Tuan
Joined: 11 Jun 2009
Posts: 226
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 Posted: Wed Feb 17, 2010 5:36 pm Post subject: traversing array |
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I know that Fortran store array in column-major while C store array in row-major. So, with the current implementation of CUDA Fortran, as I may call C CUDA to do the computation, I'm not sure if between the two following code (one access row-based, and one use column-based), basically, which one should work faster with CUDA Fortran (given that M, N big enough)
| Code: | real, device, dimension(M, N) :: Ab
attributes(global) subroutine dosomething()
do i =1, M
do j = 1,N
A(i,j) = A(i,j) * (i+j)
endo
enddo
end subroutine |
| Code: | real, device, dimension(M, N) :: Ab
attributes(global) subroutine dosomething()
do j =1, N
do i = 1,M
A(i,j)=A(i,j) * (i+j)
endo
enddo
end subroutine |
Thanks,
Tuan. |
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