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

[John Xu]

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
>>> ************************************************
>>>
>> _______________________________________________
>> mpich-discuss mailing list
>> mpich-discuss at mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>
> _______________________________________________
> mpich-discuss mailing list
> mpich-discuss at mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>