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

[David Woodfall]

On (21/03/14 13:54), Steve Totaro <stotaro at totarotechnologies.com> put forth the proposition:
>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.

I'm using confbridge on asterisk 11.

>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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