[mpich-discuss] Threaded Listener

[Eduardo]

I tried to use a newer MPICH, but, as you said, Hydra forks as part of
mpiexec. Is it possible to launch a job without mpiexec/mpirun ? That
should probably work in my environment (assuming that there is no listener
as a heavy process as it is the case in the default mpich-1.2.7p1).

The problem is not that the fork symbol is missing. The problem is that it
is been called. My environment actually has a dummy fork, but that only
causes the program to abort if it is called.

So in summary, the problem is that I cannot use mpiexec to launch a
program, because it calls fork. In mpich-1.2.7p1 , I can launch myself the
program as if I was launching a debug (as in section 3.5.6 of the CH_P4
manual). In addition, the mpich cannot issue a fork for a listener like
task, only threads.

Eduardo

On Sat, Jan 17, 2015 at 4:23 PM, Jeff Hammond <jeff.science at gmail.com>
wrote:

> MPICH shouldn't fork. Hydra probably uses fork to launch processes as part
> of mpiexec.
>
> Blue Gene doesn't support fork either and MPICH runs there, but the
> process launcher is not Hydra. Same for Cray last time I checked. So I'm
> sure that fork isn't required to use MPICH, at least if dynamic processes
> are not used.
>
> Is the issue that you cannot link an MPI program because the fork symbol
> is missing or that you cannot launch jobs with a Hydra?
>
> All mainstream MPI implementations use OS processes to implement MPI
> processes, but the standard doesn't require this. FG-MPI uses threads to
> implement MPI processes, but as it still uses Hydra (AFAIK), it may or may
> not work for you.
>
> Can you describe in detail what happens when you try to build and run
> MPICH-latest on your system?
>
> Jeff
>
> Sent from my iPhone
>
> On Jan 17, 2015, at 9:41 AM, Eduardo <erocha.ssa at gmail.com> wrote:
>
> I would use a newer version if I could. However, I cannot issue a fork in
> my embedded environment. I can create threads though.
>
> So, is there any newer versions of mpich that does not create heavy
> processes? I can live without MPI_Spawn and the like.
>
> Regards,
>
> Eduardo
> On Jan 16, 2015 5:42 PM, "Wesley Bland" <wbland at anl.gov> wrote:
>
>> Can you try using a more recent version of MPICH. The version you are
>> using is years old and we don't support it anymore. Our latest version is
>> 3.1.3. You might see if the issue is still present there.
>>
>> Thanks,
>> Wesley
>>
>> On Fri, Jan 16, 2015 at 10:54 AM, Eduardo <erocha.ssa at gmail.com> wrote:
>>
>>>  Hi,
>>>
>>>  I am trying to compile and use mpich-1.2.7p1 with threaded listener
>>> (i.e. configured with --enable-threaded-listener). However, I cannot even
>>> run a simple mpi example with the resulting mpich.
>>>
>>>  I need to use threaded listener because the environment I am compiling
>>> for (kind of embedded environment)  does not have fork (no heavy processes).
>>>
>>>  The error I get with the mpich with threaded listener is:
>>>
>>>  rm_2889: 1103279872:  p4_error: listener select: -1
>>>     p4_error: latest msg from perror: Bad file descriptor
>>> p0_2710: (2.097656) net_recv failed for fd = 5
>>> p0_2710: 3778266880:  p4_error: net_recv read, errno = : 104
>>>
>>>  Has anyone experienced a similar problem?
>>>
>>>  Thanks in advance,
>>> Eduardo
>>>
>>
>>
>> _______________________________________________
>> discuss mailing list     discuss at mpich.org
>> To manage subscription options or unsubscribe:
>> https://lists.mpich.org/mailman/listinfo/discuss
>>
>  _______________________________________________
> discuss mailing list     discuss at mpich.org
> To manage subscription options or unsubscribe:
> https://lists.mpich.org/mailman/listinfo/discuss
>
>
> _______________________________________________
> discuss mailing list     discuss at mpich.org
> To manage subscription options or unsubscribe:
> https://lists.mpich.org/mailman/listinfo/discuss
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20150117/818baf49/attachment.html>
-------------- next part --------------
_______________________________________________
discuss mailing list     discuss at mpich.org
To manage subscription options or unsubscribe:
https://lists.mpich.org/mailman/listinfo/discuss