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@ -28,6 +28,75 @@
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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!
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!
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! File: psi_desc_index.f90
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!
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! Subroutine: psi_desc_index
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! Converts a list of data exchanges from build format to assembled format.
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! See below for a description of the formats.
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!
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! Arguments:
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! desc_a - type(psb_desc_type) The descriptor; in this context only the index
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! mapping parts are used.
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! index_in(:) - integer The index list, build format
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! index_out(:) - integer, allocatable The index list, assembled format
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! glob_idx - logical Whether the input indices are in local or global
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! numbering; the global numbering is used when
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! converting the overlap exchange lists.
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! nxch - integer The number of data exchanges on the calling process
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! nsnd - integer Total send buffer size on the calling process
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! nrcv - integer Total receive buffer size on the calling process
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!
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! The format of the index lists. Copied from base/modules/psb_desc_type
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!
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! 7. The data exchange is based on lists of local indices to be exchanged; all the
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! lists have the same format, as follows:
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! the list is composed of variable dimension blocks, one for each process to
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! communicate with; each block contains indices of local elements to be
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! exchanged. We do choose the order of communications: do not change
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! the sequence of blocks unless you know what you're doing, or you'll
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! risk a deadlock. NOTE: This is the format when the state is PSB_ASB_.
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! See below for BLD. The end-of-list is marked with a -1.
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!
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! notation stored in explanation
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! --------------- --------------------------- -----------------------------------
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! process_id index_v(p+proc_id_) identifier of process with which
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! data is exchanged.
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! n_elements_recv index_v(p+n_elem_recv_) number of elements to receive.
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! elements_recv index_v(p+elem_recv_+i) indexes of local elements to
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! receive. these are stored in the
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! array from location p+elem_recv_ to
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! location p+elem_recv_+
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! index_v(p+n_elem_recv_)-1.
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! n_elements_send index_v(p+n_elem_send_) number of elements to send.
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! elements_send index_v(p+elem_send_+i) indexes of local elements to
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! send. these are stored in the
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! array from location p+elem_send_ to
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! location p+elem_send_+
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! index_v(p+n_elem_send_)-1.
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!
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! This organization is valid for both halo and overlap indices; overlap entries
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! need to be updated to ensure that a variable at a given global index
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! (assigned to multiple processes) has the same value. The way to resolve the
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! issue is to exchange the data and then sum (or average) the values. See
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! psb_ovrl subroutine.
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!
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! 8. When the descriptor is in the BLD state the INDEX vectors contains only
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! the indices to be received, organized as a sequence
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! of entries of the form (proc,N,(lx1,lx2,...,lxn)) with owning process,
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! number of indices (most often N=1), list of local indices.
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! This is because we only know the list of halo indices to be received
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! as we go about building the sparse matrix pattern, and we want the build
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! phase to be loosely synchronized. Thus we record the indices we have to ask
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! for, and at the time we call PSB_CDASB we match all the requests to figure
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! out who should be sending what to whom.
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! However this implies that we know who owns the indices; if we are in the
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! LARGE case (as described above) this is actually only true for the OVERLAP list
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! that is filled in at CDALL time, and not for the HALO; thus the HALO list
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! is rebuilt during the CDASB process (in the psi_ldsc_pre_halo subroutine).
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!
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!
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subroutine psi_desc_index(desc,index_in,dep_list,&
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& length_dl,nsnd,nrcv,desc_index,isglob_in,info)
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use psb_descriptor_type
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@ -85,7 +154,7 @@ subroutine psi_desc_index(desc,index_in,dep_list,&
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endif
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!
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! first, find out the total sizes to be exchanged.
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! first, find out the sizes to be exchanged.
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! note: things marked here as sndbuf/rcvbuf (for mpi) corresponds to things
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! to be received/sent (in the final psblas descriptor).
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! be careful of the inversion
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@ -166,6 +235,9 @@ subroutine psi_desc_index(desc,index_in,dep_list,&
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goto 9999
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end if
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!
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! Second build the lists of requests
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!
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i = 1
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do
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if (i > ihinsz) then
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Salvatore Filippone
17 years ago