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Subject: Re: [OMPI users] MPI_THREAD_INIT
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2008-09-29 11:03:02


Hi George.
So is it dangerous to use hybrid program ( MPI+OpenMP) without enable
threads support?

2008/9/29 George Bosilca <bosilca_at_[hidden]>

> Gabriele,
>
> The thread support has to be explicitly requested at build time, or it will
> be disabled. Add --enable-mpi-threads (configure --help will give you more
> info) to your configure. If you plan to use threads with Open MPI I strongly
> suggest to update to the 1.3. This version is not yet released, but you can
> download the source from the nightly build section.
>
> george.
>
>
>
> On Sep 29, 2008, at 9:58 AM, Gabriele Fatigati wrote:
>
> Another question about MPI_INIT_THREAD.
>>
>> At the moment, as said, my OpenMPi version supports only level 0:
>> MPI_THREAD_SINGLE. Suppose that i have this code:
>>
>> #pragma omp barrier
>> #pragma omp master
>> MPI_Send(buf,...);
>> #pragma omp barrier
>>
>> Due my OpenMPI configuration, is it dangerous use this type of code? What
>> does it means that OpenMPI doesn't support all thread levels of
>> MPI_INIT_THREAD?
>>
>>
>> 2008/9/29 Gabriele Fatigati <g.fatigati_at_[hidden]>
>> Dear OpenMPi developers,
>> i've noted that OpenMPI 1.25 and 1.2.6 version doesn't supports thread
>> initialization function shows below:
>>
>> int MPI_Init_thread(int *argc, char *((*argv)[]), int required, int
>> *provided)
>>
>> used in hybrid programming MPI+OpenMP. Returned vales provided is 0, so
>> the unique thread level supported is MPI_THREAD_SINGLE.
>>
>> Whitch is the newest OpenMPI version that has full support for
>> MPI_THREAD_SINGLE, MPI_THREAD_FUNNELED, MPI_THREAD_SERIALIZED and
>> MPI_THREAD_MULTIPLE?
>>
>> Thanks in advance.
>>
>> --
>> Ing. Gabriele Fatigati
>>
>> CINECA Systems & Tecnologies Department
>>
>> Supercomputing Group
>>
>> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
>>
>> www.cineca.it Tel: +39 051 6171722
>>
>> g.fatigati_at_[hidden]
>>
>>
>>
>> --
>> Ing. Gabriele Fatigati
>>
>> CINECA Systems & Tecnologies Department
>>
>> Supercomputing Group
>>
>> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
>>
>> www.cineca.it Tel: +39 051 6171722
>>
>> g.fatigati_at_[hidden]
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>
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-- 
Ing. Gabriele Fatigati
CINECA Systems & Tecnologies Department
Supercomputing  Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati_at_[hidden]