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Subject: Re: [OMPI devel] Intercomm Merge
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2013-09-18 10:40:55


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/
>>>>
>>>> _______________________________________________
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>>>
>>> _______________________________________________
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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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>
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