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From: Corey Putkunz (coreysemail_at_[hidden])
Date: 2007-09-03 19:39:28


Hi Edgar,

Yeah I finally figured out that by MPI_2DOUBLE_COMPLEX they didn't
mean it was two doubles side my side (real and imag) to make a
complex. Once I sorted things out with MPI_DOUBLE_COMPLEX it seems to
work great. Thanks!

Corey

On 9/4/07, Edgar Gabriel <gabriel_at_[hidden]> wrote:
> you are probably using the wrong data type. MPI_2DOUBLE_COMPLEX is like
> a structure of two 'double complex' data types for MPI_MINLOC/MAXLOC
> operations in MPI_Reduce/Allreduce.
>
> You should try MPI_DOUBLE_COMPLEX. Resp, if this still doesn't work,
> compare the size of your complex data type from complex.h (e.g. using
> the sizeof operator) and the size of the MPI_DOUBLE_COMPLEX data type
> (e.g. using MPI_Type_size). If they don't match you probably need to use
> MPI_COMPLEX.
>
>
> Corey Putkunz wrote:
> > Hi everyone,
> >
> > An interesting problem I've discovered with MPI_Read_file (part of the
> > MPI I/O interface). When trying to read a 256^3 complex array (by
> > complex I mean "complex" defined in complex.h) into a single
> > dynamically allocated array (whos memory is successfully allocated).
> > To read I call:
> >
> > MPI_File_read ( file_in, data, S, MPI_2DOUBLE_COMPLEX, &status );
> >
> > (where S=256x256x256) though the call fails and I can't figure out
> > why. If I reduce the amount of data MPI_File_read attempts to read the
> > call works. I can find this issue anywhere else on the net. Please
> > help anyone!
> >
> > (System is running on an Intel machine, Fedora 7)
> >
> > Thanks. Corey
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