[Freeswitch-users] High CPU usage with only 30 channels?

Ken Rice krice at freeswitch.org
Mon Feb 13 19:57:49 MSK 2012 

Also keep in mind that since FS is highly threaded its designed to take
advantage of more cores... ie: a 8 core 2.3ghz box should easily out perform
a 2core 3ghz box... This isnt the case with all software... Most software
due to legacy coding restrictions more cores help a fair bit, but not as
much as increasing clock speeds due certain parts of the software requiring
single threaded (or atleast 1 thread at a time) accessing key linked lists
which drags down over all system performance....

K

On 2/13/12 10:52 AM, "Tim St. Pierre" <fs-list at communicatefreely.net> wrote:

> Thanks Ken,
> 
> I did wonder if it was due to the thread count.  If I can safely ignore
> it, then maybe I shouldn't worry until the CPU usage is higher.  We had
> some spotty service earlier this week that got me scared - phones taking
> a long time to respond, etc.  I think that was on account of the
> database being choked though.
> 
> Thanks!
> 
> -Tim
> 
> Ken Rice wrote:
>> How is that working hard? That thing is only using about 4% of the cpu
>> 
>> Most programs arent as heavily threaded as FS so the load avg never really
>> gets that high... You can safely ignore it... The real thing to pay
>> attention to is how much idle time you have on the cpu... And w0w its 93.6%
>> on both cores.... That should tell you something
>> 
>> 
>> On 2/13/12 10:32 AM, "Tim St. Pierre" <fs-list at communicatefreely.net> wrote:
>> 
>>   
>>> Hello,
>>> 
>>> I'm having some scaling problems with our Freeswitch system.  The
>>> machine running Freeswitch seems to be working very hard during the day,
>>> and we don't have that big a load.  I need to be able to double our
>>> subscriber base, and I don't really want to go to a cluster just yet.
>>> Here's what top -CP displays during busy hour:
>>> 
>>> tim at stefan%top -PC
>>> last pid: 75968;  load averages:  4.64,  2.92,
>>> 1.74           
>>> up 10+08:54:14  11:17:25
>>> 129 processes: 1 running, 128 sleeping
>>> CPU 0:  4.5% user,  0.0% nice,  1.9% system,  0.0% interrupt, 93.6% idle
>>> CPU 1:  3.8% user,  0.0% nice,  2.6% system,  0.0% interrupt, 93.6% idle
>>> Mem: 632M Active, 2093M Inact, 322M Wired, 83M Cache, 384M Buf, 785M Free
>>> Swap: 4096M Total, 36K Used, 4096M Free
>>> 
>>>   PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    CPU COMMAND
>>> 58521 freeswitch   98  74  r30   749M   648M ucond   0 528:54  0.10%
>>> freeswitch
>>>   983 root          1  44    0 10824K  2272K select  1   0:40  0.00% ntpd
>>> 
>>> As you can see, the load average is pretty high, at least for something
>>> not that big.  FS often has up to about 110 threads going.  At night,
>>> this will settle right down to a 0.05 load average.  CPU load never gets
>>> that high, but the machine still seems busy.
>>> 
>>> Here's some other details:
>>> 
>>> 40 channels, nearly all of them in CS_EXECUTE or CS_EXCHANGE_MEDIA  We
>>> see only a few CPS, maybe 10 if it's really busy, but most calls are
>>> longer.  Nearly all our customers are regular office users.
>>> 
>>> There are 340 phones registered.  About 300 of those are behind NAT
>>> getting an options-ping every 30s.  They re-register every 5 minutes, so
>>> we see around 1 registration attempt per second, although it can be a
>>> little bursty.
>>> 
>>> Each phone has at least 5 BLF subscriptions,   There are 1156 rows in
>>> the sip_subscriptions table.
>>> 
>>> All our trunks are SIP.  Trunk side is g.711u and endpoints can do
>>> either g.711u or g.722
>>> 
>>> We use ODBC in the core - as well as for sofia, voicemail, and anything
>>> else that can use it.  Directory and dialplan are done using CURL and
>>> handled by another server.  The database is also on another server.
>>> 
>>> Our MySQL system sits at about 100 Queries per second during the day ,
>>> down to about 80 qps at night.  This system started to choke until I
>>> changed a lot of the tables to the MEMORY engine and installed SSDs as
>>> the primary storage devices.  Now the database is pretty happy - about
>>> 0.5 load average at the moment.  It was up to 2 with 60% CPU going to
>>> mysqld before I went to memory tables.
>>> 
>>> I keep hearing about FS systems handling thousands of users on one box.
>>> I'm nowhere near that and it seems to be maxed out.
>>> 
>>> This system  has a dual core Xeon 5100 at 2.6 GHz and 4GB of ram.
>>> Memory doesn't seem to be the issue, as there is still some unused.
>>> Operating system is FreeBSD 8.0-RELEASE (amd64)  Freeswitch is Version
>>> 1.0.head (git-7531fed 2011-08-17 11-27-20 -0500)  I'm trying to update,
>>> but newer version break functionality, so I have to find a release that
>>> work before I can upgrade.
>>> 
>>> What should  I look for to remedy this, or is this considered normal and
>>> I just need more power?  I could easily upgrade this box and install a
>>> pair of quad core chips.
>>> 
>>> Any other information that would be helpful?
>>> 
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>> 
>>> 
>>> 
>>> 
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>>>     
>> 
>> 
>> 
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>> 
>> 
>> 
>> 
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>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>> 
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>>   
> 
> 
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
> 
> 
> 
> 
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> 
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