public void TestSpeed()
{
float[] orig = new float[32 * 1024 * 1024];
float density = 0.4f;
var rand = new Random();
int idx = 0;
while ((float)rand.NextDouble() > density)
{
idx++;
}
int count = 0;
while (idx < orig.Length)
{
orig[idx] = (float)rand.NextDouble();
count++;
idx += 1;
while ((float)rand.NextDouble() > density)
{
idx++;
}
}
Assert.True(count > 100 && count < orig.Length / 2, "count was bad: " + count);
Console.WriteLine("float array with " + count + " out of " + orig.Length + " non-zero values");
var sparse = new SparseFloatArray(orig);
for (int i = 0; i < orig.Length; i++)
{
float o = orig[i];
float s = sparse.Get(i);
Assert.True(o == s, "orig " + o + " wasn't the same as sparse: " + s + " for i = " + i);
}
// things came out correct
long markTime = System.Environment.TickCount;
for (int i = 0; i < orig.Length; i++)
{
float f = orig[i];
}
long elapsedTimeOrig = System.Environment.TickCount - markTime;
markTime = System.Environment.TickCount;
for (int i = 0; i < orig.Length; i++)
{
float f = sparse.Get(i);
}
long elapsedTimeSparse = System.Environment.TickCount - markTime;
double ratio = (double)elapsedTimeSparse / (double)elapsedTimeOrig;
Console.Write("fyi on speed, direct array access took ");
Console.Write(elapsedTimeOrig);
Console.Write(" millis, while sparse float access took ");
Console.Write(elapsedTimeSparse);
Console.Write("; that's a ");
Console.Write(ratio);
Console.Write(" X slowdown by using the condensed memory model (smaller number is better)");
Console.WriteLine();
Console.WriteLine(" success!");
}
public void TestSpeed()
{
float[] orig = new float[32 * 1024 * 1024];
float density = 0.4f;
var rand = new Random();
int idx = 0;
while ((float)rand.NextDouble() > density)
{
idx++;
}
int count = 0;
while (idx < orig.Length)
{
orig[idx] = (float)rand.NextDouble();
count++;
idx += 1;
while ((float)rand.NextDouble() > density)
{
idx++;
}
}
Assert.True(count > 100 && count < orig.Length / 2, "count was bad: " + count);
Console.WriteLine("float array with " + count + " out of " + orig.Length + " non-zero values");
var sparse = new SparseFloatArray(orig);
for (int i = 0; i < orig.Length; i++)
{
float o = orig[i];
float s = sparse.Get(i);
Assert.True(o == s, "orig " + o + " wasn't the same as sparse: " + s + " for i = " + i);
}
// things came out correct
long markTime = System.Environment.TickCount;
for (int i = 0; i < orig.Length; i++)
{
float f = orig[i];
}
long elapsedTimeOrig = System.Environment.TickCount - markTime;
markTime = System.Environment.TickCount;
for (int i = 0; i < orig.Length; i++)
{
float f = sparse.Get(i);
}
long elapsedTimeSparse = System.Environment.TickCount - markTime;
double ratio = (double)elapsedTimeSparse / (double)elapsedTimeOrig;
Console.Write("fyi on speed, direct array access took ");
Console.Write(elapsedTimeOrig);
Console.Write(" millis, while sparse float access took ");
Console.Write(elapsedTimeSparse);
Console.Write("; that's a ");
Console.Write(ratio);
Console.Write(" X slowdown by using the condensed memory model (smaller number is better)");
Console.WriteLine();
Console.WriteLine(" success!");
}
