[Kamailio-Users] ERROR:mysql:db_mysql_new_connection: driver error: Too many connections

[Ovidiu Sas]

Increasing the number of children to 200 will not help.
Most likely, your config is doing something 'wrong' or being terribly
intensive on mysql db.
Openser is very light and it can handle lot's of transaction, but if
you are using a slow db and you are doing db queries during your
transaction processing, then your server will be slow.

Check your config and see what's going 'wrong' there.

As a reference, openser is able to do 150 cps using a single child and
the CPU is barely utilized (on a slow machine).


Regards,
Ovidiu Sas

On Wed, Sep 3, 2008 at 10:31 AM, Samael - <samael.zgz at gmail.com> wrote:
> Hi,
>
>
>
> We are deploying OpenSER in a large infrastructure together with Asterisk to
> support thousands of current transactions.
>
> We are using udp listener and mysql module in openser.
>
>
>
> We had to increase the children parameter of the openser.cfg to 200 because
> Openser couldn't handle the high amount of concurrent SIP REQUESTs from
> ASTERISK (Not only INVITES, but also a lot of SIP OPTIONs), that means that
> Openser couldn't handle more than 'children' REQUEST loosing the rest of the
> concurrent REQUEST.
>
> children=200
>
>
>
> But then, the following error appeared in the openser:
>
> ERROR:mysql:db_mysql_new_connection: driver error: Too many connections
>
>
>
> This is because the Standard parameter of mysql "max_connections" is set to
> 100.
>
>
>
> In mysql CLI, we can see that every child process of openser has a mysql
> connection. (see in Mysql> SHOW PROCESSLIST)
>
>
>
> The recommended max_connections parameter is 500-1000 => we have a limit of
> 500-1000 concurrent SIP REQUEST to be processed by the openser.
>
>
>
> Why there is a process for every child?
>
>
>
> Why is neccesary a mysql connection for every child?
>
> Can the openser have a pool of mysql connection to be used by thousands of
> children?
>
> Regards
>
> _______________________________________________
> Users mailing list
> Users at lists.kamailio.org
> http://lists.kamailio.org/cgi-bin/mailman/listinfo/users
>
>