[mpich-discuss] MPI_Comm_spawn / MPI_Info question

[Christoph Sprenger]

excellent, thanks a lot !

On 17/09/12 12:20, Pavan Balaji wrote:
>
> Hydra does respect the "hosts" environment variable.  However, it 
> might have been added after 1.4.1p1 was released.  You can pick the 
> 1.5rc1 release of Hydra and use it with mpich2-1.4.1p1 (it's backward 
> compatible).
>
> Note that "host" is a part of the MPI standard, while "hosts" is not. 
> So you'll be using a Hydra-specific option.
>
>  -- Pavan
>
> On 09/16/2012 07:18 PM, Christoph Sprenger wrote:
>>
>> doh accidently pressed ctrl-enter.
>>
>> it seems that hydra passes envall by default to spawned nodes which
>> solves pretty much my previous issue.
>>
>> i am trying to figure out if its possible to do the following:
>> MPI_Info_set(info, "hosts", "node1,node2");
>>
>> seems that they all get launched on the original node where mpiexec 
>> was run.
>>
>> MPI_Info_set(info, "host", "node2");
>> seems to work fine and it spawns as expected on the other machine.
>> preferably i wanted to avoid generating a hostfile and was curious if
>> thats possible to supply multiple machines directly in the MPI_Info.
>>
>> Cheers,
>> Christoph
>>
>>
>>
>>
>> On 17/09/12 12:06, Christoph Sprenger wrote:
>>>
>>> Thanks for that Pavan.
>>> Just installed and upgraded and super happy how smooth that went.
>>>
>>>
>>>
>>>
>>> On 16/09/12 17:19, Pavan Balaji wrote:
>>>>
>>>> Can you upgrade to the latest version of mpich2?  1.2.1p1 is too old;
>>>> it uses a different process manager which is not supported anymore.
>>>>
>>>>   -- Pavan
>>>>
>>>> On 09/15/2012 09:23 PM, Christoph Sprenger wrote:
>>>>> Hi,
>>>>>
>>>>> I've been trying to get MPI_Info to work with the Spawn interface, 
>>>>> but
>>>>> seems like the env vars aren't supplied to the new processes.
>>>>> I've been searching the docs and source, but can't find the list of
>>>>> hints for mpich2, so i am not sure if "envlist" is the right key for
>>>>> the
>>>>> mpd.
>>>>> not sure if i missed the obvious. is there an overview somewhere 
>>>>> of all
>>>>> the reserved keys ( eg envall,... )
>>>>>
>>>>>
>>>>>
>>>>> MPI_Info info;
>>>>> MPI_Info_create(&info);
>>>>> MPI_Info_set(info, "envlist", "CUSTOM_VAR");
>>>>>
>>>>> ...
>>>>> MPI_Comm_spawn(argv[0], &argv[1] , n, info, 0, MPI_COMM_WORLD,
>>>>> &intracomm, MPI_ERRCODES_IGNORE);
>>>>>
>>>>>
>>>>> i currently use mpich2-1.2.1
>>>>>
>>>>>
>>>>> Cheers,
>>>>> Christoph
>>>>>
>>>>>
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>>>>>
>>>>
>>>
>>
>