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SubjectRe: [RFC v7][PATCH 0/9] Kernel based checkpoint/restart
Ingo Molnar wrote:
> * Dave Hansen <dave@linux.vnet.ibm.com> wrote:
>
>> On Tue, 2008-10-21 at 12:21 -0700, Andrew Morton wrote:
>>> On Mon, 20 Oct 2008 01:40:28 -0400
>>> Oren Laadan <orenl@cs.columbia.edu> wrote:
>>>> These patches implement basic checkpoint-restart [CR]. This version
>>>> (v7) supports basic tasks with simple private memory, and open files
>>>> (regular files and directories only).
>>> - how useful is this code as it stands in real-world usage?
>> Right now, an application must be specifically written to use these
>> mew system calls. It must be a single process and not share any
>> resources with other processes. The only file descriptors that may be
>> open are simple files and may not include sockets or pipes.
>>
>> What this means in practice is that it is useful for a simple app
>> doing computational work.
>
> say a chemistry application doing calculations. Or a raytracer with a
> large job. Both can take many hours (days!) even on very fast machine
> and the restrictions on rebootability can hurt in such cases.
>
> You should reach a minimal level of initial practical utility: say some
> helper tool that allows testers to checkpoint and restore a real PovRay
> session - without any modification to a stock distro PovRay.

There are the liblxc userspace tools doing that.

http://sourceforge.net/projects/lxc/

There are the lxc-checkpoint and lxc-restart commands to test the Oren's
patches with the external checkpoint Cedric did. These commands are
experimental and under development so a hack may be necessary for
checkpoint/restart.

I didn't tried with Oren's external checkpoint yet, but I think the
commands should work. Actually these commands relies on the freezer, so
the checkpoint command does freeze, checkpoint, unfreeze. (and kill if
specified).

lxc-create -n foo

lxc-start -n foo mypovray

lxc-checkpoint -s -n foo > myckptfile

lxc-restart -n foo < myckptfile

Thanks
-- Daniel


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