[OpenSIPS-Users] Opensips Dispatcher and PVAR pattern for load-balancing.

Răzvan Crainea razvan at opensips.org
Wed Dec 23 14:54:01 CET 2015

Hi, Dhaval!

A use case for this algorithm is setting the pv_algo_pattern as shown in 
the documentation page[1]:
modparam("dispatcher", "pvar_algo_pattern", "$stat(load_%u)")

This parameter indicates that whenever you are using a ds_select_*() 
function with algorithm 9, OpenSIPS will check the load for each 
destination, and order them based on each value.
For example, consider we have two destinations: sip: and 
sip: Algorithm 9 will evaluate for each destination the 
following pvars:
$stat(load_sip: and $stat(load_sip: and order them based 
on its values. Then of course, first picks the least used one.

All that's left for you is to update the statistic accordingly. For example:

if (ds_select_dst("0", "9"))
     update_stat("load_sip:$dd", "+1");

Hope that's clear now.

[1] http://www.opensips.org/html/docs/modules/2.1.x/dispatcher#id293975

Best regards,

Răzvan Crainea
OpenSIPS Solutions

On 12/18/2015 01:05 PM, DHAVAL INDRODIYA wrote:
> Dear All,
> I am working on opensips dispatcher and found that dispatcher is able 
> to do loadbalancing in function ds_select_dst.
> I have found a good description on DISPATCHER module itself it says - 
> " *The /pvar_algo_pattern/ parameter is used to determine the load on 
> each server. If the parameter is not specified, then the first entry 
> in the set is chosen.*"
> Now the question here is how to use this load balancing and what 
> should be exact value we need to put in pvar_algo_pattern?
> How to define weight in table I mean what should be value of weight in 
> table it is like number of call handling capability?
> I have found some of the reference and that some how not working i 
> might be using in wrong way if any one have a good example then would 
> be a great help for me.
> ​BR,
> DI​
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
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