public unsafe void MeasureTeaFileRawMemoryMappedTick(Runner runner)
{
long N = runner.N;
RawMemoryMapping <Tick> view = null;
File.Delete(filename);
using (var tf = TeaFile <Tick> .Create(filename))
{
for (int i = 0; i < N; i++)
{
tf.Write(new Tick {
Price = i
});
}
}
runner.Measure("memmap raw sum using ticks", () =>
{
using (view = TeaFile <Tick> .OpenRawMemoryMapping(filename))
{
double sum = 0d;
Tick *tick = (Tick *)view.ItemAreaStart;
for (int i = 0; i < N; i++)
{
sum += tick->Price;
tick++;
}
Console.WriteLine(sum);
if (sum != runner.TargetValue)
{
throw new Exception("wrong result");
}
}
});
}
static Statistics GetSessionDataMemMapped(string filename)
{
using (var mf = RawMemoryMapping <Tick> .OpenRead(filename))
unsafe
{
var stats = new Statistics();
Tick * firstTick = (Tick *)mf.ItemAreaStart;
double minPrice = firstTick->Price;
double maxPrice = firstTick->Price;
var session = new TradingSession(firstTick->Time);
stats.Sessions.Add(session);
for (var t = firstTick; t != mf.ItemAreaEnd; t++)
{
if (t->Time >= session.End)
{
session = new TradingSession(t->Time);
stats.Sessions.Add(session);
}
session.TickCount++;
minPrice = Math.Min(t->Price, minPrice);
maxPrice = Math.Max(t->Price, maxPrice);
}
stats.MinPrice = minPrice;
stats.MaxPrice = maxPrice;
return(stats);
}
}
public unsafe void MeasureTeaFileRawMemoryMapped(Runner runner)
{
long N = runner.N;
RawMemoryMapping <double> view = null;
//string copyfilename = "copy" + filename;
//if (File.Exists(copyfilename)) File.Delete(copyfilename);
//File.Copy(filename, copyfilename);
//if(File.Exists(filename)) File.Delete(filename);
runner.Measure("TeaFile<double>.OpenRawMemoryMapping", () =>
{
view = TeaFile <double> .OpenRawMemoryMapping(filename);
});
runner.Measure("memmap raw sum += view[i]", () =>
{
double sum = 0d;
double *p = (double *)view.ItemAreaStart;
for (int i = 0; i < N; i++)
{
sum += *p;
p++;
}
Console.WriteLine(sum);
if (sum != runner.TargetValue)
{
throw new Exception("wrong result");
}
});
runner.Measure("memmap raw sum += view[i] 2nd run", () =>
{
double sum = 0d;
double *p = (double *)view.ItemAreaStart;
for (int i = 0; i < N; i++)
{
sum += *p;
p++;
}
Console.WriteLine(sum);
if (sum != runner.TargetValue)
{
throw new Exception("wrong result");
}
});
runner.Measure("memmap raw sum += view[i] 3rd run", () =>
{
double sum = 0d;
double *p = (double *)view.ItemAreaStart;
for (int i = 0; i < N; i++)
{
sum += *p;
p++;
}
Console.WriteLine(sum);
if (sum != runner.TargetValue)
{
throw new Exception("wrong result");
}
});
runner.Measure("memmap raw sum += view[i] 4th run, pointer only", () =>
{
double sum = 0d;
double *p = (double *)view.ItemAreaStart;
double *end = (double *)view.ItemAreaEnd;
while (p < end)
{
sum += *p;
p++;
}
Console.WriteLine(sum);
if (sum != runner.TargetValue)
{
throw new Exception("wrong result");
}
});
view.Dispose();
view = null;
}
