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C
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C Parallel Sparse BLAS version 2.2
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C (C) Copyright 2006/2007/2008
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C Salvatore Filippone University of Rome Tor Vergata
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C Alfredo Buttari University of Rome Tor Vergata
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C
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C Redistribution and use in source and binary forms, with or without
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C modification, are permitted provided that the following conditions
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C are met:
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C 1. Redistributions of source code must retain the above copyright
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C notice, this list of conditions and the following disclaimer.
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C 2. Redistributions in binary form must reproduce the above copyright
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C notice, this list of conditions, and the following disclaimer in the
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C documentation and/or other materials provided with the distribution.
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C 3. The name of the PSBLAS group or the names of its contributors may
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C not be used to endorse or promote products derived from this
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C software without specific written permission.
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C
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C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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C POSSIBILITY OF SUCH DAMAGE.
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C
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C
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***********************************************************************
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* *
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* The communication step among processors at each *
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* matrix-vector product is a variable all-to-all *
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* collective communication that we reimplement *
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* in terms of point-to-point communications. *
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* The data in input is a list of dependencies: *
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* for each node a list of all the nodes it has to *
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* communicate with. The lists are guaranteed to be *
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* symmetric, i.e. for each pair (I,J) there is a *
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* pair (J,I). The idea is to organize the ordering *
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* so that at each communication step as many *
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* processors as possible are communicating at the *
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* same time, i.e. a step is defined by the fact *
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* that all edges (I,J) in it have no common node. *
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* *
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* Formulation of the problem is: *
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* Given an undirected graph (forest): *
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* Find the shortest series of steps to cancel all *
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* graph edges, where at each step all edges belonging *
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* to a matching in the graph are canceled. *
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* *
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* An obvious lower bound to the optimum number of steps *
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* is the largest degree of any node in the graph. *
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* *
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* The algorithm proceeds as follows: *
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* 1. Build a list of all edges, e.g. copy the *
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* dependencies lists keeping only (I,J) with I<J *
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* 2. Compute an auxiliary vector with the degree of *
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* each node of the graph. *
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* 3. While there are edges in the graph do: *
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* 4. Weight the edges with the sum of the degrees *
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* of their nodes and sort them into descending order *
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* 5. Scan the list of edges; if neither node of the *
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* edge has been marked yet, cancel the edge and mark *
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* the two nodes *
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* 6. If no edge was chosen but the graph is nonempty *
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* raise an error condition *
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* 7. Queue the edges in the matchin to the output *
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* sequence; *
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* 8. Decrease by 1 the degree of all marked nodes, *
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* then clear all marks *
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* 9. Cycle to 3. *
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* 10. For each node: scan the edge sequence; if an *
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* edge has the node as an endpoint, queue the other *
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* node in the dependency list for the current one *
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* *
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***********************************************************************
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SUBROUTINE SRTLIST(DEP_LIST,DL_LDA,LDL,NP,dg,dgp,upd,
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+ edges,idx,ich,INFO)
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use psb_serial_mod
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IMPLICIT NONE
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INTEGER NP, DL_LDA, INFO
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INTEGER DEP_LIST(DL_LDA,*), LDL(*),DG(*), DGP(*), IDX(*),
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+ UPD(*),EDGES(2,*),ICH(*)
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INTEGER I,J, NEDGES,IP1,IP2,NCH,IP,IEDGE,I1,IX,IST,ISWAP(2)
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INTEGER NO_COMM
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PARAMETER (NO_COMM=-1)
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IF (NP .LT. 0) THEN
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INFO = 1
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RETURN
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ENDIF
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C
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C dg contains number of communications
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C
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DO I=1, NP
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DG(I)=LDL(I)
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ENDDO
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NEDGES = 0
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DO I=1, NP
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DO J=1, DG(I)
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IP = DEP_LIST(J,I) + 1
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c$$$ write(psb_err_unit,*)
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c$$$ 'SRTLIST Input :',i,ip
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IF (IP.GT.I)
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+ NEDGES = NEDGES + 1
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ENDDO
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ENDDO
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IEDGE = 0
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DO I=1, NP
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DO J=1, DG(I)
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IP = DEP_LIST(J,I) + 1
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IF (IP.GT.I) THEN
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IEDGE = IEDGE + 1
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EDGES(1,IEDGE) = I
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EDGES(2,IEDGE) = IP
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ENDIF
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ENDDO
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ENDDO
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IST = 1
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DO WHILE (IST.LE.NEDGES)
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DO I=1, NP
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UPD(I) = 0
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ENDDO
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DO I=IST, NEDGES
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DGP(I) = -(DG(EDGES(1,I))+DG(EDGES(2,I)))
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ENDDO
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call psb_msort(dgp(ist:nedges),ix=idx(ist:nedges))
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I1 = IST
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NCH = 0
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DO I = IST, NEDGES
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IX = IDX(I)+IST-1
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IP1 = EDGES(1,IX)
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IP2 = EDGES(2,IX)
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IF ((UPD(IP1).eq.0).AND.(UPD(IP2).eq.0)) THEN
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UPD(IP1) = -1
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UPD(IP2) = -1
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NCH = NCH + 1
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ICH(NCH) = IX
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ENDIF
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ENDDO
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IF (NCH.eq.0) THEN
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write(psb_err_unit,*)
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+ 'SRTLIST ?????? Impossible error !!!!!?????',
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+ nedges,ist
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do i=ist, nedges
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IX = IDX(I)+IST-1
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write(psb_err_unit,*)
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+ 'SRTLIST: Edge:',ix,edges(1,ix),
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+ edges(2,ix),dgp(ix)
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enddo
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info = psb_err_input_value_invalid_i_
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return
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ENDIF
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call psb_msort(ich(1:nch))
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DO I=1, NCH
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ISWAP(1) = EDGES(1,IST)
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ISWAP(2) = EDGES(2,IST)
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EDGES(1,IST) = EDGES(1,ICH(I))
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EDGES(2,IST) = EDGES(2,ICH(I))
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EDGES(1,ICH(I)) = ISWAP(1)
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EDGES(2,ICH(I)) = ISWAP(2)
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IST = IST + 1
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ENDDO
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DO I=1, NP
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DG(I) = DG(I) + UPD(I)
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ENDDO
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ENDDO
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DO I=1, NP
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IF (DG(I).NE.0) THEN
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write(psb_err_unit,*)
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+ 'SRTLIST Error on exit:',i,dg(i)
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ENDIF
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DG(I) = 0
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ENDDO
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DO J=1,NEDGES
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I = EDGES(1,J)
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DG(I) = DG(I)+1
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DEP_LIST(DG(I),I) = EDGES(2,J)-1
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I = EDGES(2,J)
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DG(I) = DG(I)+1
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DEP_LIST(DG(I),I) = EDGES(1,J)-1
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ENDDO
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DO I=1, NP
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IF (DG(I).NE.LDL(I)) THEN
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write(psb_err_unit,*)
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+ 'SRTLIST Mismatch on output',i,dg(i),ldl(i)
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ENDIF
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ENDDO
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c$$$ write(psb_err_unit,*)
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c$$$ 'Output communication:',t2-t1
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c$$$ do i=1,np
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c$$$ do j=1,ldl(i)
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c$$$ write(psb_err_unit,*)
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c$$$ 'SRTLIST', i,dep_list(j,i)+1
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c$$$ enddo
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c$$$ enddo
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RETURN
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END
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