Re: [OMPI users] MPI Spawn functionality and core allocation questions

[Aurelien Bouteiller]

You may want to look at the —oversubscribe mpirun option. 

If you want more control, you can consider making a rankfile where you place 
explicitly processes. 

Aurélien 

> Le 29 juin 2016 à 11:50, Jason Maldonis  a écrit :
> 
> Hi everyone,
> 
> I am having trouble developing a complicated parallelization algorithm with 
> MPI and I'm hoping for some tips (I am using OpenMPI 1.10.2). I posted the 
> latest problem I ran into on Stack Overflow and got a response from someone 
> saying they don't think it is possible to do the spawn allocation that I want.
> 
> You have all been very helpful in the past, so I am hoping to get your 
> opinions.
> 
> Briefly, I am trying to oversubscribe cores to run spawned processes while 
> the main program's processes sit and wait in a barrier.  Because the syntax 
> highlighting is better, it might be easiest to look at my post on Stack 
> Overflow than me trying to paste it in an email. Please see this link:  
> http://stackoverflow.com/questions/38087327/mpi-spawn-not-enough-slots-available-all-which-nodes-are-allocated-for-this-j
>  
> 
> 
> Thanks for your help,
> Jason
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[OMPI users] MPI Spawn functionality and core allocation questions

[Jason Maldonis]

Hi everyone,

I am having trouble developing a complicated parallelization algorithm with
MPI and I'm hoping for some tips (I am using OpenMPI 1.10.2). I posted the
latest problem I ran into on Stack Overflow and got a response from someone
saying they don't think it is possible to do the spawn allocation that I
want.

You have all been very helpful in the past, so I am hoping to get your
opinions.

Briefly, I am trying to oversubscribe cores to run spawned processes while
the main program's processes sit and wait in a barrier.  Because the syntax
highlighting is better, it might be easiest to look at my post on Stack
Overflow than me trying to paste it in an email. Please see this link:
http://stackoverflow.com/questions/38087327/mpi-spawn-not-enough-slots-available-all-which-nodes-are-allocated-for-this-j

Thanks for your help,
Jason