[CALUG] Saving/restoring process states
junekis at comcast.net
junekis at comcast.net
Wed Apr 5 12:35:33 CDT 2006
What you are wanting to do is often refered to as checkpoint/restore
It was a practice that was common back when computers were slow and unreliable and processes ran for a long time before completing.
Checkpoint/restore let a user recover part of the work that had been done in the event of a machine crash.
Try these utilities:
-------------- Original message ----------------------
From: "Jason C. Miller" <jason.c.miller at gmail.com>
> My questions are rarely simple...and here's another one. ;)
> Does anybody know of a method (or backdoor hack) that would allow a user
> to dump the current state of a process and then restore it later? Kind of
> analogous doing a <ctrl>-Z and then an 'fg' later when you want to
> unsuspend the proc except, in my instance, the process would be kill()ed
> for later resurection. Kinda like high-level context switch.
> If you're still confused as to what I mean, here's the example that
> started me wondering...
> I was using a game emulator that doesn't have a "save/restore game state"
> function. I figured it wouldn't behoove me too terribly much to try to
> come up with something on my own. Say I've been playing for hours and I'm
> tired. I really don't want to use the game's actual "Save" utility
> because it might start me at some predetermined checkpoint the next time I
> started the game (eg: metroid, zelda). So, I'd use this magical utility
> that I would like to save the current state of the process somewhere on
> non-volatile storage. Later (after so many days and so many reboots), I
> restore that process and continue exactly where I left off.
> 1. Does UNIX already have a method for doing this that I don't know about?
> 2. My OS fundamentals are rusty. Any reason why an OS wouldn't be able to
> support this? (waiting for the OS profs out there to chime in on this
> one). I understand that register values and such would be a problem,
> but if the process was suspended first, would that make a difference?
> 3. Any ideas anyone?
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