| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| subroutine read_input |
| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| implicit none |
| |
| include 'mpinpb.h' |
| include 'applu.incl' |
| |
| integer IERROR, fstatus, nnodes |
| |
| |
| c--------------------------------------------------------------------- |
| c only root reads the input file |
| c if input file does not exist, it uses defaults |
| c ipr = 1 for detailed progress output |
| c inorm = how often the norm is printed (once every inorm iterations) |
| c itmax = number of pseudo time steps |
| c dt = time step |
| c omega 1 over-relaxation factor for SSOR |
| c tolrsd = steady state residual tolerance levels |
| c nx, ny, nz = number of grid points in x, y, z directions |
| c--------------------------------------------------------------------- |
| ROOT = 0 |
| if (id .eq. ROOT) then |
| |
| write(*, 1000) |
| |
| open (unit=3,file='timer.flag',status='old',iostat=fstatus) |
| timeron = .false. |
| if (fstatus .eq. 0) then |
| timeron = .true. |
| close(3) |
| endif |
| |
| open (unit=3,file='inputlu.data',status='old', |
| > access='sequential',form='formatted', iostat=fstatus) |
| if (fstatus .eq. 0) then |
| |
| write(*, *) 'Reading from input file inputlu.data' |
| |
| read (3,*) |
| read (3,*) |
| read (3,*) ipr, inorm |
| read (3,*) |
| read (3,*) |
| read (3,*) itmax |
| read (3,*) |
| read (3,*) |
| read (3,*) dt |
| read (3,*) |
| read (3,*) |
| read (3,*) omega |
| read (3,*) |
| read (3,*) |
| read (3,*) tolrsd(1),tolrsd(2),tolrsd(3),tolrsd(4),tolrsd(5) |
| read (3,*) |
| read (3,*) |
| read (3,*) nx0, ny0, nz0 |
| close(3) |
| else |
| ipr = ipr_default |
| inorm = inorm_default |
| itmax = itmax_default |
| dt = dt_default |
| omega = omega_default |
| tolrsd(1) = tolrsd1_def |
| tolrsd(2) = tolrsd2_def |
| tolrsd(3) = tolrsd3_def |
| tolrsd(4) = tolrsd4_def |
| tolrsd(5) = tolrsd5_def |
| nx0 = isiz01 |
| ny0 = isiz02 |
| nz0 = isiz03 |
| endif |
| |
| c--------------------------------------------------------------------- |
| c check problem size |
| c--------------------------------------------------------------------- |
| call MPI_COMM_SIZE(MPI_COMM_WORLD, nnodes, ierror) |
| if (nnodes .ne. nnodes_compiled) then |
| write (*, 2000) nnodes, nnodes_compiled |
| 2000 format (5x,'Warning: program is running on',i5,' processors' |
| > /5x,'but was compiled for ', i5) |
| endif |
| |
| if ( ( nx0 .lt. 4 ) .or. |
| > ( ny0 .lt. 4 ) .or. |
| > ( nz0 .lt. 4 ) ) then |
| |
| write (*,2001) |
| 2001 format (5x,'PROBLEM SIZE IS TOO SMALL - ', |
| > /5x,'SET EACH OF NX, NY AND NZ AT LEAST EQUAL TO 5') |
| CALL MPI_ABORT( MPI_COMM_WORLD, MPI_ERR_OTHER, IERROR ) |
| |
| end if |
| |
| if ( ( nx0 .gt. isiz01 ) .or. |
| > ( ny0 .gt. isiz02 ) .or. |
| > ( nz0 .gt. isiz03 ) ) then |
| |
| write (*,2002) |
| 2002 format (5x,'PROBLEM SIZE IS TOO LARGE - ', |
| > /5x,'NX, NY AND NZ SHOULD BE LESS THAN OR EQUAL TO ', |
| > /5x,'ISIZ01, ISIZ02 AND ISIZ03 RESPECTIVELY') |
| CALL MPI_ABORT( MPI_COMM_WORLD, MPI_ERR_OTHER, IERROR ) |
| |
| end if |
| |
| |
| write(*, 1001) nx0, ny0, nz0 |
| write(*, 1002) itmax |
| write(*, 1003) nnodes |
| |
| 1000 format(//, ' NAS Parallel Benchmarks 3.3 -- LU Benchmark',/) |
| 1001 format(' Size: ', i4, 'x', i4, 'x', i4) |
| 1002 format(' Iterations: ', i4) |
| 1003 format(' Number of processes: ', i5, /) |
| |
| |
| |
| end if |
| |
| call bcast_inputs |
| |
| return |
| end |
| |
| |
