[mpich-discuss] Can't receive messages

[Jeff Hammond]

Configure figures these out already and can write them to a file as part of installation. Are type sizes not encoded in datatypes #define anyways?

Jeff

Sent from my iPhone

> On Jan 2, 2014, at 1:15 PM, Pavan Balaji <balaji at mcs.anl.gov> wrote:
> 
> 
> You need a C program to figure out the datatype layouts.  And how do you pass the values upstream to the process that did the ssh?  Through stdout?  That’s not safe since ssh can throw out other spurious output.  You’ll need to open your own connections and such.  That is no longer a simple script.
> 
>  — Pavan
> 
>> On Jan 2, 2014, at 7:32 AM, Jeff Hammond <jeff.science at gmail.com> wrote:
>> 
>> What if the proxy app is just a shell script that parses the magic number file?
>> 
>> Jeff
>> 
>> Sent from my iPhone
>> 
>>> On Jan 1, 2014, at 6:49 PM, Pavan Balaji <balaji at mcs.anl.gov> wrote:
>>> 
>>> 
>>> On Jan 1, 2014, at 6:30 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
>>>>> The only thing you can do is have mpiexec ssh to each node, and get the information needed.  This is (1) not scalable, and (2) not viable unless we start distributing a program that gets the datatype information for all datatypes we care about and compare the bits inside mpiexec.
>>>> 
>>>> Can't you do this in a tree rather than root-to-all?
>>> 
>>> No.  To do a tree, I need some proxy application that I need to run on the intermediate nodes, that will do the second-level ssh. This proxy application will need to be heterogeneous-safe if it needs to communicate with mpiexec.
>>> 
>>> — Pavan
>>> 
>>> --
>>> Pavan Balaji
>>> http://www.mcs.anl.gov/~balaji
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> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
> 
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