[asterisk-users] Asterisk AGI issues (at high load)

[Vinícius Fontes]

I agree when people say that your problem is at the database and not Asterisk/AGI. Another thing came into my mind, thought: you're using G729 to your SIP peers, and that means Asterisk is doing all the transcoding.

How much idle CPU % top reports at high load? If this is too high (like 90%) you would need a dedicated transcoder: http://www.digium.com/en/products/voice/tc400b.php



Vinícius Fontes
www.asteriskforum.com.br - Informações e discussão sobre Asterisk e telefonia IP



----- "Deepak" <dlalmtl at gmail.com> escreveu:

> Hi, we are experiencing a strange issue and I am hoping someone can
> point me to the right direction or help out with some pointers.
> 
> We have asterisk 1.6.0.6 with a sangome a104DE card. We have basically
> 4 T1's for a total of DAHDI 96 channels.
> 
> We have an agi application (php) that acts as a kind of a calling card
> application.
> 
> All users are SIP users that make calls and asterisk then bridges the
> calls over T1 to the PSTN (after running agi script). Codec between
> SIP clients and Asterisk is G729 (96 G729 licenses installed on
> Asterisk).
> 
> System has 12 GB of RAM.
> 
> 
> What we are seeing is the following:
> 
> 1) All is fine till about 70 calls (70 active calls as displayed by
> core show channels). But as soon as traffic increases, we see the the
> a lot of AGI Processes are running and the number of active calls
> keeps on GROWING to 120, 130, ... . THis makes no sense since we can
> have a maximum of 96 active calls (4 T1). People calling start
> experiencing delays (10-15 seconds before calls are answered or
> connected, etc.). Upon doing a "ps -ef" we see a lot of AGI processes
> running that seem to keep growing
> 
> 2) At that state, if we "Decrease" traffic, the number of active calls
> starts going down and the system becomes "normal" again.
> 
> 3) What we are seeing are NOT Zombie processes though. It is "as-if"
> AGI processes are not exiting when traffic increases. But as soon as
> traffic decreases things become normal.
> 
> 4) We did follow standard suggestions for AGI scripts (exit,
> Softhangup, etc)
> 
> 5) We checked and the CPU utilization seems to be 25% idle at high
> loads.. so it does not seem like a CPU issue. We have a dual core
> 3.0GHz intel processor and based upon benchmarking info, we should be
> easily able to handle 96 calls (with transcoding).
> 
> 6) We see that each AGI process takes up 149 MB of Virtual Memory when
> it is forked for each call.
> 
> 7) Asterisk is taking up 500 MB Of VM.
> 
> 
> *Any* suggestions/help will be appreciated and I'd be happy to even
> pay if someone is ready to help us resolve this issue we are having.
> 
> Thanks
> 
> 
> 
> 
> 
> 
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