Number of threads

[Frank Fock]

Hello Helge,

If you are using AGENT++ v3.5 or later, the maximum number of
concurrent threads is limited to 4 by default. You can use a different
sized thread pool by creating a new ThreadPool instance with your
maximum threads and stack size value and then assigning that pool
to your Mib instance before entering the main loop. The method
is Mib::set_thread_pool(..).

Other comments inline:

Helge Fredriksen wrote:

> Hello!
>
> I'm looking for a possibility for looking at how many threads are currently
> running in the agent. Any API call that will do the trick, or must I modify
> something in your code to achieve this?
>

Since it is impossible to get an exact snapshot of how many threads are
running, I have not implemented such a method. However theThreadPool
class has a method "is_idle()" which can be used to determine if there
is any thread running. You may subclass the ThreadPool class to get the
actual count of running threads.

>
> Is there a limit to how many concurrent requests an agent might handle?

Before v3.5 the answer would be no. For v3.5 or later see above.

>
> Any possibility that the number of threads will build up because of a hang
> situation on a mutex?

Not in v3.5.

>
>
> Also, we are running a fork/exec inside one of your threads, and sometimes
> we experience that the child process get's a SIGSEGV before getting to exec.
> Could this be due to a too little stacksize of the thread? The problem
> seemed to be lesser when we reduced the number of SNMP calls towards the
> agent while the fork/exec was taking place.

As pointed out above, you may increase the stack size and see if it then
runs better.

Best regards,
Frank