10) {
					data [j] = 10;
				}
				
				if ((DateTime.Now - start).Seconds > 5)
				{
					start = DateTime.Now;
					Console.WriteLine ("Items: " + items.Count);
//					Console.WriteLine("Memory: " + StrSize(GC.GetTotalMemory (true)));
					Process currentProc = Process.GetCurrentProcess();
					Console.WriteLine ("Process size: " + StrSize(currentProc.PrivateMemorySize64));
					Console.WriteLine ();
				}
			}
		}
	}
}

usage.txt

Usage: 
mono MemEater.exe [step_in_bytes, default 1MB]