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579 lines
17 KiB
Fortran
579 lines
17 KiB
Fortran
!
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! Parallel Sparse BLAS version 3.5
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! (C) Copyright 2006-2018
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! Salvatore Filippone
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! Alfredo Buttari
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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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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module psb_hash_mod
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use psb_const_mod
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use psb_desc_const_mod
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use psb_cbind_const_mod
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!> \class psb_hash_mod
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!! \brief Simple hash module for storing integer keys.
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!!
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!! This module implements a very simple minded hash table.
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!! The hash is based on the idea of open addressing with double hashing;
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!! the primary hash function h1(K) is simply the remainder modulo 2^N, while
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!! the secondary hash function is 1 if H1(k) == 0, otherwise IOR((2^N-H1(k)),1)
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!! (See Knuth: TAOCP, Vol. 3, sec. 6.4)
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!!
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!! These hash functions are not very smart; however they are very simple and fast.
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!! The intended usage of this hash table is to store indices of halo points, which
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!! are supposed to be few compared to the internal indices
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!! (which are stored elsewhere).
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!! Therefore, either the table has a very low occupancy, and this scheme will work,
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!! or we have lots more to worry about in parallel performance than the efficiency
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!! of this hashing scheme.
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!!
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!!
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! For us a hash is a Nx2 table.
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! Note: we are assuming that the keys are positive numbers.
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! Allocatable scalars would be a nice solution...
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!
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type psb_hash_type
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integer(psb_ipk_) :: nbits, hsize, hmask, nk
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integer(psb_lpk_), allocatable :: table(:,:)
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integer(psb_lpk_) :: nsrch, nacc
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end type psb_hash_type
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integer(psb_ipk_), parameter :: HashDuplicate = 123, HashOK=0, HashOutOfMemory=-512,&
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& HashFreeEntry = -1, HashNotFound = -256
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interface psb_hashval
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#if defined(IPK4)
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function psb_c_hashval_32(key) bind(c) result(res)
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import psb_c_ipk_
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implicit none
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integer(psb_c_ipk_), value :: key
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integer(psb_c_ipk_) :: res
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end function psb_c_hashval_32
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#endif
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#if defined(IPK4) && defined(LPK8)
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function psb_c_hashval_64_32(key) bind(c) result(res)
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import psb_c_ipk_, psb_c_lpk_
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implicit none
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integer(psb_c_lpk_), value :: key
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integer(psb_c_ipk_) :: res
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end function psb_c_hashval_64_32
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#endif
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#if defined(IPK8)
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function psb_c_hashval_64(key) bind(c) result(res)
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import psb_c_ipk_
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implicit none
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integer(psb_c_ipk_), value :: key
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integer(psb_c_ipk_) :: res
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end function psb_c_hashval_64
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#endif
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end interface psb_hashval
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interface psb_hash_init
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module procedure psb_hash_init_lv, psb_hash_init_ln
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end interface psb_hash_init
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interface psb_sizeof
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module procedure psb_sizeof_hash_type
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end interface
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interface psb_hash_searchinskey
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module procedure psb_hash_lsearchinskey
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end interface psb_hash_searchinskey
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interface psb_hash_searchkey
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module procedure psb_hash_lsearchkey
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end interface psb_hash_searchkey
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#if defined(IPK4) && defined(LPK8)
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interface psb_hash_init
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module procedure psb_hash_init_v, psb_hash_init_n
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end interface
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interface psb_hash_searchinskey
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module procedure psb_hash_isearchinskey
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end interface psb_hash_searchinskey
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interface psb_hash_searchkey
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module procedure psb_hash_isearchkey
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end interface psb_hash_searchkey
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#endif
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interface psb_move_alloc
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module procedure HashTransfer
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end interface
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interface psb_hash_copy
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module procedure HashCopy
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end interface
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interface psb_free
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module procedure HashFree
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end interface
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contains
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function psb_Sizeof_hash_type(hash) result(val)
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type(psb_hash_type) :: hash
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integer(psb_epk_) :: val
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val = 4*psb_sizeof_ip + 2*psb_sizeof_lp
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if (allocated(hash%table)) &
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& val = val + psb_sizeof_lp * size(hash%table)
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end function psb_Sizeof_hash_type
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function psb_hash_avg_acc(hash)
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type(psb_hash_type), intent(in) :: hash
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real(psb_dpk_) :: psb_hash_avg_acc
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psb_hash_avg_acc = dble(hash%nacc)/dble(hash%nsrch)
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end function psb_hash_avg_acc
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subroutine HashFree(hashin,info)
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use psb_realloc_mod
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type(psb_hash_type) :: hashin
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integer(psb_ipk_) :: info
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info = psb_success_
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if (allocated(hashin%table)) then
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deallocate(hashin%table,stat=info)
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end if
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hashin%nbits = 0
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hashin%hsize = 0
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hashin%hmask = 0
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hashin%nk = 0
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end subroutine HashFree
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subroutine HashTransfer(hashin,hashout,info)
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use psb_realloc_mod
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type(psb_hash_type) :: hashin
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type(psb_hash_type) :: hashout
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integer(psb_ipk_), intent(out) :: info
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info = HashOk
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hashout%nbits = hashin%nbits
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hashout%hsize = hashin%hsize
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hashout%hmask = hashin%hmask
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hashout%nk = hashin%nk
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hashout%nsrch = hashin%nsrch
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hashout%nacc = hashin%nacc
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call psb_move_alloc(hashin%table, hashout%table,info)
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end subroutine HashTransfer
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subroutine HashCopy(hashin,hashout,info)
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use psb_realloc_mod
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type(psb_hash_type) :: hashin
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type(psb_hash_type) :: hashout
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integer(psb_ipk_), intent(out) :: info
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info = HashOk
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hashout%nbits = hashin%nbits
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hashout%hsize = hashin%hsize
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hashout%hmask = hashin%hmask
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hashout%nk = hashin%nk
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hashout%nsrch = hashin%nsrch
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hashout%nacc = hashin%nacc
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call psb_safe_ab_cpy(hashin%table, hashout%table,info)
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end subroutine HashCopy
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subroutine CloneHashTable(hashin,hashout,info)
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type(psb_hash_type), pointer :: hashin
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type(psb_hash_type), pointer :: hashout
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integer(psb_ipk_), intent(out) :: info
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if (associated(hashout)) then
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deallocate(hashout,stat=info)
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!if (info /= psb_success_) return
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end if
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if (associated(hashin)) then
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allocate(hashout,stat=info)
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if (info /= psb_success_) return
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call HashCopy(hashin,hashout,info)
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end if
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end subroutine CloneHashTable
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subroutine psb_hash_init_v(v,hash,info)
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integer(psb_ipk_), intent(in) :: v(:)
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type(psb_hash_type), intent(out) :: hash
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: i,j,nbits, nv
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info = psb_success_
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nv = size(v)
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call psb_hash_init(nv,hash,info)
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if (info /= psb_success_) return
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do i=1,nv
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call psb_hash_searchinskey(v(i),j,i,hash,info)
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if ((j /= i).or.(info /= HashOK)) then
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write(psb_err_unit,*) 'Error from hash_ins',i,v(i),j,info
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info = HashNotFound
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return
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end if
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end do
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end subroutine psb_hash_init_v
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subroutine psb_hash_init_lv(v,hash,info)
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integer(psb_lpk_), intent(in) :: v(:)
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type(psb_hash_type), intent(out) :: hash
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integer(psb_ipk_), intent(out) :: info
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integer(psb_lpk_) :: i,j, nv
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info = psb_success_
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nv = size(v)
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call psb_hash_init(nv,hash,info)
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if (info /= psb_success_) return
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do i=1,nv
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call psb_hash_searchinskey(v(i),j,i,hash,info)
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if ((j /= i).or.(info /= HashOK)) then
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write(psb_err_unit,*) 'Error from hash_ins',i,v(i),j,info
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info = HashNotFound
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return
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end if
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end do
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end subroutine psb_hash_init_lv
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subroutine psb_hash_init_n(nv,hash,info)
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integer(psb_ipk_), intent(in) :: nv
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type(psb_hash_type), intent(out) :: hash
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: hsize,nbits
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info = psb_success_
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nbits = psb_hash_bits
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hsize = 2**nbits
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!
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! Figure out the smallest power of 2 bigger than NV
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! Note: in our intended usage NV will be the size of the
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! local index space, NOT the global index space.
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!
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do
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if (hsize < 0) then
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write(psb_err_unit,*) 'Error: hash size overflow ',hsize,nbits
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info = -2
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return
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end if
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if (hsize > nv) exit
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nbits = nbits + 1
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hsize = hsize * 2
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end do
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hash%nbits = nbits
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hash%hsize = hsize
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hash%hmask = hsize-1
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hash%nsrch = 0
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hash%nacc = 0
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allocate(hash%table(0:hsize-1,2),stat=info)
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if (info /= psb_success_) then
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write(psb_err_unit,*) 'Error: memory allocation failure ',hsize
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info = HashOutOfMemory
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return
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end if
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hash%table = HashFreeEntry
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hash%nk = 0
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end subroutine psb_hash_init_n
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subroutine psb_hash_init_ln(nv,hash,info)
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integer(psb_lpk_), intent(in) :: nv
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type(psb_hash_type), intent(out) :: hash
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: hsize,nbits
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info = psb_success_
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nbits = psb_hash_bits
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hsize = 2**nbits
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!
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! Figure out the smallest power of 2 bigger than NV
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! Note: in our intended usage NV will be the size of the
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! local index space, NOT the global index space.
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!
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do
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if (hsize < 0) then
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write(psb_err_unit,*) 'Error: hash size overflow ',hsize,nbits
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info = -2
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return
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end if
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if (hsize > nv) exit
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nbits = nbits + 1
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hsize = hsize * 2
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end do
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hash%nbits = nbits
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hash%hsize = hsize
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hash%hmask = hsize-1
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hash%nsrch = 0
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hash%nacc = 0
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allocate(hash%table(0:hsize-1,2),stat=info)
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if (info /= psb_success_) then
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write(psb_err_unit,*) 'Error: memory allocation failure ',hsize
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info = HashOutOfMemory
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return
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end if
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hash%table = HashFreeEntry
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hash%nk = 0
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end subroutine psb_hash_init_ln
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subroutine psb_hash_realloc(hash,info)
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type(psb_hash_type), intent(inout) :: hash
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integer(psb_ipk_), intent(out) :: info
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type(psb_hash_type) :: nhash
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integer(psb_lpk_) :: key, val, nextval,i
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info = HashOk
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call psb_hash_init((hash%hsize+1),nhash,info)
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if (info /= HashOk) then
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info = HashOutOfMemory
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return
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endif
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do i=0, hash%hsize-1
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key = hash%table(i,1)
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nextval = hash%table(i,2)
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if (key /= HashFreeEntry) then
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call psb_hash_searchinskey(key,val,nextval,nhash,info)
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if (info /= psb_success_) then
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info = HashOutOfMemory
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return
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end if
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end if
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end do
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call HashTransfer(nhash,hash,info)
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end subroutine psb_hash_realloc
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recursive subroutine psb_hash_lsearchinskey(key,val,nextval,hash,info)
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integer(psb_lpk_), intent(in) :: key,nextval
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type(psb_hash_type) :: hash
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integer(psb_lpk_), intent(out) :: val
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: hsize,hmask, hk, hd
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info = HashOK
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hsize = hash%hsize
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hmask = hash%hmask
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hk = iand(psb_hashval(key),hmask)
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if (hk == 0) then
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hd = 1
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else
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hd = hsize - hk
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hd = ior(hd,1)
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end if
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if (.not.allocated(hash%table)) then
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info = HashOutOfMemory
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return
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end if
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hash%nsrch = hash%nsrch + 1
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do
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hash%nacc = hash%nacc + 1
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if (hash%table(hk,1) == key) then
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val = hash%table(hk,2)
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info = HashDuplicate
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return
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end if
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if (hash%table(hk,1) == HashFreeEntry) then
|
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if (hash%nk == hash%hsize -1) then
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!
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! Note: because of the way we allocate things at CDALL
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! time this is really unlikely; if we get here, we
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! have at least as many halo indices as internals, which
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! means we're already in trouble. But we try to keep going.
|
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!
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call psb_hash_realloc(hash,info)
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if (info /= HashOk) then
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info = HashOutOfMemory
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return
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else
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call psb_hash_searchinskey(key,val,nextval,hash,info)
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return
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end if
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else
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hash%nk = hash%nk + 1
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hash%table(hk,1) = key
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hash%table(hk,2) = nextval
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val = nextval
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return
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end if
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end if
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hk = hk - hd
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if (hk < 0) hk = hk + hsize
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end do
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end subroutine psb_hash_lsearchinskey
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|
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recursive subroutine psb_hash_isearchinskey(key,val,nextval,hash,info)
|
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integer(psb_ipk_), intent(in) :: key,nextval
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type(psb_hash_type) :: hash
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integer(psb_ipk_), intent(out) :: val, info
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|
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integer(psb_ipk_) :: hsize,hmask, hk, hd
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info = HashOK
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hsize = hash%hsize
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hmask = hash%hmask
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|
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hk = iand(psb_hashval(key),hmask)
|
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if (hk == 0) then
|
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hd = 1
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else
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hd = hsize - hk
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hd = ior(hd,1)
|
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end if
|
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if (.not.allocated(hash%table)) then
|
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info = HashOutOfMemory
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return
|
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end if
|
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|
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hash%nsrch = hash%nsrch + 1
|
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do
|
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hash%nacc = hash%nacc + 1
|
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if (hash%table(hk,1) == key) then
|
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val = hash%table(hk,2)
|
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info = HashDuplicate
|
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return
|
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end if
|
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if (hash%table(hk,1) == HashFreeEntry) then
|
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if (hash%nk == hash%hsize -1) then
|
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!
|
|
! Note: because of the way we allocate things at CDALL
|
|
! time this is really unlikely; if we get here, we
|
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! have at least as many halo indices as internals, which
|
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! means we're already in trouble. But we try to keep going.
|
|
!
|
|
call psb_hash_realloc(hash,info)
|
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if (info /= HashOk) then
|
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info = HashOutOfMemory
|
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return
|
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else
|
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call psb_hash_searchinskey(key,val,nextval,hash,info)
|
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return
|
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end if
|
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else
|
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hash%nk = hash%nk + 1
|
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hash%table(hk,1) = key
|
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hash%table(hk,2) = nextval
|
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val = nextval
|
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return
|
|
end if
|
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end if
|
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hk = hk - hd
|
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if (hk < 0) hk = hk + hsize
|
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end do
|
|
end subroutine psb_hash_isearchinskey
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|
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subroutine psb_hash_isearchkey(key,val,hash,info)
|
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integer(psb_ipk_), intent(in) :: key
|
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type(psb_hash_type) :: hash
|
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integer(psb_ipk_), intent(out) :: val, info
|
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|
|
integer(psb_ipk_) :: hsize,hmask, hk, hd
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|
|
|
info = HashOK
|
|
if (.not.allocated(hash%table) ) then
|
|
val = HashFreeEntry
|
|
return
|
|
end if
|
|
hsize = hash%hsize
|
|
hmask = hash%hmask
|
|
hk = iand(psb_hashval(key),hmask)
|
|
|
|
if (hk == 0) then
|
|
hd = 1
|
|
else
|
|
hd = hsize - hk
|
|
hd = ior(hd,1)
|
|
end if
|
|
|
|
hash%nsrch = hash%nsrch + 1
|
|
do
|
|
hash%nacc = hash%nacc + 1
|
|
if (hash%table(hk,1) == key) then
|
|
val = hash%table(hk,2)
|
|
return
|
|
end if
|
|
if (hash%table(hk,1) == HashFreeEntry) then
|
|
val = HashFreeEntry
|
|
! !$ info = HashNotFound
|
|
return
|
|
end if
|
|
hk = hk - hd
|
|
if (hk < 0) hk = hk + hsize
|
|
end do
|
|
end subroutine psb_hash_isearchkey
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|
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subroutine psb_hash_lsearchkey(key,val,hash,info)
|
|
integer(psb_lpk_), intent(in) :: key
|
|
type(psb_hash_type) :: hash
|
|
integer(psb_lpk_), intent(out) :: val
|
|
integer(psb_ipk_), intent(out) :: info
|
|
|
|
integer(psb_ipk_) :: hsize,hmask, hk, hd
|
|
|
|
info = HashOK
|
|
if (.not.allocated(hash%table) ) then
|
|
val = HashFreeEntry
|
|
return
|
|
end if
|
|
hsize = hash%hsize
|
|
hmask = hash%hmask
|
|
hk = iand(psb_hashval(key),hmask)
|
|
if (hk == 0) then
|
|
hd = 1
|
|
else
|
|
hd = hsize - hk
|
|
hd = ior(hd,1)
|
|
end if
|
|
|
|
hash%nsrch = hash%nsrch + 1
|
|
do
|
|
hash%nacc = hash%nacc + 1
|
|
if (hash%table(hk,1) == key) then
|
|
val = hash%table(hk,2)
|
|
return
|
|
end if
|
|
if (hash%table(hk,1) == HashFreeEntry) then
|
|
val = HashFreeEntry
|
|
! !$ info = HashNotFound
|
|
return
|
|
end if
|
|
hk = hk - hd
|
|
if (hk < 0) hk = hk + hsize
|
|
end do
|
|
end subroutine psb_hash_lsearchkey
|
|
|
|
end module psb_hash_mod
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