Ingo Molnar wrote: > * Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> 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 _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers