Re: [bgl-discuss] MPI node 0 on bg/l

[Rob Ross <rross@xxxxxxxxxxx>]

Hi Hyong,

Maybe you should describe what an "integrator" does?

All the nodes of BG/L are "special" as compared to Linux nodes; lots of 
common UNIX functionality isn't there. Some system calls will link 
correctly but return ENOSYS. But I'm not sure that this is relevant.

Regards,

Rob

Lee, Hyong wrote:
> Hi all,
>
> I'm trying to get pgenesis, a neural simulation environment, to work on 
> BG/L.  It consists of an interpreter for a csh-like scripting language 
> and an integrator, among other things, all in the same binary.
>
> It compiles (with some minor modifications) and runs, and the script 
> interpreter runs fine on all nodes; however, when we try to call the 
> integrator, it seems to hang waiting for messages from node 0.  The same 
> scripts work on Jazz.
>
> Is there anything special about MPI node 0 on BG/L?  If so, is there 
> some documentation I can look at?  In the mean time, I am trying to see 
> if our model will run if we avoid integrating on node 0; of course, we 
> would like to understand the problem so we have some confidence in any 
> results we get with the workaround.
>
> Thanks for your help!
>
> Hyong Lee
> Software Engineer
> UofC Hospitals

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