Subj : Re: Number of Threads on XP
To   : comp.programming.threads
From : Scott McPhillips [MVP]
Date : Wed Feb 16 2005 12:58 am

barbell wrote:
> Hi,
> 
> Is there any top limit on how many threads you should launch in an 
> application ?
> 
> I am fully aware of the 'disadvantage' of having more than one thread on a 
> single CPU, but if the threads mostly are wating and not active all the 
> time - is it then a problem to have lets say....100 threads launched ? 
> 
> 

There is a practical limit, because each thread consumes some of the 
application's address space.  The default stack size is 1 MB, so 100 
threads take 100 MB of your application's 2 GB max addresses before they 
even do anything useful.  That's not horrible, but obviously 1000 
threads would be horrible.

There is a more common practical limit at 64 threads.  That is the max 
number you can wait on in WaitForMultipleObjects.

-- 
Scott McPhillips [VC++ MVP]

.