[erlang-questions] Problematic SSL message publication

Ryan Brown <>
Wed Sep 25 19:07:59 CEST 2013


Excellent Ingela! By upgrading to the R!6B02 we have been able to eliminate
the above stated issue with the Erlang message queues growing. However, we
are still seeing VERY slow throughput to ssl endpoints. In our limited,
scaled-back, test. We are seeing message throughput to an ssl endpoint at
12 msgs/sec and non-ssl of 300+ msgs/sec. Is there a connection limit for
ssl connections related to Erlang directly?

Thank you!

Best regards,

Ryan Brown


On Wed, Sep 25, 2013 at 6:58 AM, Ingela Andin <>wrote:

> Hi!
>
>
> 2013/9/25 Ryan Brown <>
>
>> Hi Ingela,
>>
>> Thank you for the response. I suppose I don't really know how to see what
>> messages are in the ssl queue. What I am looking at is nregs and watching
>> the "msgs" column growing at a steady pace. Is there a way to look at these
>> messages?
>>
>>
> You can use the observer application to look at erlang processes.
>
> http://www.erlang.org/erldoc?q=observe&x=0&y=0
>
>
>
>> As for reproducing in the latest version of ssl. I was planning on
>> upgrading a machine to 16 today and attempting to reproduce. This should
>> get me the latest ssl version correct?
>>
>>
> R16B02  (ssl-5.3.1) is the latest. There is a bug in ssl-5.1 (R15B02)
> version (fix in ssl5.2) that perhaps could be related to your problem.
>
> Regards Ingela Erlang/OTP Team - Ericsson AB
>
>
> On Wed, Sep 25, 2013 at 2:09 AM, Ingela Andin <>wrote:
>
>>
>> Hi!
>>
>>  2013/9/24 Ryan Brown <>
>>
>>> We have a fairly high-volume (28m+ messages/day) application that works,
>>> essentially, as a pub-sub for many internal and external applications. We
>>> are experiencing an issue under load where and subscribers that are using
>>> ssl are experiencing a significant slowness in delivery. When we restart
>>> the server we begin watching the processes in our application and we can,
>>> very reliably and fairly quickly, see the ssl_manager_sup process message
>>> queue start increasing in size. As this happens, all messages for those
>>> subscribers with ssl endpoints begin to back-up and delivery slows to a
>>> near halt.
>>>
>>>
>> What messages are there in the queue?
>>
>>
>>  It appears that ssl is a bit of a known issue within erlang. Or, at
>>> least, a tricky use-case to perfect. Are there any known issues that we can
>>> address in terms of configuration, best practices in setting-up ssl
>>> connections or anything else for that matter we can be doing to resolve
>>> this issue or more clearly identify the root cause? We're in active
>>> troubleshooting mode and doing what we can to dig deeper including
>>> dissecting the code to the kernel.
>>>
>>> We are running Erlang 15B02 (64bit).
>>>
>>>
>>>
>> So that would be ssl-5.1?  Is it possible to reproduce the problem on the
>> latest version ?
>>
>> Regards Ingela Erlang/OTP team - Ericsson AB
>>
>
>
>
> --
>> -rb
>>
>
>


-- 
-rb
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