[asterisk-dev] Asterisk modules in C++

[Steve Edwards]

>> On Sun, 9 May 2010, Deepesh D wrote:
>>
>>> Performance is the main reason for switching from AGI to module. Will 
>>> a FastAGI running on the same server as asterisk give me improved 
>>> performance?

> On Sun, May 9, 2010 at 9:09 PM, Steve Edwards

>> While creating a new process is typically a very "expensive" (in CPU 
>> resources) process, any reasonably modern processor can create hundreds 
>> of processes per second.
>>
>> Before switching to FastAGI, why do you think process creation is the 
>> limiting factor in your quest for improved performance?
>>
>> How about some details about exactly what you are doing and what your 
>> AGIs are doing?

On Sun, 9 May 2010, Deepesh D wrote:

> The AGI does some database lookups and based on the results sets some 
> dialplan variables. In the dialplan the call is routed to different 
> extensions based on the value of these variables. The database I use is 
> postgresql. The AGI uses libpq++ (postgresql's C++ interface) to connect 
> with database.

I see no benefit to implementing this as a module.

Implementing your AGI as FastAGI would eliminate process creation and 
database connection overhead.

I suspect a minor improvement in database design, indexing, etc. could 
yield orders of magnitude more improvement in performance than converting 
from AGI to FastAGI.

How many calls per second are you handling? I have a host (Intel(R) 
Xeon(TM) CPU 3.40GHz) handling 60,000 calls per day -- just under 1 call 
per second.

Each call executes 4 AGIs, each accessing the database, before the caller 
hears first audio. Each call may execute dozens of other AGIs through the 
life of the call.

If I were to do it again, I would merge the 4 AGIs into a single AGI and 
would consider FastAGI, but I have no performance problems at this CPS 
level.

I'm not against FastAGI, I'm just saying it may not be the silver bullet 
you are looking for.

-- 
Thanks in advance,
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Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
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