Thanks for your answer.

Please note that I have set 3 connection strings in SQLOPS module for 3 Postgres databases. How many connections per database does Kamailio open? (knowing that children=12 and only one listening interface).

Regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.com Sent: Tuesday, September 1, 2020 1:18 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org; Ali Taher ataher@vanrise.com Subject: Re: [SR-Users] worker processes

Hello,

note that other processes are created by kamailio, not only sip worker processes. For example, there will be timer processes.

The dedicated worker processes are only for UDP sockets, not for tcp/tls (here is a single pool of workers for all tcp/tls sockets). If you do not receive traffic on a specific udp socket, then do not listen to it, you have a group of processes not doing anything. If you need to listen on a socket, but have less traffic (e.g., used for monitoring), then use workers parameter before listen, so you get less worker processes for that udp socket.

Cheers, Daniel On 01.09.20 12:03, Ali Taher wrote: Hi,

I just want to ask regarding the children number and listening interfaces set in Kamailio configuration.

I am given to understand that the total number of worker processes there will be (children_setting * listeners) , so assuming I have set children=12 and listen=udp:172.16.1.12:5060 (which is the interface IP where the SIP packets as received), in this case there will be 12 worker processes and 12 database connections to postgresql (I'm using SQLOPS). My question is if I set listen=udp:0.0.0.0:5060 , knowing that I have 3 interfaces, in this case the number of worker processes will be 36. Is this good configuration ? will the other 24 processes be used or they are reserved to the 2 other interfaces which are not receiving any SIP packets and then will be useless ?

Regards, Ali Taher

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Hi Daniel,

I meant that I'm defining 3 connection strings using sqlcon parameter of sqlops module as shown below:

modparam("sqlops","sqlcon","cb=>postgres://postgres:kamailio@localhost:5432/cataleya") modparam("sqlops","sqlcon","mi=>postgres://postgres:kamailio@localhost:5432/cataleya_mitto") modparam("sqlops","sqlcon","sp=>postgres://postgres:kamailio@localhost:5432/cataleya_spactron")

regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.com Sent: Tuesday, September 1, 2020 1:52 PM To: Ali Taher ataher@vanrise.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: Re: [SR-Users] worker processes

hello,

what do you mean by "3 connection strings"? Maybe you can give similar example here.

Cheers, Daniel On 01.09.20 12:33, Ali Taher wrote: Thanks for your answer.

Please note that I have set 3 connection strings in SQLOPS module for 3 Postgres databases. How many connections per database does Kamailio open? (knowing that children=12 and only one listening interface).

Regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.commailto:miconda@gmail.com Sent: Tuesday, September 1, 2020 1:18 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org; Ali Taher ataher@vanrise.commailto:ataher@vanrise.com Subject: Re: [SR-Users] worker processes

Hello,

note that other processes are created by kamailio, not only sip worker processes. For example, there will be timer processes.

The dedicated worker processes are only for UDP sockets, not for tcp/tls (here is a single pool of workers for all tcp/tls sockets). If you do not receive traffic on a specific udp socket, then do not listen to it, you have a group of processes not doing anything. If you need to listen on a socket, but have less traffic (e.g., used for monitoring), then use workers parameter before listen, so you get less worker processes for that udp socket.

Cheers, Daniel On 01.09.20 12:03, Ali Taher wrote: Hi,

I just want to ask regarding the children number and listening interfaces set in Kamailio configuration.

I am given to understand that the total number of worker processes there will be (children_setting * listeners) , so assuming I have set children=12 and listen=udp:172.16.1.12:5060 (which is the interface IP where the SIP packets as received), in this case there will be 12 worker processes and 12 database connections to postgresql (I'm using SQLOPS). My question is if I set listen=udp:0.0.0.0:5060 , knowing that I have 3 interfaces, in this case the number of worker processes will be 36. Is this good configuration ? will the other 24 processes be used or they are reserved to the 2 other interfaces which are not receiving any SIP packets and then will be useless ?

Regards, Ali Taher

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www.twitter.com/micondahttp://www.twitter.com/miconda -- www.linkedin.com/in/micondahttp://www.linkedin.com/in/miconda

Funding: https://www.paypal.me/dcmierla

--

Daniel-Constantin Mierla -- www.asipto.comhttp://www.asipto.com

www.twitter.com/micondahttp://www.twitter.com/miconda -- www.linkedin.com/in/micondahttp://www.linkedin.com/in/miconda

Funding: https://www.paypal.me/dcmierla

Hi Daniel,

So in my case :

* Server vcpus = 24 * Max_worker_processes in postgres = 24 * Max_parallel_workers in postgres = 24 * Children in Kamailio config = 12 * 1 udp listener

I noticed that there is 48 database connections established by Kamailio (16 x 3) , can this cause an issue knowing that maximum worker processes is 24 ?

Regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.com Sent: Tuesday, September 1, 2020 6:48 PM To: Ali Taher ataher@vanrise.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: Re: [SR-Users] worker processes

Hello,

in this case there are 3 distinct connections per process, so you have to multiply the number of processes by 3 to get the overall number of connections. You can run 'kamctl ps' to see all the processes of a kamailio instance.

Actually a few kamailio processes may not open database connections, a matter of their purpose if they are created by specific modules, but for a rough upper limit, this is the formula.

Cheers, Daniel On 01.09.20 16:25, Ali Taher wrote: Hi Daniel,

I meant that I'm defining 3 connection strings using sqlcon parameter of sqlops module as shown below:

modparam("sqlops","sqlcon","cb=>postgres://postgres:kamailio@localhost:5432/cataleya") modparam("sqlops","sqlcon","mi=>postgres://postgres:kamailio@localhost:5432/cataleya_mitto") modparam("sqlops","sqlcon","sp=>postgres://postgres:kamailio@localhost:5432/cataleya_spactron")

regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.commailto:miconda@gmail.com Sent: Tuesday, September 1, 2020 1:52 PM To: Ali Taher ataher@vanrise.commailto:ataher@vanrise.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org Subject: Re: [SR-Users] worker processes

hello,

what do you mean by "3 connection strings"? Maybe you can give similar example here.

Cheers, Daniel On 01.09.20 12:33, Ali Taher wrote: Thanks for your answer.

Please note that I have set 3 connection strings in SQLOPS module for 3 Postgres databases. How many connections per database does Kamailio open? (knowing that children=12 and only one listening interface).

Regards, Ali Taher

From: Daniel-Constantin Mierla miconda@gmail.commailto:miconda@gmail.com Sent: Tuesday, September 1, 2020 1:18 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org; Ali Taher ataher@vanrise.commailto:ataher@vanrise.com Subject: Re: [SR-Users] worker processes

Hello,

note that other processes are created by kamailio, not only sip worker processes. For example, there will be timer processes.

The dedicated worker processes are only for UDP sockets, not for tcp/tls (here is a single pool of workers for all tcp/tls sockets). If you do not receive traffic on a specific udp socket, then do not listen to it, you have a group of processes not doing anything. If you need to listen on a socket, but have less traffic (e.g., used for monitoring), then use workers parameter before listen, so you get less worker processes for that udp socket.

Cheers, Daniel On 01.09.20 12:03, Ali Taher wrote: Hi,

I just want to ask regarding the children number and listening interfaces set in Kamailio configuration.

I am given to understand that the total number of worker processes there will be (children_setting * listeners) , so assuming I have set children=12 and listen=udp:172.16.1.12:5060 (which is the interface IP where the SIP packets as received), in this case there will be 12 worker processes and 12 database connections to postgresql (I'm using SQLOPS). My question is if I set listen=udp:0.0.0.0:5060 , knowing that I have 3 interfaces, in this case the number of worker processes will be 36. Is this good configuration ? will the other 24 processes be used or they are reserved to the 2 other interfaces which are not receiving any SIP packets and then will be useless ?

Regards, Ali Taher

_______________________________________________

Kamailio (SER) - Users Mailing List

sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org

https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

--

Daniel-Constantin Mierla -- www.asipto.comhttp://www.asipto.com

www.twitter.com/micondahttp://www.twitter.com/miconda -- www.linkedin.com/in/micondahttp://www.linkedin.com/in/miconda

Funding: https://www.paypal.me/dcmierla

--

Daniel-Constantin Mierla -- www.asipto.comhttp://www.asipto.com

www.twitter.com/micondahttp://www.twitter.com/miconda -- www.linkedin.com/in/micondahttp://www.linkedin.com/in/miconda

Funding: https://www.paypal.me/dcmierla

--

Daniel-Constantin Mierla -- www.asipto.comhttp://www.asipto.com

www.twitter.com/micondahttp://www.twitter.com/miconda -- www.linkedin.com/in/micondahttp://www.linkedin.com/in/miconda

Funding: https://www.paypal.me/dcmierla

Hi Alex,

That is clear. I decreased the max worker processes to 20 to be on the safe side. But what is confusing me is what about the 18 worker processes ran by Kamailio, will they overlap with postgres processes or they are the same , knowing that Kamailio role in my case is just getting routing decision by running a query on the database and send it back to the SBC. Excuse my lack of knowledge in how linux processes work.

Regards, Ali Taher

-----Original Message----- From: sr-users sr-users-bounces@lists.kamailio.org On Behalf Of Alex Balashov Sent: Tuesday, September 1, 2020 8:22 PM To: sr-users@lists.kamailio.org Subject: Re: [SR-Users] worker processes

On 2020-09-01 12:08, Ali Taher wrote:

I noticed that there is 48 database connections established by Kamailio (16 x 3) , can this cause an issue knowing that maximum worker processes is 24 ?

Postgres's ability to serve clients and accommodate queries isn't limited by the number of max_worker_processes. The default is 8 if this value is unset, yet any stock PostgreSQL instance can accommodate more than 8 concurrent connections, clearly. max_worker_processes != max_connections.

As far as the wisdom of setting process limits to equal the number of available CPU cores ("VCPUs"), there's no absolute answer to that. The general danger with doing this is just that a particularly expensive or destructive statement can consume all of the hardware resources, with no safety margins for other processes, and perhaps not even enough for someone to log in and resolve the problem. So, the general recommendation is not allow PostgreSQL to consume every single VCPU or max out any other resource, and that's why most Linux distributions' server packages come with these types of settings conservatively tuned.

-- Alex

-- Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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