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C
C $Id: gexample.f,v 1.3 1997/08/04 15:38:55 pvmsrc Exp $
C
C Example of some group function and reduction functions in PVM
C SPMD style program
C
C 11 March 1994 - Creation by P. Papadopoulos (phil@msr.epm.ornl.gov)
C
C
C
program gexample
implicit none
include '../include/fpvm3.h'
C --- Set Initial and Default Parameters
integer DEF_DIMENSION, INITTAG,SUMTAG,PRODTAG
parameter (DEF_DIMENSION = 100 )
parameter (INITTAG = 1000 )
parameter (SUMTAG = INITTAG+1)
parameter (PRODTAG = INITTAG+2)
integer mytid, myinst, nproc, maxmax, root
integer dimension, ninst, bufid
integer tids(32)
integer nsibs
integer nhost, narch, dtid, speed
integer blksize, nextra, mysrow, i, j, itemp, info
integer subblock(DEF_DIMENSION,DEF_DIMENSION)
integer colsum(DEF_DIMENSION)
real*8 colprod(DEF_DIMENSION)
character*32 host, arch
logical spmd
C --- External declarations of PVM and User defined reduce function
external PvmSum
external calcprod
C ---------------- Begin Program -----------------------------------------
spmd = .false.
c Enroll in PVM and join a group
call pvmfmytid( mytid )
C Try to determine if we were spawned spmd-style
call pvmfsiblings(nsibs, 0, tids(1))
if (nsibs .gt. 1) spmd = .true.
call pvmfjoingroup( 'matrix', myinst )
if( myinst .lt. 0 ) then
call pvmfperror( 'joingroup: ', info)
call pvmfexit( info )
stop
endif
c Set matrix size and number of tasks.
call pvmfconfig( nhost, narch, dtid, host, arch, speed, info )
nproc = 2*nhost
if( nproc .gt. 32 ) nproc = 32
dimension = DEF_DIMENSION
if( myinst .eq. 0 ) then
print*
print*, 'This program demonstrates some group and reduction'
print*, 'operations in PVM. The output displays the'
print*, 'the product of the first column of a 100x100 Toeplitz'
print*, 'matrix and the matrix 1-norm. The matrix data is'
print*, 'distributed among several tasks. The Toeplitz'
print*, 'matrix is symmetric with the first row being the'
print*, 'row vector [1 2 ... n].'
print*
c Start up more copies of myself
if(nproc .gt. 1 .and. .not.spmd) then
print*, 'There are ',nhost, ' machines in the configuration'
print*, 'Starting ',nproc - 1, ' tasks'
call pvmfspawn( 'fgexample', PVMDEFAULT, '*',
> nproc -1, tids, ninst )
if( ninst .lt. nproc-1 ) then
print*, 'Trouble in spawn. Check tids'
print*, tids
call pvmflvgroup( 'matrix', info )
call pvmfexit( info )
endif
endif
if ( spmd ) nproc = nsibs
print*, ' --> using ', nproc, ' processors <--'
print*
endif
c Wait till everyone has joined the group and freeze it
call pvmffreezegroup( 'matrix', nproc, info )
c Broadcast input data to all members
if( myinst .eq. 0 ) then
call pvmfinitsend( PVMDEFAULT, bufid )
call pvmfpack(INTEGER4, nproc, 1, 1, info)
call pvmfpack(INTEGER4, dimension, 1, 1, info )
call pvmfbcast( 'matrix', INITTAG ,info )
else
call pvmfrecv( -1, INITTAG, info )
call pvmfunpack( INTEGER4, nproc, 1, 1 ,info)
call pvmfunpack( INTEGER4, dimension, 1, 1, info)
endif
C Map matrix rows to processors --
blksize = dimension/nproc
nextra = mod(dimension, nproc)
if( myinst .lt. nextra ) then
mysrow = 1 + (blksize + 1) * myinst
blksize = blksize + 1
else
mysrow = 1+ (blksize + 1)*(nextra) + blksize*(myinst - nextra)
endif
if( mysrow .gt. dimension) then
blksize = 0
endif
C Assign data to this subblock. The entries below make the entire matrix
C a symmetric Toeplitz matrix (i.e. diagonals are of constant value)
do j=1, dimension
do i=1, blksize
subblock(i,j) = abs(mysrow + i - j)
end do
end do
C Locally compute the sum of each column and put into colsum
do j=1, dimension
colsum(j) = 0
colprod(j) = 1.0
end do
do j=1, dimension
do i=1,blksize
itemp = abs ( subblock(i,j) )
colsum(j) = colsum(j) + itemp
colprod(j) = colprod(j) * itemp
end do
end do
C Get global sum by calling reduce using PvmSum
root = 0
call pvmfreduce( PvmSum, colsum, dimension, INTEGER4, SUMTAG,
> 'matrix', root, info)
c Here is example of supplying a user-defined OP to reduce
call pvmfreduce( calcprod, colprod, dimension, REAL8, PRODTAG,
> 'matrix', root, info)
c Root prints out result
if( myinst .eq. root ) then
maxmax = 0
do j=1,dimension
maxmax = max(colsum(j),maxmax)
end do
write(6,*) ' The 1-Norm is ', maxmax
write(6,1000) dimension
write(6,*) ' The product of column 1 is', colprod(1)
write(6,1001) dimension
endif
1000 format(' (Should be the sum of the first ', I3, ' integers)')
1001 format(' (Should be ', I3, ' factorial)')
c Problem done. Be sure all members have finished computation before exit.
call pvmfbarrier( 'matrix', nproc, info)
call pvmflvgroup( 'matrix', info)
call pvmfexit( info )
stop
end
c----------------------------------------------------------------------------
C *** Example of a User-defined Reduction Function ***/
subroutine calcprod( datatype, x, y, num, info )
integer datatype
real*8 x(num), y(num)
integer num, info
integer i
do i=1,num
x(i) = x(i) * y(i)
end do
return
end
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