[Users] memory issues

[Daniel-Constantin Mierla]

Hello,

that's the result of memory fragmentations, that should be the the 
capacity of the server, should stay at that rate. Memory manager 
allocates chunks of different sizes, but not merges then back by 
default. However, it tries to avoid allocating small sizes -- you can 
see in statistics used memory and real used sizes. The difference is not 
used but should ensure that shared variables will not fragment memory in 
small chunks.

You can try to compile openser with -DQM_JOIN_FREE (add it in DEFS 
variable of Makefile.defs) and test again. Free fragments should be 
merged and fragmentation should not occur -- processing will be slower. 
We will try for next release to provide a better solution for that.

Cheers,
Daniel

On 03/18/07 01:21, Christian Schlatter wrote:
> Christian Schlatter wrote:
> ...
>>
>> I always had 768MB shared memory configured though, so I still can't 
>> explain the memory allocation errors I got. Some more test runs 
>> revealed that I only get these errors when using a more production 
>> oriented config that loads more modules than the one posted in my 
>> earlier email. I now try to figure out what exactly causes these 
>> memory allocation errors that happen reproducibly after about 220s at 
>> 400 cps.
>
> I think I found the cause for the memory allocation errors. As soon as 
> I include an AVP write operation in the routing script, I get 'out of 
> memory' messages after a certain number of calls generated with sipp.
>
> The routing script to reproduce this behavior looks like (full config 
> available at http://www.unc.edu/~cschlatt/openser/openser.cfg):
>
> route{
>         $avp(s:ct) = $ct; # commenting this line solves
>               # the memory problem
>
>         if (!method=="REGISTER") record_route();
>         if (loose_route()) route(1);
>
>         if (uri==myself) rewritehost("xx.xx.xx.xx");
>         route(1);
> }
>
> route[1] {
>         if (!t_relay()) sl_reply_error();
>         exit;
> }
>
> An example log file showing the 'out of memory' messages is available 
> at http://www.unc.edu/~cschlatt/openser/openser.log .
>
> Some observations:
>
> - The 'out of memory' messages always appear after about 8000 test 
> calls per worker process. One call consists of two SIP transactions 
> and six end-to-end SIP messages. An openser with 8 children handles 
> about 64'000 calls, whereas 4 children only handle about 32'000 calls. 
> The sipp call rate doesn't matter, only number of calls.
>
> - The 8000 calls per worker process are independent from the amount of 
> shared memory available. Running openser with -m 128 or -m 768 does 
> not make a difference.
>
> - The more AVP writes are done in the script, the less calls go 
> through. It looks like each AVP write is leaking memory (unnoticed by 
> the memory statistics).
>
> - The fifo memory statistics do not reflect the 'out of memory' syslog 
> messages. Even if openser does not route a single SIP message because 
> of memory issues, the statistics still show a lot of 'free' memory.
>
>
> All tests were done with openser SVN 1.2 branch on Ubuntu dapper x86. 
> I think the same is true for 1.1 version but I haven't tested that yet.
>
>
> Christian
>