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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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SUBROUTINE PARTITION(M, WORK, IA, N_BLOCK)
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use psb_const_mod
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use psb_spmat_type
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IMPLICIT NONE
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C ...Scalar arguments...
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INTEGER M, N_BLOCK
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C ...Array arguments...
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INTEGER IA(3,*), WORK(*)
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C ...Local scalars...
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INTEGER I, NNZ_ROW, N_ROWS, N_ROWS_EQ, BLOCK
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I = 1
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N_ROWS = 0
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BLOCK = 2
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WORK(M+1) = 1
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IA(1,1) = 1
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DO WHILE(.TRUE.)
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IF (N_ROWS.GT.PSB_MAXJDROWS_) THEN
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IA(1,BLOCK) = IA(1,BLOCK-1)+PSB_MAXJDROWS_
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N_ROWS = N_ROWS-PSB_MAXJDROWS_
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BLOCK = BLOCK+1
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ELSE IF (N_ROWS.GE.PSB_MINJDROWS_) THEN
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IA(1,BLOCK) = IA(1,BLOCK-1)+N_ROWS
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N_ROWS = 0
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BLOCK = BLOCK+1
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ELSE IF (I.LE.M) THEN
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N_ROWS_EQ = 0
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NNZ_ROW = -WORK(I)
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DO WHILE (NNZ_ROW.EQ.-WORK(I))
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N_ROWS_EQ = N_ROWS_EQ+1
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I=I+1
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ENDDO
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N_ROWS = N_ROWS + N_ROWS_EQ
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ELSE IF (N_ROWS.NE.0) THEN ! (I.GT.M)
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IA(1,BLOCK) = IA(1,BLOCK-1)+N_ROWS
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BLOCK = BLOCK+1
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GOTO 998
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ELSE
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GOTO 998
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ENDIF
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ENDDO
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998 CONTINUE
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N_BLOCK = BLOCK - 2
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if (ia(1,n_block+1)-1 .ne. m) then
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write(0,*) 'PARTITION: Something wrong',m,
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+ n_block,ia(1,n_block+1),ia(1,n_block)
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endif
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END
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