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81 lines
2.8 KiB
Fortran
81 lines
2.8 KiB
Fortran
C
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C Parallel Sparse BLAS v2.0
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C (C) Copyright 2006 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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C
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C User defined function corresponding to an HPF BLOCK partition
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C
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SUBROUTINE PART_BLOCK(GLOBAL_INDX,N,NP,PV,NV)
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IMPLICIT NONE
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INTEGER GLOBAL_INDX, N, NP
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INTEGER NV
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INTEGER PV(*)
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INTEGER DIM_BLOCK
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DOUBLE PRECISION DDIFF
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INTEGER IB1, IB2, IPV
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double precision PC
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PARAMETER (PC=0.0D0)
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DIM_BLOCK = (N + NP - 1)/NP
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NV = 1
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PV(NV) = (GLOBAL_INDX - 1) / DIM_BLOCK
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IPV = PV(1)
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IB1 = IPV * DIM_BLOCK + 1
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IB2 = (IPV+1) * DIM_BLOCK
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DDIFF = DBLE(ABS(GLOBAL_INDX-IB1))/DBLE(DIM_BLOCK)
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IF (DDIFF .LT. PC/2) THEN
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C
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C Overlap at the beginning of a block, with the previous proc
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C
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IF (IPV.GT.0) THEN
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NV = NV + 1
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PV(NV) = IPV - 1
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ENDIF
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ENDIF
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DDIFF = DBLE(ABS(GLOBAL_INDX-IB2))/DBLE(DIM_BLOCK)
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IF (DDIFF .LT. PC/2) THEN
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C
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C Overlap at the end of a block, with the next proc
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C
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IF (IPV.LT.(NP-1)) THEN
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NV = NV + 1
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PV(NV) = IPV + 1
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ENDIF
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ENDIF
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RETURN
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END
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