Hi Sajjad,
The vpid is not unique. If you do a comm_spawn then the newly launched
processes will have a new jobid, and their vpids will start at 0. So the
whole process name is unique.
However, there is talk now of being able to join 2 jobs that were
started completely independently. This may lead to the point where a
process name is no longer unique, however this work appears to be a ways
out and as far as I know no decisions have been made on it yet.
Hope this helps,
Tim
Sajjad Tabib wrote:
Hello,
I have a proprietary transport/messaging layer that sits below an MTL
component. This transport layer requires OpenMPI to assign it a rank
that is unique and specific to that process and will not change from
execution to termination. In a way, I am trying to find a one-one
correspondence between a process's universal rank in OpenMPI and this
transport layer. I began looking at ompi_proc_t from different processes
and seemingly found a unique identifier, proc_name.vpid. Consequently, I
assigned the ranks to each process in my transport layer based on the
value of the local vpid of each process.
I have not tested this thoroughly, but it has been working so far.
Although, I would like to make sure that this is a good approach, or
know, at least, whether if there are other ways to do this. I would
appreciate it if you could leave me feedback or give suggestions on how
to assign universal ranks to a proprietary transport software.
Thanks for your help,
Sajjad Tabib
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