[mpich-discuss] Can I run MPI program without mpirun/mpiexec?

[Jayesh Krishna]

 Nope... Some of our users run MPI jobs with multiple processes (using smpd) without mpiexec (They have to provide the PMI environment manually).
 I would recommend trying out hydra.

Regards,
Jayesh
----- Original Message -----
From: "Pavan Balaji" <balaji at mcs.anl.gov>
To: mpich-discuss at mcs.anl.gov
Sent: Tuesday, February 23, 2010 5:42:16 PM GMT -06:00 US/Canada Central
Subject: Re: [mpich-discuss] Can I run MPI program without mpirun/mpiexec?


I believe Jayesh meant single process MPI jobs can be launched without
mpiexec/mpirun.

You can try using Hydra, instead of mpd, if you want to cross-compile
(configure option --with-pm=hydra).

 -- Pavan

On 02/23/2010 05:25 PM, John Xu wrote:
> Hi, Dave.
> 
> Thanks a lot for the email.
> 
> The problem for me is that I had a major problem trying to cross-compile Python
> for alpha. Without Python, I can not use the good process managers
> MPICH2 provides.
> 
> I am trying to see if there is anyway to run a statically compiled
> binary in a standalone
> fashion. According to Jayesh, it is possible. But I can not
> successfully run it myself.
> 
> I am still wondering if there is any possibility to do this ...
> 
> thanks,
> john
> 
> On Tue, Feb 23, 2010 at 5:17 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:
>> Basically, this won't work.
>>
>> The process manager plays a necessary role in starting the MPI processes and
>> bootstrapping their communication.  It is extremely unlikely that you will
>> be able to make something sensible work by running the processes yourself
>> and just twiddling a few environment variables (for more than a single
>> process, anyway).
>>
>> -Dave
>>
>> On Feb 23, 2010, at 5:06 PM, John Xu wrote:
>>
>>> Hi,
>>>
>>> I ended up trying to setup the environment manually myself and got the
>>> program to run
>>> without mpiexec.
>>> However, the process I kicked off does not seems to reflect the number
>>> of processes
>>> I requested.
>>>
>>> For example, I set PMI_RANK = 0 and PMI_SIZE=2,
>>> but when I launched cpi, I got the following:
>>>
>>> Process 0 of 1 is on (none)
>>> pi is approximately 3.1415926544231332, Error is 0.0000000008333401
>>> wall clock time = 0.000976
>>>
>>> The total number of processes is 1 instead of 2.
>>>
>>> Any idea of what environment variable I need to set to get the desired
>>> behaviour?
>>>
>>> Thanks,
>>> john
>>>
>>> On Tue, Feb 23, 2010 at 4:25 PM, John Xu <johnzxu at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> I am trying to start up mpi process in a processor simulator
>>>> environment. So I have the same problem
>>>> as formerly posted in
>>>>
>>>>  https://lists.mcs.anl.gov/mailman/htdig/mpich-discuss/2009-November/006008.html
>>>>
>>>> Jayesh,
>>>>
>>>> You indicated that there is a way similar to the windows debugging by
>>>> starting processes at manually.
>>>> But it requires two command prompts.
>>>>
>>>> Does it work for a linux environment running SMP with say 2 cores?
>>>>
>>>> Since I only have one dummy term emulated from the simulator, I can
>>>> not get two command prompts.
>>>> Can I setup the environment as in your document and start two
>>>> processes in the background?
>>>>
>>>> thanks,
>>>> john
>>>>
>>>>
>>>> -----------------------------------------------------------
>>>>  Hi,
>>>>  Yes, you can run an MPI program without mpiexec/mpirun. Let us know
>>>> if you have any problems.
>>>>
>>>> Regards,
>>>> Jayesh
>>>> ----- Original Message -----
>>>> From: "junli gu" <gujunli at gmail.com>
>>>> To: mpich-discuss at mcs.anl.gov
>>>> Sent: Friday, November 20, 2009 2:58:30 PM GMT -06:00 US/Canada Central
>>>> Subject: [mpich-discuss] Can I run MPI program without mpirun/mpiexec?
>>>>
>>>>
>>>> Hi everyone:
>>>>
>>>> I want to run mpi program like a normal binary without mpirun/mpiexec
>>>> command, like this: ./mpi_hello . Is this possible?
>>>>
>>>> This is possible only that I can compile mpi program and put all the
>>>> runtime information into a stand alone binary. I don't know if it is
>>>> possible.
>>>>
>>>> Thank you very much!
>>>>
>>>> --
>>>> ************************************************
>>>> Junli Gu--谷俊丽
>>>> Coordinate Science Lab
>>>> University of Illinois at Urbana-Champaign
>>>> ************************************************
>>>>
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji
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