[mpich-discuss] Running mpich without mpiexec

[Dmitriy Lyubimov]

Thank you Kenneth. I figured as much. No matter how long i searched, it
seems this question keeps popping up and there is no solution to date.

On the bright side i figured, oh well, we can launch the separate workers,
configure them into one intra communicator via MPI_Comm_accept() and
intracomm_merge() and pass in the task via shared memory. It seems to be
working although direct in-process control over task data hand-off would be
nicer still.

Thank you for the issue tracker!
-dmitriy

On Tue, Apr 26, 2016 at 8:18 AM, Kenneth Raffenetti <raffenet at mcs.anl.gov>
wrote:

> Hi Dmitriy,
>
> mpiexec is still needed for this type of operation with MPICH today. This
> ticket has some of the previous discussion about singleton init and spawn,
> but there hasn't been much demand for the feature.
> https://trac.mpich.org/projects/mpich/ticket/1074
>
> Ken
>
>
> On 04/21/2016 12:18 AM, Dmitriy Lyubimov wrote:
>
>> Hi,
>>
>> I guess i need to be asking more specific questions.
>>
>> I saw the same issue has been raised a few years ago and apparently
>> there was no solution for it back then, so i thought i'd check again.
>>
>> The question is about bypassing mpiexec and trying to connect already
>> running processes (which already have some data in memory to share with
>> mpi tasks) into a single communicator without having to spawn yet
>> another process with mpiexec.
>>
>> Suppose one of this processes uses MPI_Comm_accept, and the other
>> somehow know the mpi port name and would use MPI_Comm_connect() to
>> connect to it.
>>
>> Everything works as long as both server and client started with mpiexec
>> -n 1. However, without mpiexec, the same attempts cause errors and
>> connection never happens:
>>
>> mpiexec at Intel-Kubu] match_arg (utils/args/args.c:159): unrecognized
>> argument pmi_args
>> [mpiexec at Intel-Kubu] HYDU_parse_array (utils/args/args.c:174): argument
>> matching returned error
>> [mpiexec at Intel-Kubu] parse_args (ui/mpich/utils.c:1596): error parsing
>> input array
>> [mpiexec at Intel-Kubu] HYD_uii_mpx_get_parameters (ui/mpich/utils.c:1648):
>> unable to parse user arguments
>> [mpiexec at Intel-Kubu] main (ui/mpich/mpiexec.c:153): error parsing
>> parameters
>>
>>
>> So, there's no way of working around the necessity to spawn an entirely
>> new process with mpiexec?
>>
>> Thank you very much for your help.
>> -Dmitriy
>>
>>
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