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asterisk.org at sedwar...
Guest
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 Posted: Thu Apr 17, 2014 4:41 pm Post subject: [asterisk-users] Dimensioning |
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On Thu, 17 Apr 2014, Jerry Geis wrote:
| Quote: | I was thinking transcoding was through PRI card - not gsm to ulaw. 
|
You can convert the GSM files to ULAW using sox. I tend to transcode
everything to WAV (PCM not that funky 'GSM in WAV') because it is
relatively cheap (CPU cycles) to transcode from WAV to ULAW and everything
else in the world understands WAV just fine. If you really need to squeeze
out every last cycle, you can schedule a script to transcode WAVs to ULAWs
as needed.
| Quote: | So if all I am doing is originating calls, and using playback() in the
dialplan - then a system() call on completion I can expect upwards or
3000 concurrent calls?
|
Based on my unsubstantiated testing on my hosts, that seems like a
reasonable conclusion.
What do you do in the program executed by system()?
| Quote: | How do you actually test to make sure without having 3000 users to call.
|
Crowdsourcing?
No, it's really pretty simple.
On the 'source' host, I have a call file:
# sample-call-file
channel:sip/test@target
application:playback
data:/tmp/total
# (end of sample-call-file)
And a shell script to create the call files:
# create-calls.sh
cp sample-call-file /tmp/
chmod +x /tmp/sample-call-file
for I in $(seq 1 $1)
do
sudo -u asterisk\
cp /tmp/sample-call-file\
/var/spool/asterisk/outgoing/${RANDOM}
done
# (end of create-calls.sh)
Then, on the 'target' host I have a dialplan snippet:
[public]
exten = test,1, verbose(1,[${EXTEN}@${CONTEXT}])
exten = test,n, set(GROUP()=TEST)
exten = test,n, set(ROOM=0${GROUP_COUNT()})
exten = test,n, meetme(${ROOM:-2}, cd)
; exten = test,n, confbridge(${ROOM:-2})
exten = test,n, hangup()
Then, on the 'source' host, I can create calls with this command:
./create-calls.sh <number-of-calls-to-create>
--
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
--
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jcolp at digium.com
Guest
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| Posted: Fri Apr 18, 2014 8:49 am Post subject: [asterisk-users] Dimensioning |
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|
Steve Edwards wrote:
| Quote: | On Thu, 17 Apr 2014, Jerry Geis wrote:
| Quote: | I was thinking transcoding was through PRI card - not gsm to ulaw.
|
You can convert the GSM files to ULAW using sox. I tend to transcode
everything to WAV (PCM not that funky 'GSM in WAV') because it is
relatively cheap (CPU cycles) to transcode from WAV to ULAW and
everything else in the world understands WAV just fine. If you really
need to squeeze out every last cycle, you can schedule a script to
transcode WAVs to ULAWs as needed.
| Quote: | So if all I am doing is originating calls, and using playback() in the
dialplan - then a system() call on completion I can expect upwards or
3000 concurrent calls?
|
Based on my unsubstantiated testing on my hosts, that seems like a
reasonable conclusion.
|
I'll just chime in slightly here. At that number of calls you've got
many factors going on - and they aren't just Asterisk. If playing back
files you've got disk I/O going on which can slow stuff down (unless the
system caches it enough or you throw them into a ramdisk yourself). You
are also sending and receiving a *ton* of small packets. This can make
network equipment and NICs unhappy.
Cheers,
--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
http://www.asterisk.org/hello
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
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