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Subject: Re: [OMPI users] MPI_Allreduce with F90 Handles
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-11-30 15:59:28


On Nov 30, 2012, at 2:04 PM, Shane Hart wrote:

> I've attached a small sample program that demonstrates the problem. You can toggle working/non-working behaviour by toggling commenting on line 27.

Thanks! I got swamped this week, but I'll try to look at it next week (although with the Forum meeting next week, it might have to wait until the week after :-( ).

> I've tried to open a bug report, but the system isn't letting me register for Trac:
>
> Trac detected an internal error:
> KeyError: 'recaptcha_challenge_field'

Weird. I've forwarded this on to our sysadmin to see what's going on there.

I'll file a ticket and CC you.

>
> Shane
>
> On Friday, November 30, 2012 10:35:57 AM users-request_at_[hidden] wrote:
> All,
>
> I have a Fortran code that works quite well with OpenMPI 1.4.3 where I create a handle using:
>
> call MPI_TYPE_CREATE_F90_INTEGER(9, COMM_INT4, ierror)
>
> and then do a reduction with:
>
> call MPI_ALLREDUCE(send_buffer, buffer, count, COMM_INT4, MPI_SUM, communicator, ierror)
>
> However, this fails with OpenMPI 1.6.3 stating:
>
> An error occurred in MPI_Allreduce: the reduction operation MPI_SUM is not defined for non-intrinsic datatypes (attempted with datatype named "Dup MPI_INT")
>
> The MPI standard states that MPI_SUM works with Fortran integers, and Fortran integers are defined in Section 5.9.2 as:
>
> MPI_INTEGER, MPI_AINT, MPI_OFFSET,
> *and handles returned from
> MPI_TYPE_CREATE_F90_INTEGER*,
> and if available: MPI_INTEGER1,
> MPI_INTEGER2, MPI_INTEGER4,
> MPI_INTEGER8, MPI_INTEGER16
>
> (emphasis mine)
>
> However the manual page on MPI_Reduce for OpenMPI only states that Fortran integers are:
>
> Fortran integer: MPI_INTEGER
> Does OpenMPI not support using MPI_SUM with Fortran integer handles? I'm hoping that it's just an oversight as it used to work...
>
> System: Fedora 17
> Compilers: GCC 4.7.2
> OpenMPI's tested: 1.4.3 (works), 1.5.4 (doesn't work), 1.6.3 (doesn't work)
>
> Thanks for any insight,
> Shane
> <mpi_sum.f90>_______________________________________________
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> users_at_[hidden]
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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