From: Michael Neumann <mneumann@...>
Date: 2004-11-24T19:57:36+09:00
Subject: Re: [Ann] Checkpointing Ruby applications (DragonFlyBSD only)

Lothar Scholz wrote:
> Hello Michael,
> 
> MN>    Checkpoint.checkpoint('dump') do
> MN>       # setup sockets on resume
> MN>       $conn = TCPServer.open('localhost', 9999)
> MN>    end
> 
> MN> If you resume from "dump" (type 'checkpt -r dump' on command line, or
> MN> 'ruby -r checkpoint -e 'Checkpoint.resume("dump")'), the block will be
> MN> executed.
> 
> Did you any measurements how much time is saved for startup of a
> complexer ruby program with lots of requires ? Something like
> FreeRide would be nice. I don't have BSD installed so i can't do it myself.

Not yet. I never had timing problems with lots of requires...
If I can compile freeride (FX...) easily I'll report my results.

> Also why isn't it possible to directly run the checkpoint file from
> the shell ?

It is possible:

   checkpt -r checkpoint-file

Well, it's in reality a core-dump (or so I'm told), and it has to be 
sent the CKPTEXIT signal, so that it can perform some setup-tasks... and 
it will return from the sys_checkpoint syscall with a given value. Not 
sure how this all could be done easily with a directly executable file, 
without modifying the core-dump to much.

Regards,

   Michael