[SR-Users] Seeing Large Waits

[Alex Balashov]

Hi Mack,

What sort of end-to-end delays are you seeing, from receipt of request
until immediately before t_relay()?

You can profile this with the benchmark module:

   https://kamailio.org/docs/modules/5.1.x/modules/benchmark.html

Or my preferred method, the hard way:

        # At the practical start of request processing.

        $avp(proc_start) = $TV(Sn);

        # At the end, right before calling t_relay() or forward().

        $var(cur_time) = $TV(Sn);

        $var(proc_diff) = (
                (((
                  $(var(cur_time){s.select,0,.}{s.int}) -
                  $(avp(proc_start){s.select,0,.}{s.int})
                ) * 1000000)
                +
                (
                 $(var(cur_time){s.select,1,.}{s.int}) -
                 $(avp(proc_start){s.select,1,.}{s.int})
                ) / 1000) mod 1000
        );

        xlog("L_INFO", "[R-MAIN:$ci] -> Request processing delay: $var(proc_diff) ms\n"););

Also, for general background on this topic, you might consider my
article on the subject of Kamailio performance characteristics:

   http://blog.csrpswitch.com/tuning-kamailio-for-high-throughput-and-performance/

If I had to guess, shooting from the hip, you've got some really slow
database queries somewhere.

-- Alex

On Wed, May 02, 2018 at 06:19:00PM -0400, Mack Hendricks wrote:

> Hey All,
> 
> We are load testing Kamailio 4.2.3 and we are seeing the waiting within the transaction manager increasing.   I’ve increased the children from 8 to 16 to 24, but we are still seeing a large amount of waiting.  I don’t see an errors in the logs.   Can anyone give me a clue on where to look. 
> 
> 05-02-18_03:07:38 PM
> tm.stats
> {
>         current: 390
>         waiting: 226
>         total: 2361
>         total_local: 0
>         replied_locally: 1406
>         6xx: 0
>         5xx: 0
>         4xx: 88
>         3xx: 0
>         2xx: 3180
>         created: 2361
>         freed: 1971
>         delayed_free: 0
> }
> 
> Mack Hendricks / Head of Support / dOpenSource
> web: http://dopensource.com <http://dopensource.com/>
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-- 
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/