[erlang-questions] ssl_connection process hibernation option

Ingela Andin <>
Fri Feb 4 16:51:42 CET 2011


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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