Re: persistent xterm sessions

["Tom Metro-12" <user=71@nabble.blu.org>]

 Gregory Boyce wrote: 
> Migrating a running process from one system to another would require 
> being able to take a snapshot of the program's running state in order to 
> replicate it on another system.  Seems like you should be able to write 
> that state to local disk for recovery after a reboot. 
> 
> Maybe someone with more hands on experience with this type of clustering 
> could confirm what sort of crack I'm smoking though. 

Apparently you are crack free, as it turns out someone has implement this: 

http://cryopid.berlios.de/

   CryoPID - A Process Freezer for Linux 

   CryoPID allows you to capture the state of a running process in Linux 
   and save it to a file. This file can then be used to resume the 
   process later on, either after a reboot or even on another machine. 

This kind of software seems to be called "checkpointing" and overlaps 
with both the clustering (process migration) and hibernation 
communities. The page above also links to: 

http://www.checkpointing.org/

which is a directory of similar software. 


One of the listed applications for CryoPID is saving the state of a 
screen session. :-) Unfortunately the tool is not quite up to the task 
yet, as it doesn't handle "Multiple processes with hierarchy" or "PTYs 
other than the current one." 

But it sounds promising. Even if it worked perfectly, it'd still need 
some integration work. Something that catches a GNOME shutdown signal 
and iterates over all the sessions, saving them to disk. 

Looks like the project has been stagnant since 2005, unfortunately, but 
there's still a trickle of activity on the mailing list and a recent 
message implies there might be a working CryoPID package for Ubuntu Gutsy. 

  -Tom 

-- 
Tom Metro 
Venture Logic, Newton, MA, USA 
"Enterprise solutions through open source." 
Professional Profile: http://tmetro.venturelogic.com/

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