[Freeswitch-users] High CPU usage with only 30 channels?
Tim St. Pierre
fs-list at communicatefreely.net
Mon Feb 13 19:52:55 MSK 2012
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.
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:
>> 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,
>> 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%
>> 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
>> Official FreeSWITCH Sites
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> Official FreeSWITCH Sites
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
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