[mpich-discuss] Reading files in parallel in winxp with mpich2

[Jayesh Krishna]

Hi,
 Please go through MPI-IO (http://www.mcs.anl.gov/research/projects/mpi/mpi-standard/mpi-report-2.0/node172.htm#Node172) for more information.

Regards,
Jayesh

----- Original Message -----
From: "TAY wee-beng" <zonexo at gmail.com>
To: "Jayesh Krishna" <jayesh at mcs.anl.gov>
Sent: Monday, August 22, 2011 4:58:36 PM
Subject: Re: [mpich-discuss] Reading files in parallel in winxp with mpich2

Hi Jayesh,

I want all the processors to read a file using:

open (unit = 1 , FILE = "body.txt" , status = "old", iostat = status(1))

read (1,fmt=*) no_body_pts

...



Is this why it can't work?

I tried using :

call 
MPI_File_open(MPI_COMM_WORLD,"body.txt",MPI_MODE_RDONLY,MPI_INFO_NULL,fh,ierr)

But I am not sure how each process can read the contents in the file 
after that?

Do I use MPI_File_read? I am not sure of the syntax.

Can you help?

Thanks alot!

Yours sincerely,

TAY wee-beng


On 22/8/2011 6:15 PM, Jayesh Krishna wrote:
> Hi,
>   Are you using MPI-IO (MPI_File_open()...)? You should make sure that all MPI processes have access to the file (MPICH2 on Windows does not perform automatic file staging).
>
> Regards,
> Jayesh
>
> ----- Original Message -----
> From: "TAY wee-beng"<zonexo at gmail.com>
> To: mpich-discuss at mcs.anl.gov
> Sent: Thursday, August 18, 2011 1:57:09 PM
> Subject: [mpich-discuss] Reading files in parallel in winxp with mpich2
>
> Hi,
>
> I am running winxp under virtualbox.
>
> I managed to run my mpi code compiled using compaq visual fortran in winxp.
>
> I run it with wmpiexec with 1-8 processors and it worked fine.
>
> However when my mpi code requires reading in of files, it worked only if
> I use 1 processor.
>
> For more than 1 processor, I got the file not found error.
>
> How can I solved this error? Btw, when using wmpiconfig, I only get 1 host.
>
> Thank you very much!
>
> Yours sincerely,
>
> TAY wee-beng
>
>
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