[OpenSIPS-Users] High load average due to mi_datagram's sockets

[Andrei Dragus]

Hi Magnus,

The load average is the average length of the run-queue in the kernel 
scheduler. It can be fairly high and still have a low level of CPU-usage.

I've looked into the sources and it seems that sharing Unix sockets is 
implemented using some form of user-space synchronization (it uses 
spinlocks).

The problem is not in OpenSIPS but rather in the implementation of unix 
sockets. If this presents a problem, switch to udp sockets, or set the 
number of processes very low.


 */             /*



Bogdan-Andrei Iancu wrote:
> Hi Magnus,
>
> I was able to reproduce this behaviour on my machine ...but this happens 
> only with unixsocks and not with UDP socks.....
>
> Let me investigate and see what I will find about.
>
> Regards,
> Bogdan
>
> Magnus Burman wrote:
>   
>> I noticed a strange load average on my system. When the system was 
>> idle, I had a load of 4.00. It turns out that it's directly related to 
>> mi_datagram:s children_count. I had 5, and the load was 4. Lowering to 
>> 2 I got load 1.00, lowering to 1 I get 0.00, increasing to 20 I get 19.
>>
>> This is on an idle system (no calls), with nothing but a "regular" 
>> setup of Opensips + Mediaproxy (w/ radius and cdrtool).
>>
>> What could possible cause this?
>>
>> --
>>
>> modparam("mi_datagram", "socket_name", 
>> "/var/run/opensips/mi_datagram.sock")
>> modparam("mi_datagram", "children_count", 20)
>> modparam("mi_datagram", "unix_socket_mode", 0666) # same without this row
>> modparam("mi_datagram", "socket_timeout", 2000) # same without this row
>>
>> --
>>
>> top - 16:35:46 up 2 days, 20:19,  4 users,  load average: 19.00, 
>> 18.99, 18.22
>> Tasks: 141 total,   1 running, 140 sleeping,   0 stopped,   0 zombie
>> Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  
>> 0.0%si,  0.0%st
>> Mem:   3060736k total,  1198600k used,  1862136k free,   123576k buffers
>> Swap:  9896000k total,        0k used,  9896000k free,   559468k cached
>>
>> --
>>
>> Best Regards,
>> Magnus
>> ------------------------------------------------------------------------
>>
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>
>
>   

-- 
Andrei Dragus
www.voice-system.ro