Re: [Sbcl-help] saving and loading images

[jim b. <ji...@sd...>]

Nikodemus Siivola wrote:
> On Thu, 7 Jul 2005 ji...@dr... wrote:
> 
>> couple of questions about images - I can write an image core with 
>> sb-ext:save-lisp-and-die but then need to kill sbcl/slime...from the 
>> manual
> 
> 
> Not "need to kill", it does that for you: if save-lisp-and-die does not
> end your session please report this as a bug. Of course, if you are 
> saving cores with multiple threads running all bets are off.
> 
>> "It corrupts the current Lisp image enough that the current process 
>> needs to be killed afterwards. This can be worked around by forking 
>> another process that saves the core."
>>
>> how is this done?
> 
> 
> Like this (read the wait and fork manpages for details):
> 
> * (require :sb-posix)
> 
> ("SB-GROVEL" "SB-POSIX")
> * (let ((pid (sb-posix:fork)))
>     (if (zerop pid)
>         (save-lisp-and-die "foo.core")
>         (sb-posix:wait)))
> [doing purification: roots handlers stack bindings static cleanup done]
> [undoing binding stack and other enclosing state... done]
> [saving current Lisp image into /Users/demoss/Sources/sbcl/foo.core:
> writing 21034864 bytes from the read-only space at 0x01000000
> writing 6256504 bytes from the static space at 0x08000000
> writing 2144 bytes from the dynamic space at 0x40000000
> done]
> 
> 674
> 0
> * (lisp-implementation-version)
> 
> "0.9.2.31"
> 
>> Also, how can I load the image later into a sbcl session in 
>> slime/emacs? sbcl --core mycore works but that's launching a raw sbcl 
>> process...
> 
> 
> You can't switch or load cores into a running SBCL. The core is in the 
> SBCL: runtime contains code to start the core, the garbage collector and 
> bits of OS support, almost everything else is in the core. Loading a 
> core is a bit of misnomer anyways: starting a core is more accurate.
> 
> If you need to just save session data write SEXPs to a file and read it 
> back in. If you need a quick and dirty way of serializing things that is 
> faster then PRINT/READ Google for fasldump and bindum. If you need to 
> serialize large amounts of data write an appropriate specialized format 
> ("everything is just a bucket of bits"). ...and then there all the 
> persistense frameworks, DB interfaces, etc.
> 
> Saving cores is mainly a delivery method, IMO.
> 
> (This is not to say that it cannot be co-opted for other purposes, but 
> that is beside the point.)
> 
> Cheers,
> 
>  -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
>                   Lispnik: "Buddha is big, has hairy armpits, and laughs."
> 
> 
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thanks, that explains a lot.