I've done a lot of Fortran90 MPI AllGather's with
1D arrays and I understand that.
Is an allgather possible to give every node a complete
copy of this 2D array that is spread out over all the nodes???
Node Number What part of array "a" it has
=================================================
0 a(1,1), a(1,2), a(1,3) (i.e. a(1,1-3))
1 a(2,1), a(2,2), a(2,3) (i.e. a(2,1-3))
2 a(3,1), a(3,2), a(3,3) (i.e. a(3,1-3))
3 a(4,1), a(4,2), a(4,3) (i.e. a(4,1-3))
4 a(1,4), a(1,5), a(1,6) (i.e. a(1,4-6))
5 a(2,4), a(2,5), a(2,6) (i.e. a(2,4-6))
6 a(3,4), a(3,5), a(3,6) (i.e. a(3,4-6))
7 a(4,4), a(4,5), a(4,6) (i.e. a(4,4-6))
I've heard about column-major order and row-major order
but always forget which one is C and which one Fortran90
uses.
I could switch order of indices on a if it would help.
Any help would be greatly appreciated.
Sincerely,
Chris
_______________________________________
Christian Seberino, Ph.D.
SPAWAR Systems Center San Diego
Code 2872
49258 Mills Street, Room 158
San Diego, CA 92152-5385
U.S.A.
Phone: (619) 553-9973
Fax : (619) 553-6521
Email: seberino_at_[hidden]
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