[mpich-discuss] Can't receive messages

[Pavan Balaji]

Most often, this is not a problem on “well setup” clusters that have a resource manager installed on them.  While not exclusive, 99% of the time, we see this problem when someone is trying to run mpich between their laptop and some remote server.

  — Pavan

On Jan 1, 2014, at 2:00 PM, Reuti <reuti at staff.uni-marburg.de> wrote:

> Am 01.01.2014 um 20:25 schrieb Jeff Hammond:
> 
>> Isn't the process manager infrastructure hetero-safe? At the very least, ssh-ing "uname -a" around the ring of procs can identify the problem on O(1) cost. 
> 
> As there are clusters without `ssh` availability (i.e. MPICH is running tightly integrated in a queuing system), I would put this in the initial startup call to the slave daemons: `hydra_pmi_proxy` could get an additional parameter about the architecture of the machine where `mpiexec` was issued. It could then return instantly with an error code for something like "refuse to participate".
> 
> -- Reuti
> 
> 
>> Jeff
>> 
>> Sent from my iPhone
>> 
>>> On Jan 1, 2014, at 11:33 AM, Pavan Balaji <balaji at mcs.anl.gov> wrote:
>>> 
>>> 
>>> If we detect what the local architecture is, how will we communicate it to other processes without having some infrastructure that is hetergeneous-architecture safe?
>>> 
>>> — Pavan
>>> 
>>>> On Jan 1, 2014, at 9:50 AM, Jeff Hammond <jeff.science at gmail.com> wrote:
>>>> 
>>>> One wonders if MPICH could verify the system was sufficiently homogeneous to function properly during initialization rather than defer detection to an error during communication calls. 
>>>> 
>>>> Jeff
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>>> On Jan 1, 2014, at 8:07 AM, Matthias Neuer <mneuer at web.de> wrote:
>>>>> 
>>>>> Am 31.12.2013 18:44, schrieb Pavan Balaji:
>>>>>> 
>>>>>> On Dec 31, 2013, at 10:11 AM, Matthias Neuer <mneuer at web.de> wrote:
>>>>>> 
>>>>>>>> On 12/31/2013 04:34 PM, Pavan Balaji wrote:
>>>>>>>> 
>>>>>>>> Are matze-debian and notebook of the same architecture (x86_64 and running the same OS/configuration)?
>>>>>>> 
>>>>>>> No, notebook is x86_32 on debian stable and matze-debian is x86_64 on debian testing, but I compiled the program for each system separately.
>>>>>> 
>>>>>> Such heterogeneous configurations are not supported in mpich.
>>>>> 
>>>>> Ok, thats the problem then. I didn't find that information in the FAQ or
>>>>> in the installation manual.
>>>>> 
>>>>> Thanks for your help.
>>>>> Matthias
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>>> 
>>> --
>>> Pavan Balaji
>>> http://www.mcs.anl.gov/~balaji
>>> 
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> 
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--
Pavan Balaji
http://www.mcs.anl.gov/~balaji