[Mpi-22] [mpi-forum] Error in RMA examples?

[Rolf Rabenseifner]

I'm sure that p is the number of processes in this example
and therefore dividing by p is correct, but j always without +1
(because j is a process number) and k always with +1
(because indix is starting with 1 in Fortran).

According to official Postscript version of the standard:

Page 117 lines 44-45 division by p instead of m is necessary.
Line 44 without +1, Line 45 with +1.

Page 118 line 45 with +1.
Page 120 lines 33 with +1.

About Page 117, lines 47-48, I'm not sure.

I propose to put this into MPI 2.2,
because this example should be tested before correcting it.

Best regards
Rolf

On Fri, 8 Feb 2008 12:06:26 -0300
 "Lisandro Dalcin" <dalcinl_at_[hidden]> wrote:
>Can someone take a look at the second example in:
>
>http://www.mpi-forum.org/docs/mpi-20-html/node124.htm
>
>and also to the example in:
>
>http://www.mpi-forum.org/docs/mpi-20-html/node125.htm
>
>I believe in both cases the lines saying
>
>  j = map(i)/p
>  k = MOD(map(i),p)
>
>should read
>
>  j = map(i)/m
>  k = MOD(map(i),m)
>
>
>
>Additionally, in the first example again in:
>
>http://www.mpi-forum.org/docs/mpi-20-html/node124.htm
>
>in the part where origin and target indices are computed, there are
>two lines reading:
>
>
>  oindex(total(j) + count(j)) = i
>  tindex(total(j) + count(j)) = k
>
>Should'nt it read like this (for indices being zero-based)?
>
>  oindex(total(j) + count(j)) = i  - 1
>  tindex(total(j) + count(j)) = k - 1
>
>
>Regards,
>
>-- 
>Lisandro Dalcín
>---------------
>Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
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Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden]
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . (Office: Allmandring 30)