Quoting "Brian W. Barrett" <brbarret_at_[hidden]>:
Thank's Brian, It is exactly what I wanted to know.
Regards.
> On Fri, 14 Mar 2008, Blaise-Omer.Yenke_at_[hidden] wrote:
>
> > I'd like to mesure the synchronisation time for the checkpoint of an MPI
> > job. To do so, I'd like to know the data structure of the bookmark
> > exchanged among the job's processes before they are individually
> > checkpointed. I'd also like to know if the bookmark's size is fix what
> > ever the size of the job and it's number of processes.
>
> The data structure sent between peers for bookmarking is a simple
> structure containing a couple of fields (bytes / messages in flight,
> mainly). It's less than 32 bytes, so it's pretty small. I don't remember
> the exact details, but the code is available on our web page. The
> bookmark structure's size is fixed -- it does not scale with number of
> processes in the job. However, the total amount of data sent to setup a
> checkpoint does scale with the number of nodes (as there are more
> instances of the bookmark structure being sent around).
>
> Hope this helps,
>
> Brian
>
> --
> Brian Barrett
> LAM/MPI Developer
> Make today a LAM/MPI day!
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