On 23 July 2013 16:53, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

first, to clarify, is the system memory or kamailio's pkg/shm memory running out? If the operating system runs out of memory, then should be a leak in a library, because kamailio modules uses only from a pre-allocated chunk, not going over it.

On 7/23/13 7:33 AM, David Cunningham wrote:

Hello,

We're running a Kamailio 3.3.4 system, and Kamailio is slowly using more and more memory. Over a couple of weeks it will run out of system memory.

We tried to enable memory debugging doing the following, but it resulted in Kamailio not responding to any SIP packets. Would anyone have advice please on how to debug the situation?

1. In Makefile.defs set MEMDBG to 1 and recompile Kamailio.
2. In kamailio.cfg add the line:
#!define DEBUG_MEMORY 1

do you set something special in config when DEBUG_MEMORY is 1? It is not by default there, so I assume you added some rules based on this pre-processor directive.

For memory troubleshooting, set memlog to a value lower than debug parameter in config file and try with mem_summary=12 for a more compact output. See more about these parameters in the wiki:

- http://www.kamailio.org/wiki/cookbooks/3.3.x/core#memlog

Run kamailio for a while in normal conditions, then restart it to get the memory usage summaries. There should be indication if there is some leak, by seeing memory chunks allocated many times from a function used at runtime. You can send the memory summary for a process here, we can look at it.

While this was running and Kamailio didn't respond to packets, it logged lots of lines like this:

Do you have syslog to be configured in asynchronous mode? See the notes from:

- http://www.kamailio.org/wiki/tutorials/3.2.x/syslog

The memdbg is less than debug value, that means printing few log messages for each memory operation. You can make memdbg higher and rely on memlog for memory summaries, otherwise will be lot of log messages related to memory.

Jul 22 21:32:22 hostname kamailio: : <core> [mem/q_malloc.c:369]: qm_malloc(0x4000e008, 128) called from <core>: cfg.lex: addstr(1438)
Jul 22 21:32:22 hostname kamailio: : <core> [mem/q_malloc.c:413]: qm_malloc(0x4000e008, 128) returns address 0x40048918 frag. 0x40048900 (size=128) on 1 -th hit
Jul 22 21:32:22 hostname kamailio: : <core> [mem/q_malloc.c:369]: qm_malloc(0x4000e008, 128) called from <core>: cfg.lex: addstr(1438)
Jul 22 21:32:22 hostname kamailio: : <core> [mem/q_malloc.c:413]: qm_malloc(0x4000e008, 128) returns address 0x400489c8 frag. 0x400489b0 (size=128) on 1 -th hit

addstr() is a function used only for parsing configuration file, as long as you can still see them, the configuration file parsing was not finish. addstr() is not a source of leaks because it is not used at runtime.

If you have large config file, then you can get close to the limits of the private memory, which is set to 4MB. You can increase its value using -M parameter (e.g., start kamailio with -M 8 to set it to use 8MB of memory).

Over the time, the private memory can get used due to fragmentation, you can set the mem_join parameter in config file to avoid it (works when compiled with MEMDBG=1).

To monitor usage of internal pkg memory, then you can use sercmd with pkg.stats command:

http://kamailio.org/docs/modules/3.3.x/modules_k/kex.html#idp16972640

Shared memory stats are printed by 'kamctl fifo get_statistics shmem:'

When you see significant increase of the memory usage, then you can restart to get the summaries.

You should run these commands after start, just to see the initial usage of memory.

Cheers,
Daniel

--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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