Brock Allen <[EMAIL PROTECTED]> wrote:
> Was the time the JITer takes to instantiate the generic type taken into
> consideration?
The times we're talking about are large in comparison to instantiation &
JIT time, with the number of repetitions (1 million). FWIW, here's the
times with the first call not timed:
Public & Private are classes:
Activator.Create(typeof(Public)) : 0.148 sec with 1000000 reps
Activator.Create<Public>() : 1.039 sec with 1000000 reps
Activator.Create(typeof(Private)) : 1.994 sec with 1000000 reps
Activator.Create<Private>() : 1.037 sec with 1000000 reps
Public & Private are structs:
Activator.Create(typeof(Public)) : 0.109 sec with 1000000 reps
Activator.Create<Public>() : 0.170 sec with 1000000 reps
Activator.Create(typeof(Private)) : 2.171 sec with 1000000 reps
Activator.Create<Private>() : 0.170 sec with 1000000 reps
Test program:
---8<---
using System;
using System.Diagnostics;
//*
public class Public { public string field1; }
class Private { public string field1; }
/*/
public struct Public { public string field1; }
struct Private { public string field1; }
//*/
public class App
{
delegate void Proc();
const int Repetitions = 1000000;
static void Time(string label, Proc proc)
{
proc(); // warm up / instantiate etc
Stopwatch w = Stopwatch.StartNew();
for (int i = 0; i < Repetitions; ++i)
proc();
Console.WriteLine("{0,-35}: {1,6:f3} sec with {2} reps", label,
w.ElapsedTicks / (double) Stopwatch.Frequency,
Repetitions);
}
static void Main()
{
Time("Activator.Create(typeof(Public))", delegate
{
Public item = (Public)
Activator.CreateInstance(typeof(Public));
});
Time("Activator.Create<Public>()", delegate
{
Public item = Activator.CreateInstance<Public>();
});
Time("Activator.Create(typeof(Private))", delegate
{
Private item = (Private)
Activator.CreateInstance(typeof(Private));
});
Time("Activator.Create<Private>()", delegate
{
Private item = Activator.CreateInstance<Private>();
});
}
}
--->8---
-- Barry
--
http://barrkel.blogspot.com/
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