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Re: Passing an array from IDL to MPI [message #28852]

Mon, 14 January 2002 06:03

Mark Rivers
Messages: 49
Registered: February 2000

Member

Miska Le Louarn <lelouarn@eso.org> wrote in message
news:3C428D26.1080405@eso.org...
> 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.

You might want to consider another solution to obtain rapid 2-D FFTs taking
advantage of multiple CPUs. This is to use the Intel Math Kernal Library
(MKL) routines. These are free, highly optimized for Intel CPUs, and take
advantage of multiple CPUs if they are present. I have written tomography
reconstruction code that is accessed via CALL_EXTERNAL from IDL, and uses
this library. The MKL speeded things up a factor of 3-4 compared to non-MKL
FFT routines. The latest version of the MKL is available for Linux as well
as Windows.

Mark Rivers

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[Message index]

		Re: Passing an array from IDL to MPI By: Mark Rivers on Mon, 14 January 2002 06:03
		Re: Passing an array from IDL to MPI By: ronn on Mon, 14 January 2002 04:18
		Re: Passing an array from IDL to MPI By: Miska Le Louarn on Mon, 21 January 2002 07:41
		Re: Passing an array from IDL to MPI By: Miska Le Louarn on Mon, 21 January 2002 07:38

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