[erlang-questions] ssl_connection process hibernation option

Kaiduan Xie <>
Mon Feb 7 16:33:45 CET 2011


Ingela,

May I have a suggestion to have the option to set the idle time for
SSL connection so that after a mount of time of idle, the SSL
connection will be put into hibernation?

Thanks,

/Kaiduan

On Mon, Feb 7, 2011 at 3:32 AM, Ingela Andin <> wrote:
> Hi!
>
> We (the OTP team) would consider it.
>
> Regards Ingela Erlang/OTP team - Ericsson AB
>
>
> 2011/2/4 Jeroen Koops <>:
>> Hi Ingela,
>> Thanks for your response. Suppose I come up with a patch for this, do you
>> think the OTP team would consider it for inclusion in an upcoming release?
>>
>> On Fri, Feb 4, 2011 at 4:51 PM, Ingela Andin <> wrote:
>>>
>>> Hi!
>>>
>>> We already put some effort into cleaning the state of the gen_fsm
>>> processes holding the connection,
>>> but some form of hibernation could be interesting too we will take
>>> this into consideration.
>>>
>>> Regards Ingela Erlang/OTP team - Ericsson AB
>>>
>>> 2011/2/4 Jeroen Koops <>:
>>> > I would very much appreciate this too.
>>> >
>>> > As a test, I inserted a proxy-module between the gen_fsm and
>>> > ssl_connection
>>> > callback, that changes all responses from the ssl_connection callback to
>>> > include the 'hibernate' option (it's not a hack -- it's AOP!) and the
>>> > savings are dramatic: before the change an SSL connection used around
>>> > 350
>>> > kB, after the change only around 600 bytes. If a system is maintaining
>>> > thousands of SSL connections, this really adds up.
>>> >
>>> > If we could somehow get hibernation built in to the ssl application,
>>> > that
>>> > would be great.
>>> >
>>> > On Fri, Feb 4, 2011 at 9:57 AM, Ferenc Holzhauser <
>>> > > wrote:
>>> >
>>> >> Hi,
>>> >>
>>> >> I'm using R14B01 new SSL to set up a lot of (not very active) client
>>> >> connections.
>>> >>
>>> >> I have noticed that ssl_connection processes use a lot of memory
>>> >> between
>>> >> GC's.
>>> >> A forced GC makes them small again until the next piece of received
>>> >> data.
>>> >>
>>> >> This adds up to a significant memory usage (around 350-400 kB/session
>>> >> on a
>>> >> x64 system in my case) limiting the number of possible sessions.
>>> >>
>>> >> An option to hibernate this gen_fsm would decrease the average memory
>>> >> usage
>>> >> in this scenario.
>>> >>
>>> >> Would it be possible to introduce this option?
>>> >>
>>> >> Thanks in advance,
>>> >> Ferenc
>>> >>
>>> >
>>
>>
>
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