[MPICH] Re: Problems with allreduce

[Luiz Mendes]

Hi all, Rajeev

I correct this, and i made some simplifications, and the problems appears to
be caused by the fact of i add double variable declarations.

It is very strange. Some light to this?

Thanks
Luiz

2007/1/23, Rajeev Thakur <thakur at mcs.anl.gov>:
>
>  Where have you allocated space for arquivo_nome?
>
> Rajeev
>
>  ------------------------------
> *From:* owner-mpich-discuss at mcs.anl.gov [mailto:
> owner-mpich-discuss at mcs.anl.gov] *On Behalf Of *Luiz Mendes
> *Sent:* Tuesday, January 23, 2007 5:05 PM
> *To:* mpich-discuss
> *Subject:* [MPICH] Re: Problems with allreduce
>
> Discard variable "tempo", without this continue getting error.
>
> thanks
>
> 2007/1/23, Luiz Mendes <luizmendesw at gmail.com>:
> >
> > Hi all, i am with a problem in operation MPI_Allreduce.
> >
> > The code is the following below:
> >
> > int main(int argc, char *argv[])
> > {
> >     int opcao, dimensao,nome_tamanho, processo, num_procs;
> >     int coluna, contador_bytes, contador_bytes_parcial, interacao,
> > contador_total_bytes;
> >     char  *palavra = NULL, *arquivo_nome;
> >         char *arquivo_pv;
> >     char procname[MPI_MAX_PROCESSOR_NAME];
> >     double inicio, termino, tempo_parcial, soma_tempo_total, valor;
> >     long long offset;
> >     MPI_Datatype linhaMatriz;
> >     MPI_File arquivo;
> >     MPI_Status status;
> >
> >     MPI_Init(&argc, &argv);
> >     MPI_Comm_rank(MPI_COMM_WORLD, &processo);
> >     MPI_Comm_size(MPI_COMM_WORLD, &num_procs);
> >     MPI_Get_processor_name(procname,&nome_tamanho);
> >
> >     while ((opcao = getopt(argc, argv, "A:D:P:h")) != EOF)
> >     {
> >         switch(opcao)
> >         {
> >             case 'A':
> >                 arquivo_pv =optarg;
> >                 sprintf(arquivo_nome,"%s",arquivo_pv);
> >                 break;
> >             case 'D':
> >                 sscanf (optarg, "%d", &dimensao);
> >                 break;
> >             case 'P':
> >                 sprintf(arquivo_nome,"pvfs2:/mnt/pvfs2/%s",arquivo_pv);
> >         }
> >     }
> >
> >
> >     MPI_Type_contiguous(dimensao,MPI_DOUBLE,&linhaMatriz);
> >     MPI_Type_commit(&linhaMatriz);
> >
> >     MPI_File_open(MPI_COMM_WORLD, arquivo_nome, MPI_MODE_CREATE |
> > MPI_MODE_WRONLY, MPI_INFO_NULL, &arquivo);
> >
> >     for(interacao=0; interacao<(dimensao/num_procs);interacao++)
> >     {
> >         double matrizlocal[dimensao];
> >         valor=processo*(dimensao/num_procs)*dimensao+interacao*dimensao;
> >
> >         offset=valor*sizeof(double);
> >         for(coluna=0; coluna<dimensao; coluna++)
> >         {
> >             matrizlocal[coluna]=valor+coluna;
> >         }
> >
> >         MPI_File_set_view(arquivo, offset, MPI_DOUBLE, linhaMatriz,
> > "native", MPI_INFO_NULL);
> >         inicio=MPI_Wtime();
> >         MPI_File_write(arquivo, matrizlocal, 1, linhaMatriz, &status);
> >         termino=MPI_Wtime();
> >         tempo_parcial=termino-inicio;
> >         contador_bytes_parcial+=sizeof(matrizlocal);
> >         soma_tempo_total+=tempo_parcial;
> >     }
> >     MPI_File_close(&arquivo);
> >     MPI_Allreduce(&soma_tempo_total, &tempo, dimensao, MPI_DOUBLE,
> > MPI_MAX,MPI_COMM_WORLD);
> >     MPI_Finalize();
> > .......
> >
> >
> > Do you know what could be happening?
> >
> > Thanks
> >
> > Luiz Mendes
> >
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20070123/2e491754/attachment.htm>