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51 lines
1.1 KiB
FortranFixed
51 lines
1.1 KiB
FortranFixed
20 years ago
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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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