I would say the first step is to gauge the total velocity of any given initial request through your config.
One way to do that is:
https://kamailio.org/docs/modules/5.2.x/modules/benchmark.html
But I prefer this approach:
route { $avp(proc_start) = $TV(Sn);
...
if(is_method("INVITE")) { processing_etc();
$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}) - $(avp(proc_start){s.select,1,.}{s.int}) ) / 1000) mod 1000 );
xlog("L_INFO", "[$ci] Request processing delay: $var(proc_diff) ms\n");
if(!t_relay()) sl_reply_error();
exit; } }
I don't vouch for the precision/granularity of this timing scheme, but it's good enough that it should tell you if your total request processing volume is insane. Then you can move these breakpoints around until you find which operation is actually so slow.
That said, I am not aware of any aspect by which Kamailio intrinsically sends a 503 if it is overwhelmed with requests. It just drops them/doesn't process.
-- Alex
On Wed, Feb 27, 2019 at 06:35:46PM +0000, Duarte Rocha wrote:
Ok, i reduced the number of processes and tried a few different values, but the performance hasn't changed a lot.
How can i debug this and find the bottleneck in my system?
A quarta, 27/02/2019, 17:56, Duarte Rocha duarterocha91@gmail.com escreveu:
Greetings Alex,
At the moment i'm trying to debug some issues with the server and try some solutions to see the impact. With little load i'm getting some percentage of "503 Server Unavaliable" errors from Kamailio. I made some testing without using database for anything but Dispatcher and Accounting and the performance got way better.
Right now, on this server, under as little as 20CPS Kamailio is returning "503" on 1-2% of all calls. However, my CPU and Memory look like this:
%Cpu(s): 20.3 us, 6.1 sy, 0.0 ni, 73.3 id, 0.0 wa, 0.0 hi, 0.2 si, 0.2 st
Memory :
total used free shared buff/cache availableMem: 1830 1172 382 109 274 375 Swap: 819 49 770
I have around 100 processes for Kamailio.
Cheers
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