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Subject: Re: [OMPI devel] Intercomm Merge
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-09-18 12:52:05


Thanks George - much appreciated

On Sep 18, 2013, at 9:49 AM, George Bosilca <bosilca_at_[hidden]> wrote:

> The test case was broken. I just pushed a fix.
>
> George.
>
> On Sep 18, 2013, at 16:49 , Ralph Castain <rhc_at_[hidden]> wrote:
>
>> Hangs with any np > 1
>>
>> However, I'm not sure if that's an issue with the test vs the underlying implementation
>>
>> On Sep 18, 2013, at 7:40 AM, "Jeff Squyres (jsquyres)" <jsquyres_at_[hidden]> wrote:
>>
>>> Does it hang when you run with -np 4?
>>>
>>> Sent from my phone. No type good.
>>>
>>> On Sep 18, 2013, at 4:10 PM, "Ralph Castain" <rhc_at_[hidden]> wrote:
>>>
>>>> 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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>>>>>
>>>>>
>>>>> --
>>>>> Jeff Squyres
>>>>> jsquyres_at_[hidden]
>>>>> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>>>>>
>>>>> _______________________________________________
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>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>>>
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