[Freeswitch-users] How many concurrent calls

[Muhammad Shahzad]

Hi Everyone,

Sorry i was out-station and extremely busy for last couple of weeks or so,
therefore, i couldn't reply earlier. Anyways, here is some data regarding
our testing of FreeSWITCH conducted at a NOC in Lahore, Pakistan,

Setup:
1. We setup two servers of same hardware i.e. *Fujitsu Siemens Xeon *3.2 GHz,
each running Gentoo Linux 2006.0 with kernels 2.6.15-r8 and
2.6.17-r5respectively.
2. These servers were then connected over cross-line cable to each other
using Gigabit NICs.
3. We installed Asterisk version 1.2.10 on machine 'A' and FreeSWITCH
snapshot dated 2006-09-01 on machine 'B'.
4. Each machine had another Gigabit NIC through which it was connect to
Internet, so that i can access them remotely.
5. I was connected to these servers over 100kbs CDMA wireless Internet link
via ssh.
6. Date was Sept. 02, 2006, 0300hours PKST (GMT+5 zone).

Test Plan I: (Simple Playback)
We generated batches of 100, 200, 300, 400 and 500 calls, with steps 25, 50,
100 calls dialed simultaneously at an interval of 10 seconds. Each call
plays a flat tone of one minute length, file format WAV, codec GSM.

Maximum concurrent calls should be,

  X   |  25          50          100  (steps)
------------------------------------------
100 | 100        100         100
200 | 150        200         200
300 | 150        250         300
400 | 150        250         400
500 | 150        250         500
(Test Matrix: Fixed interval of 10 seconds)

In this plan number of calls equal number of active IAX2 channels. Maximum
time for maxium concurrent calls was between 9 and 10 seconds.

Results:
All batches successfully executed, however at 400 or above concurrent calls
the load averge shoot to over 5.6 and FreeSWITCH console was showing call
details so fast that my remote ssh link hanged. When the link resumed the
FreeSWITCH was still up and number of calls were decreasing as the test was
moving towards end.

Test Plan II: (Forward Bridged Calls)
1. We generated same batches of calls except that now they dials out to
Machine A (the one running Asterisk). That machine accepts the call and
plays back a milliwatt for 1 minute, codec GSM.

2. Since calls were bridged so number of calls were half the number of
channels.

Results:
At 436 active channels (218 concurrent calls) Asterisk crashes and therefore
all calls dropped.

Test Plan III: (Reverse Bridged Calls)
1. Same as plan II, except now we generated calls from Machine A (i.e.
Asterisk) and Machine B (i.e. FreeSWITCH) answers the call and plays back
flat tone of 1 minute length (file format WAV, codec GSM)

2. Since calls were bridged so number of calls were half the number of
channels.

Results:
At 394 active channels (197 concurrent calls) FreeSWITCH crashes and
therefore all calls dropped.

Warning:
These tests may not exhibit same results in all environments, we did not
follow any specific testing standard nor we endorse any software or hardware
used in these tests.

I wanted to decrease the interval as well as call steps to get more exact
information on how and when FreeSWITCH and asterisk crashes but i had to
abandon further plans due to bad weather (i was using wireless link which
went down).

Now i am planing for FreeSWITCH to FreeSWITCH bridged calls testing, i will
send you the results whenever i got those servers available to me.

Thanks and best regards.

-shahzad


On 9/4/06, Brian West <brian.west at mac.com> wrote:
>
> Was this 500 bridged calls?  or 250 bridged calls? or 500 going to
> playback?
> /b
>
> On Sep 3, 2006, at 5:05 PM, Muhammad Shahzad wrote:
>
> Not sure, but i think that depends on your hardware. Freeswitch has no
> such built-in limitation on number of concurrent calls.
>
> We have tested it upto 500 concurrent IAX2 calls on an Intel Xeon 3.2 GHz
> machine with 2.0GB of RAM. :-)
>
> -shahzad.
>
>
> On 9/2/06, Kamran Ahmad <kamranah at gmail.com> wrote:
> >
> >  HI
> >
> > How many concurrent calls are supported by freeswitch on linux or
> > windows ? any idea?
> >
> > Thanks
> > Kamran
> >
> >
> >
> >
> >
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>
> --
> Muhammad Shahzad
> -------------------------------
> Manager Support,
> Convergence Business Systems,
> Lahore, Pakistan.
> Cell: 0092 334 422 40 88
> Email: shaheryarkh at googlemail.com
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-- 
Muhammad Shahzad
-------------------------------
Manager Support,
Convergence Business Systems,
Lahore, Pakistan.
Cell: 0092 334 422 40 88
Email: shaheryarkh at googlemail.com
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