From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Fri Mar 12 2010 - 11:47:38 PST
fengguang,
I am not an expert on the Open MPI parameters, but I believe that the
following page should have the documentation you need:
http://osl.iu.edu/research/ft/ompi-cr/api.php
I think "--mca snapc_base_global_snapshot_dir /some/directory" passed to
mpirun is what you want. If that is not correct, then you should
probably ask on one of the Open MPI mailing lists.
I am not aware of anything that monitor an mpi application and
automatically restarts it from a checkpoint if it crashes. Again,
asking on the Open MPI mailing lists may give a better answer.
As for documentation on the functions in libcr - at the moment the only
thing we have to offer is the comments in libcr.h and a few examples
(the comments if libcr.h refer to some of the examples).
-Paul
fengguang tian wrote:
> Hi,Paul
>
> I am using Open MPI now, and, yes, It works now, thank you. can i set
> a directory
> to store the checkpoint file(context.XXXXX), i saw these files are all
> in the program directory by default. and also, how to restart the
> checkpoint with the file context.XXXXX in the program automatically?
> Is it possiable that when the a running process crashed, the program
> restart automatically with the checkpoint file?
>
> BTW, is there any documents that introduce the usage of all these
> functions in the BLCR library, I cannot find any documents talks about
> that.
>
> Cheers!
> fengguang
>
> On Thu, Mar 11, 2010 at 11:42 PM, Paul H. Hargrove <PHHargrove_at_lbl_dot_gov
> <mailto:PHHargrove_at_lbl_dot_gov>> wrote:
>
> fengguang tian wrote:
>
> Hi
>
> my question is similar to this question:
> http://www.nersc.gov/hypermail/checkpoint/0283.html
>
> what head file I should include in my c program. when I write
> a program follow the
> advice:http://www.nersc.gov/hypermail/checkpoint/0732.html
>
> it doesn't work.
>
> *I want to implement checkpoint into a MPI c++ program ,and
> checkpoint the process periodically and automatically.*
>
>
> If you want to write code like entry 0732 in the mail archive
> you'll want to #include "libcr.h" and link with "-lcr".
>
> BLCR does not directly handle checkpointing of communications,
> such as used in MPI. Instead, BLCR provides mechanisms for an MPI
> implementation to participate in the checkpoint, in order to
> capture the state of communications. Therefore, in order to use
> BLCR with an MPI application, you will need to be using one of the
> MPI implementations that have integrated with BLCR. Of the
> commonly used MPI's both Open MPI and MVAPICH2 include BLCR
> integration. You should consult the documentation for whichever
> MPI you use to determine how to configure it for use with BLCR.
> Then you will also find in the MPI implementation-specific
> documentation some information on how the application can trigger
> a checkpoint.
>
> -Paul
>
> --
> Paul H. Hargrove PHHargrove_at_lbl_dot_gov
> <mailto:PHHargrove_at_lbl_dot_gov>
> Future Technologies Group Tel: +1-510-495-2352
> HPC Research Department Fax: +1-510-486-6900
> Lawrence Berkeley National Laboratory
>
>
--
Paul H. Hargrove PHHargrove_at_lbl_dot_gov
Future Technologies Group Tel: +1-510-495-2352
HPC Research Department Fax: +1-510-486-6900
Lawrence Berkeley National Laboratory