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Subject: Re: [OMPI users] Handling output of processes
From: jody (jody.xha_at_[hidden])
Date: 2009-01-22 09:26:46


Hi
I downloaded 1.3 the day its release was announced :)

I now wanted to try it, so i pieced it together from orte-iof --help:
- started an mpirun with 4 process
- opened a new terminal
- did ps to find the mpirun's pid
- then: orte-iof --pid 8449 --rank 0 --stdout
but nothing happens...
So did i misunderstand its usage?

I quickly glanced at the code - i guess
  orte_iof.pull(&target_proc, stream, 1)
is the heart of the matter. But i was unable to fnd where this
orte-iof struct fas actually defined. COUld you give me a hint?

Thanks
  Jody

On Thu, Jan 22, 2009 at 2:33 PM, Ralph Castain <rhc_at_[hidden]> wrote:
> If you are willing/able to upgrade to 1.3, you will find a new utility
> called "ompi-iof" (or "orte-iof") that allows you to capture the output
> from any specified rank or combination of ranks. Note that the output is
> copied to the tool, so it will also still arrive at the output of mpirun.
>
> If you want to build your own version of that utility, you can use this tool
> as an example of how to do it - the source is at orte/tools/orte-iof. Feel
> free to ask questions.
>
> If you need to do this with a prior release....well, I'm afraid it won't
> work. :-)
>
> Ralph
>
> On Jan 22, 2009, at 1:58 AM, jody wrote:
>
>> Hi
>> I have a small cluster consisting of 9 computers (8x2 CPUs, 1x4 CPUs).
>> I would like to be able to observe the output of the processes
>> separately during an mpirun.
>>
>> What i currently do is to apply the mpirun to a shell script which
>> opens a xterm for each process,
>> which then starts the actual application.
>>
>> This works, but is a bit complicated, e.g. finding the window you're
>> interested in among 19 others.
>>
>> So i was wondering is there a possibility to capture the processes'
>> outputs separately, so
>> i can make an application in which i can switch between the different
>> processor outputs?
>> I could imagine that could be done by wrapper applications which
>> redirect the output over a TCP
>> socket to a server application.
>>
>> But perhaps there is an easier way, or something like this alread does
>> exist?
>>
>> Thank You
>> Jody
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