16 Sep
2022
16 Sep
'22
5:54 a.m.
Hi Alex,
Can you share specifically where in the configs I would be able to confirm that
asynchronous logging is enabled?
I’ve already added the “-“ in front of the log file and that didn’t seem to make any
recognizable difference.
Thanks in advance.
Amit
From: sr-users <sr-users-bounces(a)lists.kamailio.org> on behalf of Alex Balashov
<abalashov(a)evaristesys.com>
Date: Thursday, September 15, 2022 at 5:21 PM
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Subject: Re: [SR-Users] Log levels severely impacts performance
Agree, have had some very high-volume systems with prodigious logging output for every
call and no problems.
Have also had these types of load problems on other systems with much less logging. The
problem was either that asynchronous logging was not turned on, or the I/O subsystem was
abnormally slow for other reasons, such as other heavy demand on storage, or just
intrinsically slow.
— Alex
On Sep 15, 2022, at 5:18 PM, Henning Westerholt
<hw(a)gilawa.com> wrote:
Hello,
Kamailio is using the system interface for syslog, this is also a code which is quite
stable and has not seen a lot of changes in the last years.
People are using Kamailio with a lot of logging in high load situation usually without
problems, there has not been a lot of reports about that in the past.
Maybe it something related to a specific distribution version? I checked, the rsyslog is
using asynchronous writing as default since a long time. What logging engine do you use?
Cheers,
Henning
--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://gilawa.com
-----Original Message-----
From: sr-users <sr-users-bounces(a)lists.kamailio.org> On Behalf Of Jeremy Kister
Sent: Thursday, September 15, 2022 9:59 PM
To: sr-users(a)lists.kamailio.org
Subject: Re: [SR-Users] Log levels severely impacts performance
On 9/13/2022 10:18 PM, Amit wrote:
--
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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Does anyone have any experience with this or have
any suggestions? We
are finding it difficult to scale as a result of this issue.
I was just dealing with this behavior. I was logging to a local rsyslog and rsyslog was
just writing to a file on a local ssd (unsynced).
It's a ton of log. But meh.
I disabled syslog entirely and enabled log_stderror = yes
Then I just captured stdout+stderr via multilog and write it to a file on the disk. The
problem went away.
I think there is some huge overhead in the way kam packages up the log and sends it out
to syslog.
--
Jeremy Kister
https://jeremy.kister.net./
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