MFC
Exascale flow solver
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m_finite_differences.fpp.f90
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2!>
3!! @file
4!! @brief Contains module m_finite_differences
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231
232! GPU parallel region (scalar reductions, maxval/minval)
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234
235! GPU parallel loop over threads (most common GPU macro)
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237
238! Required closing for GPU_PARALLEL_LOOP
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241! Mark routine for device compilation
242# 112 "/home/runner/work/MFC/MFC/src/common/include/parallel_macros.fpp"
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244! Declare device-resident data
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247! Inner loop within a GPU parallel region
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250! Scoped GPU data region
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253! Host code with device pointers (for MPI with GPU buffers)
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256! Allocate device memory (unscoped)
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259! Free device memory
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262! Atomic operation on device
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265! End atomic capture block
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268! Copy data between host and device
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271! Synchronization barrier
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274! Import GPU library module (openacc or omp_lib)
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296! Caution: This macro requires the use of a binding script to set CUDA_VISIBLE_DEVICES, such that we have one GPU device per MPI
297! rank. That's because for both cudaMemAdvise (preferred location) and cudaMemPrefetchAsync we use location = device_id = 0. For an
298! example see misc/nvidia_uvm/bind.sh. NVIDIA unified memory page placement hint
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301! Allocate and create GPU device memory
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304! Free GPU device memory and deallocate
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307! Cray-specific GPU pointer setup for vector fields
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309
310! Cray-specific GPU pointer setup for scalar fields
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321
322!> @brief Finite difference operators for computing divergence of velocity fields
323module m_finite_differences
324
325 use m_global_parameters
326
327 implicit none
328
329contains
330
331 !> Compute the centered finite-difference coefficients for first-order spatial derivatives in the s-coordinate direction (x, y,
332 !! or z). Supports up to 4th order accuracy.
333 !! @param fd_coeff_s Finite-diff. coefficients in the s-coordinate direction
334 !! @param fd_number_in Finite-difference number
335 !! @param fd_order_in Finite-difference order of accuracy
336 !! @param offset_s Optional offset bounds in the s-coordinate direction
337 subroutine s_compute_finite_difference_coefficients(q, s_cc, fd_coeff_s, local_buff_size, fd_number_in, fd_order_in, offset_s)
338
339 integer :: lB, lE !< loop bounds
340 integer, intent(in) :: q
341 integer, intent(in) :: local_buff_size, fd_number_in, fd_order_in
342 type(int_bounds_info), optional, intent(in) :: offset_s
343 real(wp), allocatable, dimension(:,:), intent(inout) :: fd_coeff_s
344 real(wp), dimension(-local_buff_size:q + local_buff_size), intent(in) :: s_cc
345 integer :: i !< Generic loop iterator
346
347 if (present(offset_s)) then
348 lb = -offset_s%beg
349 le = q + offset_s%end
350 else
351 lb = 0
352 le = q
353 end if
354
355#ifdef MFC_POST_PROCESS
356 if (allocated(fd_coeff_s)) deallocate (fd_coeff_s)
357 allocate (fd_coeff_s(-fd_number_in:fd_number_in,lb:le))
358#endif
359
360 ! Computing the 1st order finite-difference coefficients
361 if (fd_order_in == 1) then
362 do i = lb, le
363 fd_coeff_s(-1, i) = 0._wp
364 fd_coeff_s(0, i) = -1._wp/(s_cc(i + 1) - s_cc(i))
365 fd_coeff_s(1, i) = -fd_coeff_s(0, i)
366 end do
367
368 ! Computing the 2nd order finite-difference coefficients
369 else if (fd_order_in == 2) then
370 do i = lb, le
371 fd_coeff_s(-1, i) = -1._wp/(s_cc(i + 1) - s_cc(i - 1))
372 fd_coeff_s(0, i) = 0._wp
373 fd_coeff_s(1, i) = -fd_coeff_s(-1, i)
374 end do
375
376 ! Computing the 4th order finite-difference coefficients
377 else
378 do i = lb, le
379 fd_coeff_s(-2, i) = 1._wp/(s_cc(i - 2) - 8._wp*s_cc(i - 1) - s_cc(i + 2) + 8._wp*s_cc(i + 1))
380 fd_coeff_s(-1, i) = -8._wp*fd_coeff_s(-2, i)
381 fd_coeff_s(0, i) = 0._wp
382 fd_coeff_s(1, i) = -fd_coeff_s(-1, i)
383 fd_coeff_s(2, i) = -fd_coeff_s(-2, i)
384 end do
385 end if
386
387 end subroutine s_compute_finite_difference_coefficients
388
389end module m_finite_differences
m_finite_differences
Finite difference operators for computing divergence of velocity fields.
Definition m_finite_differences.fpp.f90:323
m_finite_differences::s_compute_finite_difference_coefficients
subroutine s_compute_finite_difference_coefficients(q, s_cc, fd_coeff_s, local_buff_size, fd_number_in, fd_order_in, offset_s)
Compute the centered finite-difference coefficients for first-order spatial derivatives in the s-coor...
Definition m_finite_differences.fpp.f90:338
m_global_parameters
Global parameters for the computational domain, fluid properties, and simulation algorithm configurat...
Definition m_global_parameters.fpp.f90:334