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Subject: Re: [OMPI devel] Intercomm Merge
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-09-18 10:09:58


Strange - it works fine for me on my Mac. However, I see one difference - I only run it with np=1

On Sep 18, 2013, at 2:22 AM, Jeff Squyres (jsquyres) <jsquyres_at_[hidden]> wrote:

> On Sep 18, 2013, at 9:33 AM, George Bosilca <bosilca_at_[hidden]> wrote:
>
>> 1. sm doesn't work between spawned processes. So you must have another network enabled.
>
> I know :-). I have tcp available as well (OMPI will abort if you only run with sm,self because the comm_spawn will fail with unreachable errors -- I just tested/proved this to myself).
>
>> 2. Don't use the test case attached to my email, I left an xterm based spawn and the debugging. It can't work without xterm support. Instead try using the test case from the trunk, the one committed by Ralph.
>
> I didn't see any "xterm" strings in there, but ok. :-) I ran with orte/test/mpi/intercomm_create.c, and that hangs for me as well:
>
> -----
> ❯❯❯ mpicc intercomm_create.c -o intercomm_create
> ❯❯❯ mpirun -np 4 intercomm_create
> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 4]
> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 5]
> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 6]
> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 7]
> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 4]
> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 5]
> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 6]
> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 7]
> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
> [hang]
> -----
>
> Similarly, on my Mac, it hangs with no output:
>
> -----
> ❯❯❯ mpicc intercomm_create.c -o intercomm_create
> ❯❯❯ mpirun -np 4 intercomm_create
> [hang]
> -----
>
>> George.
>>
>> On Sep 18, 2013, at 07:53 , "Jeff Squyres (jsquyres)" <jsquyres_at_[hidden]> wrote:
>>
>>> George --
>>>
>>> When I build the SVN trunk (r29201) on 64 bit linux, your attached test case hangs:
>>>
>>> -----
>>> ❯❯❯ mpicc intercomm_create.c -o intercomm_create
>>> ❯❯❯ mpirun -np 4 intercomm_create
>>> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 4]
>>> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 5]
>>> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 6]
>>> b: MPI_Intercomm_create( intra, 0, intra, MPI_COMM_NULL, 201, &inter) [rank 7]
>>> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
>>> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
>>> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
>>> a: MPI_Intercomm_create( ab_intra, 0, ac_intra, 0, 201, &inter) (0)
>>> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 4]
>>> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 5]
>>> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 6]
>>> c: MPI_Intercomm_create( MPI_COMM_WORLD, 0, intra, 0, 201, &inter) [rank 7]
>>> [hang]
>>> -----
>>>
>>> On my Mac, it hangs without printing anything:
>>>
>>> -----
>>> ❯❯❯ mpicc intercomm_create.c -o intercomm_create
>>> ❯❯❯ mpirun -np 4 intercomm_create
>>> [hang]
>>> -----
>>>
>>>
>>> On Sep 18, 2013, at 1:48 AM, George Bosilca <bosilca_at_[hidden]> wrote:
>>>
>>>> Here is a quick (and definitively not the cleanest) patch that addresses the MPI_Intercomm issue at the MPI level. It should be applied after removal of 29166.
>>>>
>>>> I also added the corrected test case stressing the corner cases by doing barriers at every inter-comm creation and doing a clean disconnect.
>>>
>>>
>>> --
>>> Jeff Squyres
>>> jsquyres_at_[hidden]
>>> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>>>
>>> _______________________________________________
>>> devel mailing list
>>> devel_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>
>> _______________________________________________
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>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>
> _______________________________________________
> devel mailing list
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> http://www.open-mpi.org/mailman/listinfo.cgi/devel