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Subject: Re: [OMPI users] Bug in MPI_scatterv Fortran-90 implementation
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-04-22 06:18:41


Oops! Missed that; thanks.

I've committed the change to the trunk and filed CMRs to bring the fix to v1.4 and v1.5.

Thanks for reporting the issue.

On Apr 22, 2011, at 1:03 AM, Stanislav Sazykin wrote:

> Jeff,
>
> No, the patch did not solve the problem. Looking more,
> there is another place where the interfaces come up, in
> mpi-f90-interfaces.h.sh in ompi/mpi/f90/scripts
>
> If I manually change the two arguments to arrays from scalars
> in both scripts after running configure but before "make",
> then it works.
>
> Stan Sazykin
>
>
> On 4/21/2011 11:07, Jeff Squyres wrote:
>> I do believe you found a bona-fide bug.
>>
>> Could you try the attached patch? (I think it should only affect f90 "large" builds) You should be able to check it quickly via:
>>
>> cd top_of_ompi_source_tree
>> patch -p0< scatterv-f90.patch
>> cd ompi/mpi/f90
>> make clean
>> rm mpi_scatterv_f90.f90
>> make all install
>>
>>
>>
>> On Apr 21, 2011, at 10:37 AM, Stanislav Sazykin wrote:
>>
>>> Hello,
>>>
>>> I came across what appears to be an error in implementation of
>>> MPI_scatterv Fortran-90 version. I am using OpenMPI 1.4.3 on Linux.
>>> This comes up when OpenMPI was configured with
>>> --with-mpi-f90-size=medium or --with-mpi-f90-size=large
>>>
>>> The standard specifies that the interface is
>>> MPI_SCATTERV(SENDBUF, SENDCOUNTS, DISPLS, SENDTYPE, RECVBUF,
>>> RECVCOUNT, RECVTYPE, ROOT, COMM, IERROR)
>>> <type> SENDBUF(*), RECVBUF(*)
>>> INTEGER SENDCOUNTS(*), DISPLS(*), SENDTYPE
>>>
>>> so that SENDCOUNTS and DISPLS are integer arrays. However, if
>>> I compile a fortran code with calls to MPI_scatterv and compile
>>> with argument checks, two Fortran compilers (Intel and Lahey)
>>> produce fatal errors saying there is no matching interface.
>>>
>>> Looking in the source code of OpenMPI, I see that in
>>> ompi/mpi/f90/scripts, the script mpi_scatterv_f90.f90.sh that
>>> is invoked when running "make" produces Fortran interfaces
>>> that list both SENDCOUNTS and DISPLS as
>>>
>>> integer, intent(in) ::
>>>
>>> This appears to be an error as it would be illegal to pass a scalar
>>> variable and receive it as an array in the subroutine. I have not
>>> figured out what happens in the code at this invocation (the code
>>> is complicated), but seems like a segfault situation.
>>>
>>> --
>>> Stan Sazykin
>>> _______________________________________________
>>> users mailing list
>>> users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>>
>>
>>
>> _______________________________________________
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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