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!>
! @license Apache-2.0
!
! Copyright (c) 2018 The Stdlib Authors.
!
! Licensed under the Apache License, Version 2.0 (the "License");
! you may not use this file except in compliance with the License.
! You may obtain a copy of the License at
!
! http://www.apache.org/licenses/LICENSE-2.0
!
! Unless required by applicable law or agreed to in writing, software
! distributed under the License is distributed on an "AS IS" BASIS,
! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
! See the License for the specific language governing permissions and
! limitations under the License.
!<
!> Benchmark `scopy`.
!
! ## Notes
!
! - Written in "free form" Fortran 95.
!
!<
program bench
implicit none
! ..
! Local constants:
character(5), parameter :: name = 'scopy' ! if changed, be sure to adjust length
integer, parameter :: iterations = 10000000
integer, parameter :: repeats = 3
integer, parameter :: min = 1
integer, parameter :: max = 6
! ..
! Run the benchmarks:
call main()
! ..
! Functions:
contains
! ..
! Prints the TAP version.
! ..
subroutine print_version()
print '(A)', 'TAP version 13'
end subroutine print_version
! ..
! Prints the TAP summary.
!
! @param {integer} total - total number of tests
! @param {integer} passing - total number of passing tests
! ..
subroutine print_summary( total, passing )
! ..
! Scalar arguments:
integer, intent(in) :: total, passing
! ..
! Local variables:
character(len=999) :: str, tmp
! ..
! Intrinsic functions:
intrinsic adjustl, trim
! ..
print '(A)', '#'
! ..
write (str, '(I15)') total ! TAP plan
tmp = adjustl( str )
print '(A,A)', '1..', trim( tmp )
! ..
print '(A,A)', '# total ', trim( tmp )
! ..
write (str, '(I15)') passing
tmp = adjustl( str )
print '(A,A)', '# pass ', trim( tmp )
! ..
print '(A)', '#'
print '(A)', '# ok'
end subroutine print_summary
! ..
! Prints benchmarks results.
!
! @param {integer} iterations - number of iterations
! @param {double} elapsed - elapsed time in seconds
! ..
subroutine print_results( iterations, elapsed )
! ..
! Scalar arguments:
double precision, intent(in) :: elapsed
integer, intent(in) :: iterations
! ..
! Local variables:
double precision :: rate
character(len=999) :: str, tmp
! ..
! Intrinsic functions:
intrinsic dble, adjustl, trim
! ..
rate = dble( iterations ) / elapsed
! ..
print '(A)', ' ---'
! ..
write (str, '(I15)') iterations
tmp = adjustl( str )
print '(A,A)', ' iterations: ', trim( tmp )
! ..
write (str, '(f0.9)') elapsed
tmp = adjustl( str )
print '(A,A)', ' elapsed: ', trim( tmp )
! ..
write( str, '(f0.9)') rate
tmp = adjustl( str )
print '(A,A)', ' rate: ', trim( tmp )
! ..
print '(A)', ' ...'
end subroutine print_results
! ..
! Runs a benchmark.
!
! @param {integer} iterations - number of iterations
! @param {integer} len - array length
! @return {double} elapsed time in seconds
! ..
double precision function benchmark( iterations, len )
! ..
! External functions:
interface
subroutine scopy( N, sx, strideX, sy, strideY )
real :: sx(*), sy(*)
integer :: strideX, strideY, N
end subroutine scopy
end interface
! ..
! Scalar arguments:
integer, intent(in) :: iterations, len
! ..
! Local scalars:
double precision :: elapsed, r
real :: t1, t2
integer :: i
! ..
! Local arrays:
real, allocatable :: x(:), y(:)
! ..
! Intrinsic functions:
intrinsic random_number, cpu_time
! ..
! Allocate arrays:
allocate( x(len), y(len) )
! ..
do i = 1, len
call random_number( r )
x( i ) = ( real(r)*20000.0 ) - 10000.0
y( i ) = 0.0
end do
! ..
call cpu_time( t1 )
! ..
do i = 1, iterations
call scopy( len, x, 1, y, 1 );
if ( y( 1 ) /= y( 1 ) ) then
print '(A)', 'should not return NaN'
exit
end if
end do
! ..
call cpu_time( t2 )
! ..
elapsed = t2 - t1
! ..
if ( y( 1 ) /= y( 1 ) ) then
print '(A)', 'should not return NaN'
end if
! ..
! Deallocate arrays:
deallocate( x, y )
! ..
benchmark = elapsed
return
end function benchmark
! ..
! Main execution sequence.
! ..
subroutine main()
! ..
! Local variables:
integer :: count, iter, len, i, j
double precision :: elapsed
character(len=999) :: str, tmp
! ..
! Intrinsic functions:
intrinsic adjustl, trim
! ..
call print_version()
count = 0
do i = min, max
len = 10**i
iter = iterations / 10**(i-1)
do j = 1, repeats
count = count + 1
! ..
write (str, '(I15)') len
tmp = adjustl( str )
print '(A,A,A,A)', '# fortran::', name, ':len=', trim( tmp )
! ..
elapsed = benchmark( iter, len )
! ..
call print_results( iter, elapsed )
! ..
write (str, '(I15)') count
tmp = adjustl( str )
print '(A,A,A)', 'ok ', trim( tmp ), ' benchmark finished'
end do
end do
call print_summary( count, count )
end subroutine main
end program bench
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