Re: [OMPI devel] Using ompi_proc_t's proc_name.vpid as Universal rank

[Sajjad Tabib]

Hi, 

Thanks for the clarification. So, now I am wondering how rank information 
regarding processes in MPI_COMM_WORLD are assigned. Is there a table that 
stores unique integer values for processess or is rank assignment done in 
some other manner? 

Thanks,

Sajjad Tabib




Tim Prins <tpr...@cs.indiana.edu> 
Sent by: devel-boun...@open-mpi.org
11/30/07 07:22 AM
Please respond to
Open MPI Developers <de...@open-mpi.org>


To
Open MPI Developers <de...@open-mpi.org>
cc

Subject
Re: [OMPI devel] Using ompi_proc_t's proc_name.vpid as Universal rank






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
> 
> 
> 
> 
> ___
> devel mailing list
> de...@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/devel

___
devel mailing list
de...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/devel

[OMPI devel] Using ompi_proc_t's proc_name.vpid as Universal rank

[Sajjad Tabib]

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