[Freeswitch-users] high load with ~200 fax calls despite low CPU utilization and low IO wait

[Anthony Minessale]

Do not touch cent 6 with a 20 foot pole.   Something is seriously wrong
with it.  We have not figured it out yet.
On Aug 10, 2012 11:42 AM, "Adam Johnston" <ajohnston at blimessaging.com>
wrote:

> The 200 faxes are sending, they attempt T.38 but fallback to audio so it's
> a mix of both.
>
> If I log into a FreeSWITCH VM and launch 200 faxes from a script I don't
> see nearly the same level of CPU load, so I'm inclined to think it has
> something to do with the (many) event socket connections between my
> controller application and the VMs. I'm setting up a hardware FreeSWITCH
> server and writing a test harness to prove this out.
>
> Thanks,
> Adam
>
>
> On Fri, Aug 10, 2012 at 11:53 AM, Steve Underwood <steveu at coppice.org>wrote:
>
>> On 08/10/2012 04:55 AM, Adam Johnston wrote:
>> > Hi all,
>> >
>> > My FreeSWITCH setup works as follow: I have a service that launches
>> > and monitors faxes (via event sockets) on one of a few FreeSWITCH
>> > instances. These FreeSWITCH instances are running on dual-core, 2ghz
>> > CentOS 5.8 and CentOS 6.0 VMs. The issue is that once I get to ~200
>> > simultaneous faxes on any one FreeSWITCH VM the load average shoots up
>> > (typically ~30, although I've seen it get much higher) and the VM
>> > becomes sluggish and occasionally unusable.
>> >
>> > top and sar output confirms that CPU utilization is pretty low, as are
>> > IO wait and RAM usage.
>> >
>> > I'm using a git head from 2012-02-06, although I see the same problem
>> > if update to a more current head. On the most recent head I tried
>> > (2012-08-06) the issue is worse, and crashes with a backtrace similar
>> > to this Jira, http://jira.freeswitch.org/browse/FS-2893 despite my
>> > compiling Lua and including the FreeSWITCH bindings.
>> >
>> > These issues occur on both the CentOS 5.8 and 6.0 VMs. I'm in the
>> > process of loading 5.8 onto a physical machine and testing there. It's
>> > also worth nothing that this load issue does not occur when I launch
>> > faxes from a script on one of the VMs.
>> >
>> > Has anyone else seen similar high load issues before?
>> >
>> > Many thanks,
>> > Adam Johnston
>> >
>> What are these 200 FAXes doing? sending or receiving? Using audio or
>> T.38? It makes quite a different to the load. Sending 200 faxes by audio
>> at 14,400bps will keep a dual core machine busy. I'm not sure you can
>> trust the CPU utilisation figures in a VM environment.
>>
>> Steve
>>
>>
>> _________________________________________________________________________
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>>
>> 
>> 
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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
>
> Join Us At ClueCon - Aug 7-9, 2012
>
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