Hi Daniel,
 
Does this problem affect 1.1.1 or only 1.2? Is there a patch to use for 1.1.1?
 
thank you
 
George
 
 
--------------------------------------------------------------------------------
 
Hello Ovidiu,

On 03/23/07 17:04, Ovidiu Sas wrote:
>
Hi Daniel,
>

> Can we backport this one to 1.2?
already done, two minutes after the commit in trunk.

Cheers,
Daniel

>

>
> Regards,
>
Ovidiu Sas
>

> On 3/22/07, Daniel-Constantin Mierla <daniel at voice-system.ro> wrote:
>> Hello,
>>

>> the supposed fragmentation turned out to be a mem leak in pkg. Please
>>
take the latest SVN version and try again to see if you got same
>>
results.
>>

>> Thanks,
>>
Daniel
>>

>> On 03/19/07 18:52, Christian Schlatter wrote:
>>
> ...
>>
>>> The memory statistics indeed show a high number of memory fragments:
>>
>>>
>>
>>> before 'out of memory':
>>
>>>
>>
>>> shmem:total_size = 536870912
>>
>>> shmem:used_size = 59607040
>>
>>> shmem:real_used_size = 60106488
>>
>>> shmem:max_used_size = 68261536
>>
>>> shmem:free_size = 476764424
>>
>>> shmem:fragments = 9897
>>
>>>
>>
>>> after 'out of memory' (about 8000 calls per process):
>>
>>>
>>
>>> shmem:total_size = 536870912
>>
>>> shmem:used_size = 4171160
>>
>>> shmem:real_used_size = 4670744
>>
>>> shmem:max_used_size = 68261536
>>
>>> shmem:free_size = 532200168
>>
>>> shmem:fragments = 57902
>>
>>>
>>
>>>>
>>
>>>> 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.
>>
>>>
>>
>>> Compiling openser with -DQM_JOIN_FREE did not help. I'm not sure how
>>
>>> big of a problem this fragmentation issue is.
>>
>> What is the number of fragments with QM_JOIN_FREE after flooding?
>>
>
>>
> The numbers included above are with QM_JOIN_FREE enabled.
>>
>
>>
>>> Do you think it would make sense to restart our production openser
>>
>>> instances from time to time just to make sure they're not running
>>
>>> into this memory fragmentation limits?
>>
>> The issue will occur only when the call rate reaches the limits of
>>
>> the proxy's memory. Otherwise the chunks are reused. Transactions and
>>
>> avps are rounded up to be sure there will be minimized the number of
>>
>> different sizes for memory chunks. It wasn't reported too often,
>>
>> maybe that's why no big attention was paid to it. This memory system
>>
>> is in place since the beginning of ser. Alternative is to use sysv
>>
>> shared memory, but is much slower, along with libc private memory
>>
>> manager.
>>
>
>>
> I've done some more testing and the same out-of-memory stuff happens
>>
> when I run sipp with 10 calls per second only. I tested with
>>
> 'children=1' and I only could get through about 8200 calls (again
>>
> those 8000 calls / process). And this is with QM_JOIN_FREE enabled.
>>
>
>>
> Memory statistics:
>>
>
>>
> before:
>>
> shmem:total_size = 536870912
>>
> shmem:used_size = 2311976
>>
> shmem:real_used_size = 2335720
>>
> shmem:max_used_size = 2465816
>>
> shmem:free_size = 534535192
>>
> shmem:fragments = 183
>>
>
>>
> after:
>>
> shmem:total_size = 536870912
>>
> shmem:used_size = 1853472
>>
> shmem:real_used_size = 1877224
>>
> shmem:max_used_size = 2465816
>>
> shmem:free_size = 534993688
>>
> shmem:fragments = 547
>>
>
>>
> So I'm not sure if this is really a fragmentation issue. 10 cps surely
>>
> doesn't reach the proxy's memory.
>>
>
>>
> Thoughts?
>>
>
>>
> Christian
>>
>
>>
>
>>
>
>>
>> Cheers,
>>
>> Daniel
>>
>>
>>
>>>
>>
>>> thanks,
>>
>>> Christian
>>
>>>
>>
>>>>
>>
>>>> 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
>>
>>>>>
>>
>>>
>>
>>>
>>
>
>>
>
>>
> _______________________________________________
>>
> Users mailing list
>>
> Users at openser.org
>> > http://openser.org/cgi-bin/mailman/listinfo/users
>> >
>>

>> _______________________________________________
>>
Users mailing list
>>
Users at openser.org
>> http://openser.org/cgi-bin/mailman/listinfo/users
>>
>
 
Γιώργος Παπαδόπουλος
Altec Telecoms
R&D Department
 
Πάτμου 14, 151 23 Μαρούσι
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e-mail: geop@altectelecoms.gr
 

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