[mpich-discuss] Fwd: The bug in handling 2D arrays

[Lu, Huiwei]

Forward to the mailing list.
—
Huiwei

Begin forwarded message:

From: Soheil Hooshdaran <shooshdaran577 at gmail.com<mailto:shooshdaran577 at gmail.com>>
Subject: Re: The bug in handling 2D arrays
Date: February 27, 2014 at 2:12:21 PM CST
To: "Lu, Huiwei" <huiweilu at mcs.anl.gov<mailto:huiweilu at mcs.anl.gov>>

Oh, ha!ha!.
sorry.Attached


On Thu, Feb 27, 2014 at 10:18 PM, Lu, Huiwei <huiweilu at mcs.anl.gov<mailto:huiweilu at mcs.anl.gov>> wrote:
Hi, Soheil, you may have forgot to attach the source file.
—
Huiwei Lu

On Feb 27, 2014, at 12:31 PM, Soheil Hooshdaran <shooshdaran577 at gmail.com<mailto:shooshdaran577 at gmail.com>> wrote:

>
> Hello.
> Please note the instruction at line 105 (the MPI_Alltoall call) and the comment on the line 108.
> You only need to  run the program once.
> The program takes 3 arguments from the command line:
> 1-How many numbers does each processor produce locally
> 2-The range bounds of numbers to produces randomly(like , say, 2 to 20, entered as 2 20)
>
> so to run, e.g, type mpirun -n 4 ./a.out 4 0 15
>
> Note that the number of processors should be a power of 2
>
> I personally think that maybe the reason for this bug is that the index and the size  of each dimension are ignored and that only the base address and the displacement is assumed.
>
> I read in Intel developer's manual that you need 4 parameters to access an element of a multi-dimensional array.  I wonder if you can apply this.




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