[slime-devel] SLIME snapshot (unix, sbcl): take3 (+ background-save-image)

[Helmut Eller]

* Anton Kovalenko [2010-08-20 11:30] writes:

>> This asynchronous mode seems complicated.  Saving the image doesn't take
>> that long to justify a complicated interface.  
>
> It depends on the image size. On my AMD x86-64, it takes 200Mb of the
> core to dump MCCLIM(+examples), climacs and closure. Rollback/restart
> (especially to the last loaded core) takes "no time at all" (visually),
> while dumping may take 20-30 seconds.

6-10 MB per second seems slow.  Hmm.. I guess slow is the SBCL way :-)

[...]
> Keeping fully asynchronous implementation for SBCL has one more major
> advantage: with #+(and sbcl unix) timers, I may schedule periodic
> background checkpoints in SBCL; it works without initiating anything
> from emacs, but still reports to emacs about successful dumps. *This*
> use case gets significantly more complicated if we prefer synchronous
> (serve-event) while waiting for the child process completion.

OK, that sounds somewhat useful.

I committed it with some minor modifications.

Helmut