[sr-dev] ASYNC module - CPU load

[Alex Balashov]

‎I agree that it seems to be a peculiarity of virtualisation; I haven't reproduced this on bare metal. But it's a bit odd when it appears in KVM, Xen, and, evidently, per Olle's report, VMware, despite the fact that these are all rather different implementations.

--
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Sent from my BlackBerry.
  Original Message  
From: Daniel-Constantin Mierla
Sent: Monday, April 20, 2015 11:49
To: Kamailio (SER) - Development Mailing List
Reply To: miconda at gmail.com
Subject: Re: [sr-dev] ASYNC module - CPU load

IIRC, the issue appeared to be related to virtualization, because the
the process should have been blocked in I/O state by recvfrom().

Anyhow, to confirm this, look at the process using lot of cpu with gdb
and get the backtrace:

gdb /path/to/kamailio PID
bt

Cheers,
Daniel

On 20/04/15 11:24, Alex Balashov wrote:
> I encountered the identical condition inside VirtualBox and remarked upon it to the list previously. This is why I had to revert to rtimer + mqueue + tm_suspend/continue manual approaches.
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
> 303 Perimeter Center North, Suite 300
> Atlanta, GA 30346
> United States
>
> Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
> Sent from my BlackBerry.
> Original Message 
> From: Olle E. Johansson
> Sent: Monday, April 20, 2015 03:58
> To: Kamailio (SER) - Development Mailing List
> Reply To: Kamailio (SER) - Development Mailing List
> Subject: [sr-dev] ASYNC module - CPU load
>
> Good morning!
>
> In one installation where Kamailio runs in a VMware virtual machine we use Async in a registrar.
>
> There's no traffic - only one SIP device registred - but the CPU load goes up. 
>
> If we change the workers to 1 CPU load goes down, if we set it to 8 CPU load average quickly goes up to 3. If we add a second CPU, nothing changes. Again, with no traffic. The CPU load is directly related to number of workers, but not if they are used or not.
>
> My conclusion is that something in the Async module is causing CPU load regardless of traffic - primarily depending on the number of workers.
>
> I don't think that's the correct behaviour ;-)
>
> Kamailio 4.2.0
>
> Cheers,
> /O
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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com


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