/// <summary>
/// Initializes the process (necessary for constructor overload)
/// </summary>
/// <param name="name">Name of the rpocess</param>
/// <param name="ioProbability">I/O Probability of the process</param>
/// <param name="ioSwiftness">I/O Swiftness of the process</param>
/// <param name="length">Length of the process</param>
private void InitializeProcess(string name, double ioProbability, IO.Speed ioSwiftness, int length)
{
if (name.Length < 2 || name.Length > 15)
{
throw new ArgumentException("Parameter must be between 2 and 15 character", "Process Name");
}
if (ioProbability < 0 || ioProbability > 1)
{
throw new ArgumentException("Parameter must be between 0 and 1", "I/O Probability");
}
if (length <= 0)
{
throw new ArgumentException("Parameter must be greater than 0", "Process Length");
}
this.name = name;
this.ioSwiftness = ioSwiftness;
this.ioProbability = ioProbability;
this.length = length;
cpuTime = 0;
waitTime = 0;
ioTime = 0;
ioCount = 0;
remainingTick = length;
}
/// <summary>
/// Process constructor
/// </summary>
/// <param name="name">Name of the process</param>
/// <param name="ioProbability">I/O Probability of the process (in percent)</param>
/// <param name="ioSwiftness">I/O Swiftness of the process</param>
/// <param name="length">Process length</param>
public Process(string name, int ioProbability, IO.Speed ioSwiftness, int length)
{
if (ioProbability < 0 || ioProbability > 100)
{
throw new ArgumentException("Parameter must be between 0 and 100", "I/O Probability");
}
InitializeProcess(name, (double)ioProbability / 100, ioSwiftness, length);
}
/// <summary>
/// This function starts an I/O operation.
/// </summary>
private void AddIO()
{
//There is no I/O operation
if (currentIO == null)
{
//Process has a chance to get I/O operation (normal distribution, 5% deviation, Box-Muller transform)
Random random = new Random();
double u1 = 1.0 - random.NextDouble();
double u2 = 1.0 - random.NextDouble();
double randStdNormal = Math.Sqrt(-2.0 * Math.Log(u1)) * Math.Sin(2.0 * Math.PI * u2);
double randNormal = ioProbability + 0.05 * randStdNormal;
double rand = random.NextDouble();
if (rand <= randNormal)
{
//Our process wants I/O operation
ioCount++;
//Determine speed of operation (80% chance to get ioSwiftness speed, 10-10% the other two)
int randomSwiftness = random.Next(0, 9);
IO.Speed speed = IO.Speed.FAST;
if (randomSwiftness < 8)
{
speed = ioSwiftness;
}
else
{
// This is overkill
// Cycles between enum values
// -- Adds randomSwiftness - 7 to currentSwiftness
// -- Wraps around enum values (e.g., If enum has 3 values, then 3 + 1 == 0)
speed = (IO.Speed)((randomSwiftness - 7 + (int)ioSwiftness) % Enum.GetValues(typeof(IO.Speed)).Length);
}
currentIO = new IO(speed);
}
}
}
/// <summary>
/// Process constructor
/// </summary>
/// <param name="name">Name of the process</param>
/// <param name="ioProbability">I/O Probability of the process</param>
/// <param name="ioSwiftness">I/O Swiftness of the process</param>
/// <param name="length">Process length</param>
public Process(string name, double ioProbability, IO.Speed ioSwiftness, int length)
{
InitializeProcess(name, ioProbability, ioSwiftness, length);
}