Hi Diego,
displacements start at 0, so 0 means no displacement, i.e., the
corresponding data starts at the first entry (by default 1 in Fortran)
of the receive field. A displacement of 1 would point to entry number 2.
Btw., MPI does not care how you allocate your fields in Fortran. E.g.,
if you do an
allocate(A(-1:10))
the lower and upper bounds are only known to Fortran. You just pass an
pointer to this field to MPI and declare that it contains size(A)=12
entries. All displacements are relative to the first entry of that
field, so a displacement of 0 points to A(-1), a displacement of 1 to
A(0) and so on.
Best
Georg
Am 14.10.2015 um 16:50 schrieb Diego Avesani:
dear George, dear all,
thanks for the suggestions, it works now.
I have just put:
IDNodeStartGLOBAL = IDNodeStartGLOBAL -1
but I do not understand why. Can you explain it to me?
Thanks
Diego
On 14 October 2015 at 16:02, Georg Geiser <georg.gei...@dlr.de
<mailto:georg.gei...@dlr.de>> wrote:
Diego,
try to decrease your displacements by one.
Best
Georg
Am 14.10.2015 um 15:51 schrieb Diego Avesani:
dear all,
I have some problem with MPI_GATHERV.
In my code I generate a complex number
DO ij=iNS,iNE
X11(ij) = cmplx(1.,0.)
ENDDO
where iNS,INE change according to the CPU rank, in may case
cpu 0 1 10050
cpu 1 10051 20100
cpu 2 20101 30150
cpu 3 30151 40401
according to that I have
nNodeGLOBAL = 10050 10050 10050 10251
IDNodeStartGLOBAL = 1 10051 20101 30151
After that I apply a MPI_GATHERV as
CALL MPI_GATHERV(X11(*iNS:iNE*),MPIdata%nNodes,
mpi_double_cpmplex, *PHIH*,
nNodeGLOBAL,IDNodeStartGLOBAL, mpi_double_cpmplex, 0,
MPI_COMM_WORLD, Err)
but when I plot REAL(PHIH(1)), I get
0
I use fortran, do you think that there is an error in
nNodeGLOBAL? do I have to allocate the vector nNodeGLOBAL and
IDNodeStartGLOBAL satrting from 0 according to the name of the rank?
really really
thanks a lot
Diego
_______________________________________________
users mailing list
us...@open-mpi.org <mailto:us...@open-mpi.org>
Subscription:http://www.open-mpi.org/mailman/listinfo.cgi/users
Link to this
post:http://www.open-mpi.org/community/lists/users/2015/10/27862.php
_______________________________________________
users mailing list
us...@open-mpi.org <mailto:us...@open-mpi.org>
Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users
Link to this post:
http://www.open-mpi.org/community/lists/users/2015/10/27863.php
_______________________________________________
users mailing list
us...@open-mpi.org
Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users
Link to this post:
http://www.open-mpi.org/community/lists/users/2015/10/27864.php
