[erlang-questions] ssl_connection process hibernation option

Ingela Andin <>
Tue Feb 8 08:19:00 CET 2011


Hi!

I think hibernation should be optional and if you choose to use it, it
could have configurtion parameters such as the
one you suggest.

Regards Ingela Erlang/OTP team - Ericsson AB

2011/2/7 Kaiduan Xie <>:
> 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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