[Fortran] 纯文本查看 复制代码
program arraymult
implicit none
integer, parameter:: N=2000
integer :: i,j
real(16), dimension(N,N):: a=0._16, b=0._16, c0=0._16, c1=0._16
! real(16), dimension(N*N):: aa=0, bb=0, cc=0
character (len=20):: date,time
real :: tt0,tt1
call date_and_time(date,time)
print *, "date=", date, "; time=", time
call cpu_time(tt0)
a=reshape([(50._16-(N**2-1._16)/2.+i,i=1,N**2)],[N,N])
b=reshape([(100._16-(N**2-1._16)/2.+i,i=1,N**2)],[N,N])
! aa=reshape(a,[N*N])
! bb=reshape(b,[N*N])
call cpu_time(tt1)
print *, "date=", date, "; time=", time
print *, "reshape spend=", tt1-tt0
call date_and_time(date,time)
print *, "date=", date, "; time=", time
call cpu_time(tt0)
c0=matmul(a,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
! c0=matmul(c0,b)
call date_and_time(date,time)
call cpu_time(tt1)
print *, "date=", date, "; time=", time
print *, "multi spend=", tt1-tt0
! print *,"complete first"
end program