[SR-Users] Understanding some usrloc modparams

[Daniel-Constantin Mierla]

Hello,

the workload is split between the processes created due to param
timer_procs>1. If timer_procs=0, is the primary timer that takes care of
checking for and cleaning expired records.

If timer_procs=1, then a dedicated timer process is created by usrloc
and this timer process is doing the cleanup job for all location
records. If timer_procs>1, then the workload is split among those
processes, each process gets assigned a list of slots from the internal
hash table storing the location records and they do cleanup on those slots.

Cheers,
Daniel

On 20.02.20 08:50, Alex Balashov wrote:
> Thanks, Henning.
>
> But I thought Joel’s question about multiple processes was
> interesting. Is the workload somehow split up among them? If not, why
> have multiple ones?
>
> —
> Sent from my iPad
>
>> On Feb 20, 2020, at 2:00 AM, Henning Westerholt <hw at skalatan.de> wrote:
>>
>> 
>>
>> Hi Joel,
>>
>>  
>>
>> $ root at proxy-1:~# kamcmd ps |grep second
>>
>> 31314   secondary timer
>>
>>  
>>
>> Basically it makes sense to use a dedicated timer if you have a large
>> DB and/or a DB which is not particularly fast for the expiration, to
>> not block the core timer to long.
>>
>>  
>>
>> Cheers,
>>
>>  
>>
>> Henning
>>
>>  
>>
>> -- 
>>
>> Henning Westerholt – https://skalatan.de/blog/
>>
>> Kamailio services – https://gilawa.com <https://gilawa.com/>
>>
>>  
>>
>> *From:* sr-users <sr-users-bounces at lists.kamailio.org> *On Behalf Of
>> *Joel Serrano
>> *Sent:* Thursday, February 20, 2020 1:12 AM
>> *To:* Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
>> *Subject:* [SR-Users] Understanding some usrloc modparams
>>
>>  
>>
>> Hello,
>>
>>  
>>
>> I have an installation using usrloc + db_mode=1.
>>
>>  
>>
>> If I want on db_mode=1 or db_mode=2 the expired contacts to be
>> cleaned up I have to enable the modparam db_timer_clean:
>>
>>  
>>
>> https://www.kamailio.org/docs/modules/devel/modules/usrloc.html#usrloc.p.db_timer_clean
>>
>>  
>>
>> The docs say:
>>
>>  
>>
>> "/Enable (1) or disable (0) cleaning of expired db records on timer
>> basis for db_mode WRITE-BACK and WRITE-THROUGH. It uses the secondary
>> timer process./"
>>
>>  
>>
>> I have the following doubts:
>>
>>  
>>
>> 1- What does the reference "it uses */the/* secondary timer process"
>> mean? Is there a specific secondary timer just for this purpose?
>>
>> 2- Is  #1 related to the modparam timer_procs? (so it uses one of
>> those when enabled?)
>>
>> 3- Why/When would you need a timer_proces modparam with a value
>> higher than "1"? 
>>
>>  
>>
>>  
>>
>> Thanks, 
>>
>> Joel.
>>
>>  
>>
>>  
>>
>> _______________________________________________
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>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - March 9-11, 2020, Berlin - www.asipto.com
Kamailio World Conference - April 27-29, 2020, in Berlin -- www.kamailioworld.com

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