mpi_type_contiguousを定義し、後でmpi_gathervを使用することに奇妙な問題があります。タイプは次のように定義されます。
type glist
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for int version:
! integer :: iref , biref
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
real(8) :: rvar
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for buggy version:
integer :: ciref
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
end type glist
現在のコードは機能しません。コメントinteger :: cirefするとうまくいくでしょう。real(8) :: rvar代わりにコメントして、他の2つの整数のコメントを外しても、同じことが言えますinteger :: iref, biref。
つまり、間違いはデータ型のサイズの両方に依存しますが、そこにが存在する場合に限りreal(8)ます。私が1つとreal(8)2つ持っている場合int、それは再び機能します。
コードは3つのスレッド（！）で実行するように設計されています。私はそれをopenmpiとgfortran（mpif90）で実行していました。特別なコンパイルフラグや。を使用した実行はありませんmpirun -np 3 filename。誰かがmpichで実行したり、ifortでコンパイルしたり、問題がどこから来ているのかを見つけるために興味深いものをコンパイルしたりできる場合。
- - 編集 - -
Platinummonkeyは以下の使用を提案しましmpi_type_structたが、それでも機能しません。sizeof(glist)上記のようにglistを使用すると、回答として12ではなく16が返されます。
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よろしくお願いします。
完全なコードは（無視できるものもあるので心配しないでください）
module mod_glist
type glist
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for int version:
! integer :: iref , biref
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
real(8) :: rvar
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for buggy version:
integer :: ciref
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
end type glist
contains
subroutine sof_glist(sof)
implicit none
integer, intent(out) :: sof
type(glist) :: dum
integer :: val
val = 0
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for int version:
! val = kind(dum%iref) + kind(dum%biref)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
val = val + kind(dum%rvar)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for buggy version:
val = val + kind(dum%ciref)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
sof = val/kind(0)
write(*,*) 'Size in bytes, integers: ', sof, val
end subroutine
end module mod_glist
program test_mpi_gatherv
use mpi
use mod_glist
implicit none
integer :: err, np, tp, nglout, i, j, nglin, sofgl, mpi_type_glist
type(glist), dimension(:), allocatable :: gl, glcom, glsave
integer , dimension(:), allocatable :: glsize, nglinv, nglinp
integer(kind=mpi_address_kind) :: ii, ij
call mpi_init(err)
call mpi_comm_size(mpi_comm_world, np, err)
call mpi_comm_rank(mpi_comm_world, tp, err)
tp = tp + 1
call sof_glist(sofgl)
call mpi_type_contiguous(sofgl, mpi_integer, mpi_type_glist, err)
call mpi_type_commit(mpi_type_glist, err)
call mpi_type_get_extent(mpi_type_glist, ii, ij, err)
write(*,*) 'extend: ', ii, ij
allocate(glsize(np), nglinv(np), nglinp(np))
glsize(1) = 5
glsize(2) = 4
glsize(3) = 3
glsize(4:np) = 0
allocate(gl(glsize(tp)))
j = 1
do i = 1,tp-1
j = j+glsize(i)
enddo
do i = 1,glsize(tp)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for int version:
! gl(i)%iref = j
! gl(i)%biref = -j
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
gl(i)%rvar = real(j,8)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!uncomment line below for buggy version:
gl(i)%ciref = -j*10
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
j = j+1
enddo
do i=1,np ! setting up stuff can be ignored
if(i.eq.1)then
if(tp.eq.i)then
nglinv(1) = 0
nglinv(2) = 2
nglinv(3) = 3
nglinp(1) = 0
nglinp(2) = nglinv(1) + nglinp(1)
nglinp(3) = nglinv(2) + nglinp(2)
nglin = nglinv(1) + nglinv(2) + nglinv(3)
allocate(glcom(nglin))
nglout = 0
else
if(tp.eq.2)then
nglout = 2
allocate(glcom(nglout))
glcom(1) = gl(1)
glcom(2) = gl(3)
elseif(tp.eq.3)then
nglout = 3
allocate(glcom(nglout))
glcom(1) = gl(1)
glcom(2) = gl(2)
glcom(3) = gl(3)
endif
endif
elseif(i.eq.2)then
if(tp.eq.i)then
nglinv(1) = 3
nglinv(2) = 0
nglinv(3) = 2
nglinp(1) = 0
nglinp(2) = nglinv(1) + nglinp(1)
nglinp(3) = nglinv(2) + nglinp(2)
nglin = nglinv(1) + nglinv(2) + nglinv(3)
allocate(glcom(nglin))
nglout = 0
else
if(tp.eq.1)then
nglout = 3
allocate(glcom(nglout))
glcom(1) = gl(2)
glcom(2) = gl(4)
glcom(3) = gl(5)
elseif(tp.eq.3)then
nglout = 2
allocate(glcom(nglout))
glcom(1) = gl(2)
glcom(2) = gl(3)
endif
endif
elseif(i.eq.3)then
if(tp.eq.i)then
nglinv(1) = 0
nglinv(2) = 2
nglinv(3) = 0
nglinp(1) = 0
nglinp(2) = nglinv(1) + nglinp(1)
nglinp(3) = nglinv(2) + nglinp(2)
nglin = nglinv(1) + nglinv(2) + nglinv(3)
allocate(glcom(nglin))
nglout = 0
else
if(tp.eq.1)then
nglout = 0
allocate(glcom(nglout))
elseif(tp.eq.2)then
nglout = 2
allocate(glcom(nglout))
glcom(1) = gl(1)
glcom(2) = gl(4)
endif
endif
endif ! end of setting up stuff
if(i.eq.tp) allocate(glsave(nglin))
! debug output
call mpi_barrier(mpi_comm_world, err)
write(*,*) i, tp, nglout, nglin
call mpi_barrier(mpi_comm_world, err)
if(i.eq.tp) write(*,*) i, nglinv, nglinp
call mpi_barrier(mpi_comm_world, err)
! end debug output
call mpi_gatherv(glcom, nglout, mpi_type_glist, glsave, nglinv, nglinp, mpi_type_glist, i-1, mpi_comm_world, err)
if(allocated(glcom)) deallocate(glcom)
enddo
! debug output
call mpi_barrier(mpi_comm_world, err)
do i = 1,nglin
write(*,*) tp, i, glsave(i)
enddo
! end debug output
call mpi_finalize(err)
end program