[Freeswitch-users] FreeSWITCH changing max_sessions automatically

Sat Mar 29 12:09:11 MSK 2014

Take  a look in your FS logs..
Im pretty sure you will see the whimsical & Awesome log message :

*LUKE: I'm hit, but not bad.LUKE'S VOICE: Artoo, see what you can do with
it. Hang on back there....*
this is in thread_launch_failure in switch_core_session.c ( around line
1714 )
and around this code you can easily see the following

sess_count = switch_core_session_count();
if (sess_count > 110) {
switch_core_session_limit(sess_count - 10);
as you can see, it bumps 10 off your SPS, every time thread_launch_failure
is called.

thread_launch_failure is called whenever switch_thread_create fails to
create a thread.
which basically means apr_thread_create

I have seen this myself with MUCH lower SPS on openVZ machines, but since
your seeing it also im now hoping we can nut this out :)
im going to dig a little more and see what I can find.

what openVZ kernel are you using out of interest ?
ive seen this on a fairly old, but stable 2.6.32-19-pve

let me know what you find !

On 28 March 2014 04:30, Muhammad Naseer Bhatti <nbhatti at gmail.com> wrote:

> Yes, i was thinking on same lines. Its running over OpenVZ kernel.
> I am now going to try replicate this in a physical env.
>
> Sent from my iPad
>
> > On Mar 27, 2014, at 9:11 PM, William King <william.king at quentustech.com>
> wrote:
> >
> > Is your FS instance running in a virtual environment?
> >
> > William King
> > Senior Engineer
> > Quentus Technologies, INC
> > 1037 NE 65th St Suite 273
> > Seattle, WA 98115
> > Main:   (877) 211-9337
> > Office: (206) 388-4772
> > Cell:   (253) 686-5518
> > william.king at quentustech.com
> >
> >> On 03/27/2014 11:07 AM, Muhammad Naseer Bhatti wrote:
> >> No i am definitely not going to that SPS limit. The peak was set to 400
> >> so maybe this is just a skewed value. 1000 session does not look to be
> >> high load. The call is bridged and set to play silence and disconnects
> >> at random time under 1 minute.  The resources on the server also clearly
> >> seem to be available. I am not gearing this towards a how do i ....
> >> Performance kind of a thread but could there be something unusual here?
> >>
> >> Sent from my iPad
> >>
> >> On Mar 27, 2014, at 9:07 PM, Ken Rice <krice at freeswitch.org
> >> <mailto:krice at freeswitch.org>> wrote:
> >>
> >>> Re: [Freeswitch-users] FreeSWITCH changing max_sessions automatically
> >>> You're hitting a melt down protection... Once it reaches a limit and
> >>> cant allocate the additional resources for creating anew session it
> >>> will back down the max sessions limit to help save itself...
> >>>
> >>> The PEAK SPS there was a value seen at some point the SPS buffer...
> >>> Depending on you beating the machine to death it is possible that
> >>> number got skewed due to a timer miss
> >>>
> >>>
> >>> On 3/27/14 10:57 AM, "Muhammad Bhatti" <nbhatti at gmail.com> wrote:
> >>>
> >>>
> >>>    Just have noticed something new today. Testing a local instance on
> >>>    CentOS 6.0 with FreeSWITCH Version 1.2.23~64bit. FreeSWITCH seems
> >>>    to be changing the max_sessions param automatically. This happens
> >>>    when typically I bridge around 1000 sessions and whatever value I
> >>>    set to sps and max_sessions, it comes down.
> >>>
> >>>    UP 0 years, 0 days, 0 hours, 37 minutes, 54 seconds, 362
> >>>    milliseconds, 294 microseconds
> >>>    FreeSWITCH (Version 1.2.23  64bit) is ready
> >>>    74716 session(s) since startup
> >>>     *976 session(s) - peak 1022, last 5min 985
> >>>    112 session(s) per Sec out of max 400, peak 9053, last 5min 317 <-
> >>>    BTW This peak was never tried, not sure why it says 9053
> >>>     5000 session(s) max
> >>>    min idle cpu 0.00/55.00
> >>>    Current Stack Size/Max 240K/8192K
> >>>
> >>>    =======
> >>>    followed by
> >>>    =======
> >>>
> >>>    switch_core_session.c:2288 Over Session Limit! 1013
> >>>    mod_sofia.c:4884 Error Creating Session
> >>>
> >>>    =======
> >>>    And then
> >>>    =======
> >>>
> >>>    freeswitch at internal> status
> >>>    UP 0 years, 0 days, 0 hours, 38 minutes, 35 seconds, 372
> >>>    milliseconds, 831 microseconds
> >>>    FreeSWITCH (Version 1.2.23  64bit) is ready
> >>>    76231 session(s) since startup
> >>>     560 session(s) - peak 1023, last 5min 1023
> >>>    0 session(s) per Sec out of max 400, peak 9053, last 5min 317
> >>>     1013 session(s) max
> >>>    min idle cpu 0.00/99.00
> >>>    Current Stack Size/Max 240K/8192K
> >>>
> >>>
> >>>    Is this something changed recently? Or some sort of server
> >>>    meltdown protection mechanism being forked :)
> >>>
> >>>
> >>>    *
> >>>
> >>> *
> >>> *--
> >>> Ken
> >>> _http://www.FreeSWITCH.org
> >>> http://www.ClueCon.com
> >>> http://www.OSTAG.org
> >>> _irc.freenode.net <http://irc.freenode.net> #freeswitch
> >>> Twitter: @FreeSWITCH
> >>>
> >>>
> _________________________________________________________________________
> >>> Professional FreeSWITCH Consulting Services:
> >>> consulting at freeswitch.org <mailto:consulting at freeswitch.org>
> >>> http://www.freeswitchsolutions.com
> >>>
> >>> 
> >>> 
> >>>
> >>> Official FreeSWITCH Sites
> >>> http://www.freeswitch.org
> >>> http://wiki.freeswitch.org
> >>> http://www.cluecon.com
> >>>
> >>> FreeSWITCH-users mailing list
> >>> FreeSWITCH-users at lists.freeswitch.org
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> >>
> >>
> >>
> _________________________________________________________________________
> >> Professional FreeSWITCH Consulting Services:
> >> consulting at freeswitch.org
> >> http://www.freeswitchsolutions.com
> >>
> >> 
> >> 
> >>
> >> Official FreeSWITCH Sites
> >> http://www.freeswitch.org
> >> http://wiki.freeswitch.org
> >> http://www.cluecon.com
> >>
> >> FreeSWITCH-users mailing list
> >> FreeSWITCH-users at lists.freeswitch.org
> >> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >> UNSUBSCRIBE:
> http://lists.freeswitch.org/mailman/options/freeswitch-users
> >> http://www.freeswitch.org
> >>
> >
> > _________________________________________________________________________
> > Professional FreeSWITCH Consulting Services:
> > consulting at freeswitch.org
> > http://www.freeswitchsolutions.com
> >
> > 
> > 
> >
> > Official FreeSWITCH Sites
> > http://www.freeswitch.org
> > http://wiki.freeswitch.org
> > http://www.cluecon.com
> >
> > FreeSWITCH-users mailing list
> > FreeSWITCH-users at lists.freeswitch.org
> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> > http://www.freeswitch.org
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
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>

-- 
Sincerely

Jay
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