[asterisk-users] Need more meetme users -- hitting some limit

[Steve Totaro]

I found below here:  http://www.voip-info.org/wiki/view/Asterisk+cmd+MeetMe

If you have too many conferences, one CPU may not be able to mix all the
audio and you will have audio problems even if there are 7+ other CPUs that
are essentially idle while waiting for one CPU to mix everything. You
should be able to handle 512 conference participants on a modern server
system without problem. The current trunk of *DAHDI linux limits the number
of open pseudo channels to 512 for this reason*. [1]

Thanks,
Steve T

[1] http://svn.asterisk.org/view/dahdi?view=revision&revision=9610

The new ConfBridge module in the upcoming Asterisk 1.10 release may not
have this limitation.


On Fri, Mar 21, 2014 at 11:53 AM, Steve Edwards
<asterisk.org at sedwards.com>wrote:

> I'm trying to determine the capacity of my host running Asterisk 11.8.1 on
> CentOS 6.5.
>
> The host is an Intel E3-1240v3 with 8GB RAM, an SSD, and gigabit Ethernet.
>
> The primary application will be bridging groups of users using meetme().
>
> I'm using 2 boxes -- 1 to initiate calls using call files (box1), and 1
> behaving a bit more like a production box -- bridging calls (box2).
>
> The call file on box1 originates a call to box2 and then plays a 2 hour
> WAV file.
>
> The dialplan on box2 drops the call into a meetme, creating the room name
> from the last 2 digits of the current call count -- distributing the calls
> into 100 meetmes.
>
> When I run a script to create 500 call files on box1, box2 starts
> complaining at 312 calls, logging 'Unable to open DAHDI pseudo channel:
> Cannot allocate memory' on the console.
>
> From the 'callers perspective' the call is dropped between 'There are
> currently x other participants in the conference' and the 'beep-beep.'
>
> 'top' says Asterisk is only using about 1/2 gigabyte of RAM.
>
> 'top' says Asterisk is using about 250% of the CPU (4 physical, 8 logical
> cores).
>
> 'ulimit' (added to /usr/sbin/safe_asterisk in the run_asterisk() function)
> says the open file limit is 397,006.
>
> 'ls -l /proc/$(cat /var/run/asterisk/asterisk.pid)/fd | wc -l' says
> Asterisk only has 2,194 files open.
>
> 'iftop' sees about 24Mb of bandwidth in each direction between the boxes.
>
> Using confbridge() I can easily get 3,000 calls (14,869 open files, 180Mb
> bandwidth), but I'd lose some functionality and have to re-write parts of
> my application.
>
> Any clues of what limit I'm hitting and how to increase it?
>
> --
> Thanks in advance,
> -------------------------------------------------------------------------
> Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
> Newline                                              Fax: +1-760-731-3000
>
>
> --
> Thanks in advance,
> -------------------------------------------------------------------------
> Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
> Newline                                              Fax: +1-760-731-3000
>
> --
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