Use boundary_restrict() for boundary update on different CPUs.
- the new version reduces the data transfer between processors by a big factor when we restrict neighbors data in order to update the current block boundary; this commit implements this optimization for the blocks belonging to different processors;
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@ -596,7 +596,14 @@ module boundaries
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! allocate space for variables
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!
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allocate(rbuf(nblocks,nqt,im,jm,km))
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select case(idir)
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case(1)
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allocate(rbuf(nblocks,nqt,nd,jm,km))
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case(2)
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allocate(rbuf(nblocks,nqt,im,nd,km))
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case(3)
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allocate(rbuf(nblocks,nqt,im,jm,nd))
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end select
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! if isend == ncpu we are sending data
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!
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@ -609,7 +616,42 @@ module boundaries
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pinfo => block_array(2,irecv,isend)%ptr
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do while(associated(pinfo))
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rbuf(l,:,:,:,:) = pinfo%neigh%data%u(:,:,:,:)
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! prepare indices of the neighbor array
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!
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select case(idir)
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case(1)
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if (pinfo%side .eq. 1) then
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il = ie - nd + 1
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iu = ie
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else
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il = ib
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iu = ib + nd - 1
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end if
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rbuf(l,:,:,:,:) = pinfo%neigh%data%u(:,il:iu,:,:)
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case(2)
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if (pinfo%side .eq. 1) then
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jl = je - nd + 1
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ju = je
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else
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jl = jb
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ju = jb + nd - 1
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end if
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rbuf(l,:,:,:,:) = pinfo%neigh%data%u(:,:,jl:ju,:)
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case(3)
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if (pinfo%side .eq. 1) then
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kl = ke - nd + 1
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ku = ke
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else
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kl = kb
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ku = kb + nd - 1
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end if
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rbuf(l,:,:,:,:) = pinfo%neigh%data%u(:,:,:,kl:ku)
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end select
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pinfo => pinfo%prev
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l = l + 1
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@ -641,11 +683,25 @@ module boundaries
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iside = pinfo%side
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iface = pinfo%face
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! update boundaries
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! assign a pointer to the data structure of the current block
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!
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if (pinfo%level_difference .eq. -1) &
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call bnd_rest(pinfo%block%data, rbuf(l,:,:,:,:), idir, iside &
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, iface)
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pdata => pinfo%block%data
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! update the boundaries of the current block
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!
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select case(idir)
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case(1)
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call boundary_restrict(pdata, rbuf(l,:,:,:,:) &
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, idir, iside, iface)
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case(2)
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call boundary_restrict(pdata, rbuf(l,:,:,:,:) &
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, idir, iside, iface)
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case(3)
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call boundary_restrict(pdata, rbuf(l,:,:,:,:) &
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, idir, iside, iface)
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end select
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pinfo => pinfo%prev
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l = l + 1
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@ -655,7 +711,7 @@ module boundaries
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! deallocate buffers
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!
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deallocate(rbuf)
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if (allocated(rbuf)) deallocate(rbuf)
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! deallocate info blocks
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!
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