UNIX Process Cryogenics?

Posted by Cliff on Friday January 25, 2002 @06:57AM from the if-laptops-can-do-it... dept.

shawarma asks: "Due to a recent power outage, I've had to shut down a server running a process that had been running for ages calculating something. The job it was doing would have been done in a few days, I think, but I had to shut it down before the UPS ran out of juice. This got me thinking: Why can't I freeze down the process and thaw it back up at a later time? It ought to be possible to take all the connected memory pages and save them in some way, preserve file handles and pointers, and everything. Maybe net-connections would die, but that's understandable. Has any work been done in this field? If not, shouldn't there be? I'd like to contribute in some way, but I think it's a bit over my head.." Laptops have been doing this in some form for years: most laptops, when they run out of power, or when told by the user will go into "suspend" mode which is similar to what the poster is describing, however outside of laptops, I haven't seen this done. Sleeping processes also do something similar, sending their memory pages into swap so other running processes can use the memory. What, if anything, is preventing someone from taking this a step further?

1 of 555 comments (clear)