[erlang-questions] Persistent processes

Kirill Zaborski <>
Tue Jul 10 16:06:40 CEST 2007

So the persistent process calls some module:perstist_state(SomeState)?
And then after restart some utility process runs
Quite reasonable, thanks.


On 7/10/07, Ladislav Lenart <> wrote:
Kirill Zaborski wrote:
> > Is there some way to do subj? I.e. I'd like to spawn a process, then I
> > turn off Erlang emulator and just before that I write the state of the
> > process to the disk. I see erlang:hibernate and sys:suspend but no
> > info about processes surviving emulator restart.
> > The question may seem strange but how can I implement such a behaviour?
> Hello,
> as far as I know there is no BIF that can do that. But
> process in question can store persistent portion of its
> state in a mnesia table (identified by unique address)
> after each checkpoint (for example after each request
> or after some period of time). Then you can have another
> (ram_copies) table which maps addresses to actual process
> pids. If the process state table is of type disc_copies
> you have persistent processes.
> At least this is how we are doing it (work still in progress).
> Hope this helps,
> Ladislav Lenart
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