C********************************************************************* C C This benchmark test program is measuring a cpu performance C of floating point operation by a Poisson equation solver. CC C If you have any question, please ask me via email. C written by Ryutaro HIMENO, November 26, 2001. C Version 3.0 C ---------------------------------------------- C Ryutaro Himeno, Dr. of Eng. C Head of Computer Information Division, C RIKEN (The Institute of Pysical and Chemical Research) C Email : himeno@postman.riken.go.jp C --------------------------------------------------------------- C You can adjust the size of this benchmark code to fit your target C computer. In that case, please chose following sets of C (mimax,mjmax,mkmax): C small : 65,33,33 C small : 129,65,65 C midium: 257,129,129 C large : 513,257,257 C ext.large: 1025,513,513 C This program is to measure a computer performance in MFLOPS C by using a kernel which appears in a linear solver of pressure C Poisson eq. which appears in an incompressible Navier-Stokes solver. C A point-Jacobi method is employed in this solver as this method can C be easyly vectrized and be parallelized. C ------------------ C Finite-difference method, curvilinear coodinate system C Vectorizable and parallelizable on each grid point C No. of grid points : imax x jmax x kmax including boundaries C ------------------ C A,B,C:coefficient matrix, wrk1: source term of Poisson equation C wrk2 : working area, OMEGA : relaxation parameter C BND:control variable for boundaries and objects ( = 0 or 1) C P: pressure C ------------------- C ------------------- C "use portlib" statement on the next line is for Visual fortran C to use UNIX libraries. Please remove it if your system is UNIX. C ------------------- ! use portlib use omp_lib IMPLICIT REAL*4(a-h,o-z) real*8 t1,t2 C C PARAMETER (mimax=513,mjmax=257,mkmax=257) C PARAMETER (mimax=257,mjmax=129,mkmax=129) PARAMETER (mimax=129,mjmax=65,mkmax=65) C PARAMETER (mimax=65,mjmax=33,mkmax=33) C C ttarget specifys the measuring period in sec PARAMETER (ttarget=60.0) CC Arrey common /pres/ p(mimax,mjmax,mkmax) common /mtrx/ a(mimax,mjmax,mkmax,4), + b(mimax,mjmax,mkmax,3),c(mimax,mjmax,mkmax,3) common /bound/ bnd(mimax,mjmax,mkmax) common /work/ wrk1(mimax,mjmax,mkmax),wrk2(mimax,mjmax,mkmax) CC Other constants common /others/ imax,jmax,kmax,omega C dimension time0(2),time1(2) C omega=0.8 imax=mimax-1 jmax=mjmax-1 kmax=mkmax-1 CC Initializing matrixes call initmt write(*,*) ' mimax=',mimax,' mjmax=',mjmax,' mkmax=',mkmax write(*,*) ' imax=',imax,' jmax=',jmax,' kmax=',kmax CC Start measuring C nn=10000 write(*,*) ' Start rehearsal measurement process.' write(*,*) ' Measure the performance in 10000 times.' C cpu0=dtime(time0) t1=omp_get_wtime() C C Jacobi iteration call jacobi(nn,gosa) C cpu1= dtime(time1) t2=omp_get_wtime() cpu = cpu1 cpu = t2-t1 flop=real(kmax-2)*real(jmax-2)*real(imax-2)*34.0*real(nn) xmflops2=flop/cpu*1.0e-6 write(*,*) ' MFLOPS:',xmflops2,' time(s):',cpu,gosa C C end the test loop ! nn=ifix(ttarget/(cpu/3.0)) ! write(*,*) 'Now, start the actual measurement process.' ! write(*,*) 'The loop will be excuted in',nn,' times.' ! write(*,*) 'This will take about one minute.' ! write(*,*) 'Wait for a while.' C C Jacobi iteration ! cpu0=dtime(time0) ! call jacobi(nn,gosa) C ! cpu1= dtime(time1) ! cpu = cpu1 ! flop=real(kmax-2)*real(jmax-2)*real(imax-2)*34.0*real(nn) ! xmflops2=flop*1.0e-6/cpu C CCC xmflops2=nflop/cpu*1.0e-6*float(nn) C ! write(*,*) ' Loop executed for ',nn,' times' ! write(*,*) ' Gosa :',gosa ! write(*,*) ' MFLOPS:',xmflops2, ' time(s):',cpu ! score=xmflops2/82.84 ! write(*,*) ' Score based on Pentium III 600MHz :',score C ! pause stop END C C C************************************************************** subroutine initmt C************************************************************** IMPLICIT REAL*4(a-h,o-z) C C PARAMETER (mimax=513,mjmax=257,mkmax=257) C PARAMETER (mimax=257,mjmax=129,mkmax=129) PARAMETER (mimax=129,mjmax=65,mkmax=65) C PARAMETER (mimax=65,mjmax=33,mkmax=33) C CC Arrey common /pres/ p(mimax,mjmax,mkmax) common /mtrx/ a(mimax,mjmax,mkmax,4), + b(mimax,mjmax,mkmax,3),c(mimax,mjmax,mkmax,3) common /bound/ bnd(mimax,mjmax,mkmax) common /work/ wrk1(mimax,mjmax,mkmax),wrk2(mimax,mjmax,mkmax) CC other constants common /others/ imax,jmax,kmax,omega C do k=1,mkmax do j=1,mjmax do i=1,mimax a(i,j,k,1)=0.0 a(i,j,k,2)=0.0 a(i,j,k,3)=0.0 a(i,j,k,4)=0.0 b(i,j,k,1)=0.0 b(i,j,k,2)=0.0 b(i,j,k,3)=0.0 c(i,j,k,1)=0.0 c(i,j,k,2)=0.0 c(i,j,k,3)=0.0 p(i,j,k) =0.0 wrk1(i,j,k)=0.0 bnd(i,j,k)=0.0 enddo enddo enddo C do k=1,kmax do j=1,jmax do i=1,imax a(i,j,k,1)=1.0 a(i,j,k,2)=1.0 a(i,j,k,3)=1.0 a(i,j,k,4)=1.0/6.0 b(i,j,k,1)=0.0 b(i,j,k,2)=0.0 b(i,j,k,3)=0.0 c(i,j,k,1)=1.0 c(i,j,k,2)=1.0 c(i,j,k,3)=1.0 p(i,j,k) =float((k-1)*(k-1))/float((kmax-1)*(kmax-1)) wrk1(i,j,k)=0.0 bnd(i,j,k)=1.0 enddo enddo enddo C return end C C************************************************************* subroutine jacobi(nn,gosa) C************************************************************* IMPLICIT REAL*4(a-h,o-z) C C PARAMETER (mimax=513,mjmax=257,mkmax=257) C PARAMETER (mimax=257,mjmax=129,mkmax=129) PARAMETER (mimax=129,mjmax=65,mkmax=65) C PARAMETER (mimax=65,mjmax=33,mkmax=33) C CC Arrey common /pres/ p(mimax,mjmax,mkmax) common /mtrx/ a(mimax,mjmax,mkmax,4), + b(mimax,mjmax,mkmax,3),c(mimax,mjmax,mkmax,3) common /bound/ bnd(mimax,mjmax,mkmax) common /work/ wrk1(mimax,mjmax,mkmax),wrk2(mimax,mjmax,mkmax) CC other constants common /others/ imax,jmax,kmax,omega C C DO loop=1,nn gosa=0.0 DO K=2,kmax-1 DO J=2,jmax-1 DO I=2,imax-1 S0=a(I,J,K,1)*p(I+1,J,K)+a(I,J,K,2)*p(I,J+1,K) 1 +a(I,J,K,3)*p(I,J,K+1) 2 +b(I,J,K,1)*(p(I+1,J+1,K)-p(I+1,J-1,K) 3 -p(I-1,J+1,K)+p(I-1,J-1,K)) 4 +b(I,J,K,2)*(p(I,J+1,K+1)-p(I,J-1,K+1) 5 -p(I,J+1,K-1)+p(I,J-1,K-1)) 6 +b(I,J,K,3)*(p(I+1,J,K+1)-p(I-1,J,K+1) 7 -p(I+1,J,K-1)+p(I-1,J,K-1)) 8 +c(I,J,K,1)*p(I-1,J,K)+c(I,J,K,2)*p(I,J-1,K) 9 +c(I,J,K,3)*p(I,J,K-1)+wrk1(I,J,K) SS=(S0*a(I,J,K,4)-p(I,J,K))*bnd(I,J,K) GOSA=GOSA+SS*SS wrk2(I,J,K)=p(I,J,K)+OMEGA *SS enddo enddo enddo C DO K=2,kmax-1 DO J=2,jmax-1 DO I=2,imax-1 p(I,J,K)=wrk2(I,J,K) enddo enddo enddo C enddo CC End of iteration return end