threads

It would help if you did specify exactly what error is shown (call stack)
and some code that illustrates how you 'create' your threads in the pool.

Willy.

"Tpool" <an*******@discussions.microsoft.com> wrote in message
news:eB**************@TK2MSFTNGP09.phx.gbl...

hi,
How to create the more than 25 threads in threadpool. i tried more than 25
threads in web request, but it shows an error. how can i have my threads
to some 25 or more ,check the status of the threads, and assigning the
task to completed threads in a loop.
Thanks

Tpool,

You shouldn't play around with the threadpool, or the maximum number of
threads that it uses. You are going to absolutely kill performance if you
set the max number of concurrent threads higher.

You can send as many tasks as you want to the thread pool. Is there a
reason you want to execute more than 25 at a time (per processor,
approximately)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com
"Tpool" <an*******@discussions.microsoft.com> wrote in message
news:eB**************@TK2MSFTNGP09.phx.gbl...

hi,
How to create the more than 25 threads in threadpool. i tried more than 25
threads in web request, but it shows an error. how can i have my threads
to some 25 or more ,check the status of the threads, and assigning the
task to completed threads in a loop.
Thanks

Tpool <an*******@discussions.microsoft.com> wrote:

How to create the more than 25 threads in threadpool. i tried more than 25
threads in web request, but it shows an error. how can i have my threads to
some 25 or more ,check the status of the threads, and assigning the task to
completed threads in a loop.

The system thread pool will only contain 25*number of processors
threads, and there's nothing you can easily do about that. However, you
don't need to use the system thread pool to create threads.

See http://www.pobox.com/~skeet/csharp/threads

You can even write your own thread pool without too much difficulty.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

"Jon Skeet [C# MVP]" <sk***@pobox.com> wrote in message
news:MP************************@msnews.microsoft.c om...

Tpool <an*******@discussions.microsoft.com> wrote:

How to create the more than 25 threads in threadpool. i tried more than
25
threads in web request, but it shows an error. how can i have my threads
to
some 25 or more ,check the status of the threads, and assigning the task
to
completed threads in a loop.

The system thread pool will only contain 25*number of processors
threads, and there's nothing you can easily do about that. However, you
don't need to use the system thread pool to create threads.

See http://www.pobox.com/~skeet/csharp/threads

You can even write your own thread pool without too much difficulty.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Jon,

The number of worker threads in the pool is actually "25 per processor per
process", while the number of IOC threads in the pool is 1000 per processor
per process. Note that these are figures valid for V1.1.

Willy.

Actually i am creating more because, i want to check the number of urls, it
takes so much time when do this by ordinary methods, so i decided to go with
the threads. Here with attached the sample code. in that i can able to
create threads but unable to assign the task to the completed threads.

thanks in advance

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:Ot**************@TK2MSFTNGP10.phx.gbl...

It would help if you did specify exactly what error is shown (call stack)
and some code that illustrates how you 'create' your threads in the pool.

Willy.

"Tpool" <an*******@discussions.microsoft.com> wrote in message
news:eB**************@TK2MSFTNGP09.phx.gbl...

hi,
How to create the more than 25 threads in threadpool. i tried more than
25
threads in web request, but it shows an error. how can i have my threads
to some 25 or more ,check the status of the threads, and assigning the
task to completed threads in a loop.
Thanks

Hmm... I see no code in the attachment.

Tpool,

I have made the following simple changes (see comments ) ....
obj.CheckUrls();
Console.ReadLine(); //**** Somehow you need to block the main thread,
I've used this for test purposes, but you need to use some other signaling
technique in production code.
}

public void CheckUrls()
{
for(int i =0;i<arr_URLList.Count;i++)
{
//**** Here I removed the workingThreads check as you never decrement this
number you will end executing DoEvents() in an endless loop just burning CPU
cycles, note that you should NEVER call DoEvents() in a non Windows Forms
application.
//**** Also you don't have to limit the work items queued (apart from memory
consumption constraints), this number can be much higher than the number
threads in the pool.
System.Threading.ThreadPool.QueueUserWorkItem(call Url,(object)arr_URLList[i]);
workingThreads++; // this is the number of queued items, NOT the
number of threads taken from the pool (max 25)
Console.WriteLine("the thread number " + i);
}
}

But I don't like the idea of queuing webrequests against the Workerthread
pool, you should definitely try to use the asynchronous programming model
based on asynch. delegates (see BeginGetResponse in msdn) when executing
network (or any other kind of IO) requests.

Willy.

"Tpool" <an*******@discussions.microsoft.com> wrote in message
news:%2***************@TK2MSFTNGP12.phx.gbl...

sorry for the mistake
i attached again.

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:uO**************@TK2MSFTNGP12.phx.gbl...

Hmm... I see no code in the attachment.

hi nair,

Thanks for the suggestion, i will implement and let you know the results.
Meanwhile do you have any sample codes for this ?.

"Nair" <Na**@discussions.microsoft.com> wrote in message
news:A7**********************************@microsof t.com...

Hi TP,

Here is what I have done once.

It is better even if you want to create more than 25 threads, keep the
thread control in your program

1. Create a thread array of how many you want. Lets say we need to create
only 35 threads.
2. As an when the job needs to be done, trigger a thread and increase the
running thread to 1.
3. In the thread callback, once the thread is done decrease the counter
back
to one (Make sure the increasing and decreasing is under lock)
4. Before submitting the job to be trigger check and see if there are
threads available to trigger if not put the job in a queue.
5. Add a timer and let the timer wake up every 2 minutes or so (It should
be
fined tuned based on the job executing time). It should check the trigger
array to see if there are threads available to execute. If there are then
dequeue the job and submit it for execution.

With this approach, you handle the maximum list and control the job
execution as well. If you have any questions please let me know.
Thanks.
Nair

"Nair" wrote:

HI Tp,

Just curious why do you want to create more than 25 threads? Also how
many
processors are in the system you are trying? If it is a single processor
and
it is not a dedicated system to do what you are trying to do, then I
would
suggest not to do that.

Thanks.

"Tpool" wrote:

> hi,
> How to create the more than 25 threads in threadpool. i tried more than
> 25
> threads in web request, but it shows an error. how can i have my
> threads to
> some 25 or more ,check the status of the threads, and assigning the
> task to
> completed threads in a loop.
> Thanks
>
>
>

hi,

I am struggling to find the solution, it would be great help if you get some
sample code.

Thanks
"Nair" <Na**@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com...

I am at home, I will try to send a sample code this evening or tomorrow
morning.
Thanks.

"Tpool" wrote:

hi nair,

Thanks for the suggestion, i will implement and let you know the results.
Meanwhile do you have any sample codes for this ?.

"Nair" <Na**@discussions.microsoft.com> wrote in message
news:A7**********************************@microsof t.com...

> Hi TP,
>
> Here is what I have done once.
>
> It is better even if you want to create more than 25 threads, keep the
> thread control in your program
>
> 1. Create a thread array of how many you want. Lets say we need to
> create
> only 35 threads.
> 2. As an when the job needs to be done, trigger a thread and increase
> the
> running thread to 1.
> 3. In the thread callback, once the thread is done decrease the counter
> back
> to one (Make sure the increasing and decreasing is under lock)
> 4. Before submitting the job to be trigger check and see if there are
> threads available to trigger if not put the job in a queue.
> 5. Add a timer and let the timer wake up every 2 minutes or so (It
> should
> be
> fined tuned based on the job executing time). It should check the
> trigger
> array to see if there are threads available to execute. If there are
> then
> dequeue the job and submit it for execution.
>
> With this approach, you handle the maximum list and control the job
> execution as well. If you have any questions please let me know.
> Thanks.
> Nair
>
> "Nair" wrote:
>
>> HI Tp,
>>
>> Just curious why do you want to create more than 25 threads? Also how
>> many
>> processors are in the system you are trying? If it is a single
>> processor
>> and
>> it is not a dedicated system to do what you are trying to do, then I
>> would
>> suggest not to do that.
>>
>> Thanks.
>>
>> "Tpool" wrote:
>>
>> > hi,
>> > How to create the more than 25 threads in threadpool. i tried more
>> > than
>> > 25
>> > threads in web request, but it shows an error. how can i have my
>> > threads to
>> > some 25 or more ,check the status of the threads, and assigning the
>> > task to
>> > completed threads in a loop.
>> > Thanks
>> >
>> >
>> >