Is gen_server behavior in R14B hibernate friendly?

[Zvi]

Hi,
I re-reading Erlang at Facebook slides. And found this. Is this still
an issue?

Zvi

"Hibernation
▪
Drastically shrink memory usage with erlang:hibernate/3
▪ Throws away the call stack
▪ Minimizes the heap
▪ Enters a wait state for new messages
▪ “Jumps” into a passed-in function for a received message
▪ Perfect for a long-running, idling HTTP request handler
▪ But ... not compatible with gen_server:call (and gen_server:reply)
▪ gen_server:call has its own receive() loop
▪ hibernate() doesn’t support have an explicit timeout
▪ Fixed with a few hours and a look at gen.erl"

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[Ulf Wiger]

Hi Zvi,

Actually, nowadays, gen_server supports 'hibernate' as a special
value of the internal timeout, so your server callbacks can instruct
the main loop to go into hibernation between messages.

It is true that hibernate/3 doesn't have a timeout, but OTOH, it is
easy enough to start a timer that will send a message, bringing
you out of hibernation, after a specified time.

BR,
Ulf W

On 6 Nov 2010, at 15:51, Zvi wrote:

> Hi,
> I re-reading Erlang at Facebook slides. And found this. Is this still
> an issue?
>
> Zvi
>
> "Hibernation
> ▪
> Drastically shrink memory usage with erlang:hibernate/3
> ▪ Throws away the call stack
> ▪ Minimizes the heap
> ▪ Enters a wait state for new messages
> ▪ “Jumps” into a passed-in function for a received message
> ▪ Perfect for a long-running, idling HTTP request handler
> ▪ But ... not compatible with gen_server:call (and gen_server:reply)
> ▪ gen_server:call has its own receive() loop
> ▪ hibernate() doesn’t support have an explicit timeout
> ▪ Fixed with a few hours and a look at gen.erl"
>
> ________________________________________________________________
> erlang-questions (at) erlang.org mailing list.
> See http://www.erlang.org/faq.html
> To unsubscribe; mailto:[hidden email]
>

Ulf Wiger, CTO, Erlang Solutions, Ltd.
http://erlang-solutions.com




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