Re: [Boost-users] threads - thread_resource_error thrown by creating more than 256 threads

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-12-06 13:04:10

Oliver.Kowalke_at_[hidden] wrote:

>Hi,
>if I try to create more than 255 threads (256 for instance) I get the
>exception thread_resource_error thrown. How can I increase the amount of
>threads?
>My System: Linux  2.4.21, gcc 3.3.1 (posix thread model).
>
>cat /proc/sys/kernel/threads-max --> max 12152 threads per process
>currently allowed
>  
>
You're running into a different kernel limit. By default, Linux gives 
each process 2 GB of virtual address space (on 32-bit architectures) and 
allocates 8 MB of virtual address space for each thread's stack. This 
allows for 255 thread stacks, assuming that the executable and its heap 
are small.

You can get more threads by changing their maximum stack size, but 
Boost.Threads doesn't provide a way to do this. In my opinion it is a 
mistake to create so many threads, though. Why do you think you need so 
many?

Ben.