Ian ,
Just for information here are the times for a little prog I wrote it is
interesting that there is an optomisation in Thread.Start() when starting
mutliple threads to the same delgate. The first one takes 40 ms and later
ones are very quick (occasionaly the second one takes 10ms) . ThreadPools
are quicker when doing different types of work but you dont seem to get this
optomisation.
Anyone knows why this occurs is my code wrong ?
I do agree threads are a precious resource and should not be wasted but they
are not that expensive.
Ben
Thread class Initialize Time0 ms
Thread Start time40ms
Thread class Initialize Time0 ms
Thread Start time0ms
Thread class Initialize Time0 ms
Thread Start time0ms
Thread class Initialize Time0 ms
Thread Start time0ms
Thread class Initialize Time0 ms
Thread Start time0ms
Now using 5 time to do total
Thread class Initialize Time0 ms
Thread class Initialize Time0 ms
Thread class Initialize Time0 ms
Thread Start time0ms
Thread Start time0ms
Thread Start time0ms
Thread class Initialize Time10 ms
Thread class Initialize Time10 ms
Thread Start time10ms
Thread Start time10ms
Now using ThreadPool
Worker Thread Start time10ms
Worker Thread Start time100144 Tics
Worker Thread Start time20ms
Worker Thread Start time200288 Tics
Worker Thread Start time20ms
Worker Thread Start time200288 Tics
Worker Thread Start time20ms
Worker Thread Start time200288 Tics
Worker Thread Start time20ms
Worker Thread Start time200288 Tics
Machine is 700 Mhz Duron
using System;
using System.Threading;
namespace ThreadTest
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
static DateTime startTime;
static public void Test()
{
TimeSpan span = DateTime.Now- startTime;
Console.WriteLine("Thread Start time" +
span.Milliseconds.ToString() +
"ms");
}
public static void ThreadTest(Object O)
{
TimeSpan span = DateTime.Now- startTime;
Console.WriteLine("Worker Thread Start time" +
span.Milliseconds.ToString() + "ms");
Console.WriteLine("Worker Thread Start time" +
(span.Ticks).ToString() +
" Tics");
}
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
Thread testThread;
ThreadStart start = new ThreadStart(Class1.Test);
for ( int i = 0 ; i < 5 ; i ++)
{
startTime = DateTime.Now;
testThread = new Thread(start);
TimeSpan span = DateTime.Now- startTime;
Console.WriteLine("Thread class Initialize Time" +
span.Milliseconds.ToString() + " ms");
testThread.Start();
Thread.Sleep(1000);
}
Thread.Sleep(1000);
startTime = DateTime.Now;
// ThreadPool threadPool = new ThreadPool();
Console.WriteLine("Now using 5 time to do total");
for ( int i = 0 ; i < 5 ; i ++)
{
testThread = new Thread(start);
TimeSpan span = DateTime.Now- startTime;
Console.WriteLine("Thread class Initialize Time" +
span.Milliseconds.ToString() + " ms");
testThread.Start();
}
Thread.Sleep(1000);
startTime = DateTime.Now;
// ThreadPool threadPool = new ThreadPool();
Console.WriteLine("Now using ThreadPool");
for ( int i = 0 ; i < 5 ; i ++)
{
ThreadPool.QueueUserWorkItem(new
WaitCallback(ThreadTest));
}
String key = Console.ReadLine();
}
}
}
-----Original Message-----
From: Moderated discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED]]On Behalf Of Ben Kloosterman
Sent: Tuesday, 11 June 2002 6:12 PM
To: [EMAIL PROTECTED]
Subject: Re: [ADVANCED-DOTNET] Threading is blocking itself or ?
Ian ,
I Agree on most of your points except this one .
>> In this case I may be wrong as the initialization cost of your class may
>> be quite high . It may be more efficient to intialize it once and send
the
>> 50 messages in a loop.
>
>I suspect the class initialization cost will be low compared to the cost of
> creating a thread.
His class intialization is doing a network login - the cost of creating a
thread is no where near that high - some code Ive got creates a thread and
gets a DataSet from a middleTier and takes about 50ms.
Ben
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