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Passing an array from IDL to MPI [message #28858]

Sun, 13 January 2002 23:47

Miska Le Louarn
Messages: 8
Registered: December 1995

Junior Member

Hi all IDL / parallel computing experts !

I am trying to integrate a piece of MPI-code written in C into my IDL
program.
I have a cube of data produced in the IDL code, which needs to be
Fourier transformed. So I want to write a little MPI program (in C)
which uses several CPUs to compute the FFT of each plane in the cube.
My problem is that I need to pass the data cube to the MPI program. This
would not a problem with a plain C program (a simple call_external would
do the trick), but MPI likes to be lauched with the "mpirun" command
which initializes all the parallel stuff.

Any ideas ?
Of course I could write the data cube to a file from IDL. I could then
spawn the mpirun process from IDL and have the MPI code read the file.
But I think there is a significant loss of time doing that. Plus it's
not very elegant...

I hope someone has an idea...

Thanks in advance !

Miska

PS: I am using MPICH under Linux. The C code uses FFTW.

--
* Miska Le Louarn Phone: (49) 89 320 06 908 *
* European Southern Observatory FAX : (49) 89 320 23 62 *
* Karl Schwarzschild Str. 2 e-mail: lelouarn@eso.org *
* D-85748 Garching http://www.eso.org/~lelouarn *
* Germany
*

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[Message index]

		Passing an array from IDL to MPI By: Miska Le Louarn on Sun, 13 January 2002 23:47
		Re: Passing an array from IDL to MPI By: ronn on Mon, 21 January 2002 15:05
		Re: Passing an array from IDL to MPI By: bruhwile on Sun, 27 January 2002 20:03

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