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7 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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39 * \brief This file contains function definitions necessary for
40 * computing energies and forces for the PME long-ranged part (Coulomb
43 * \author Erik Lindahl <erik@kth.se>
44 * \author Berk Hess <hess@kth.se>
45 * \ingroup module_ewald
47 /* IMPORTANT FOR DEVELOPERS:
49 * Triclinic pme stuff isn't entirely trivial, and we've experienced
50 * some bugs during development (many of them due to me). To avoid
51 * this in the future, please check the following things if you make
52 * changes in this file:
54 * 1. You should obtain identical (at least to the PME precision)
55 * energies, forces, and virial for
56 * a rectangular box and a triclinic one where the z (or y) axis is
57 * tilted a whole box side. For instance you could use these boxes:
59 * rectangular triclinic
64 * 2. You should check the energy conservation in a triclinic box.
66 * It might seem an overkill, but better safe than sorry.
86 #include "gromacs/domdec/domdec.h"
87 #include "gromacs/ewald/ewald-utils.h"
88 #include "gromacs/fft/parallel_3dfft.h"
89 #include "gromacs/fileio/pdbio.h"
90 #include "gromacs/gmxlib/network.h"
91 #include "gromacs/gmxlib/nrnb.h"
92 #include "gromacs/math/gmxcomplex.h"
93 #include "gromacs/math/invertmatrix.h"
94 #include "gromacs/math/units.h"
95 #include "gromacs/math/vec.h"
96 #include "gromacs/math/vectypes.h"
97 #include "gromacs/mdtypes/commrec.h"
98 #include "gromacs/mdtypes/forcerec.h"
99 #include "gromacs/mdtypes/inputrec.h"
100 #include "gromacs/mdtypes/md_enums.h"
101 #include "gromacs/pbcutil/pbc.h"
102 #include "gromacs/timing/cyclecounter.h"
103 #include "gromacs/timing/wallcycle.h"
104 #include "gromacs/timing/walltime_accounting.h"
105 #include "gromacs/utility/basedefinitions.h"
106 #include "gromacs/utility/exceptions.h"
107 #include "gromacs/utility/fatalerror.h"
108 #include "gromacs/utility/gmxmpi.h"
109 #include "gromacs/utility/gmxomp.h"
110 #include "gromacs/utility/logger.h"
111 #include "gromacs/utility/real.h"
112 #include "gromacs/utility/smalloc.h"
113 #include "gromacs/utility/stringutil.h"
114 #include "gromacs/utility/unique_cptr.h"
116 #include "calculate-spline-moduli.h"
117 #include "pme-gather.h"
118 #include "pme-gpu-internal.h"
119 #include "pme-grid.h"
120 #include "pme-internal.h"
121 #include "pme-redistribute.h"
122 #include "pme-solve.h"
123 #include "pme-spline-work.h"
124 #include "pme-spread.h"
126 bool pme_gpu_supports_input(const t_inputrec
*ir
, std::string
*error
)
128 std::list
<std::string
> errorReasons
;
129 if (!EEL_PME(ir
->coulombtype
))
131 errorReasons
.push_back("systems that do not use PME for electrostatics");
133 if (ir
->pme_order
!= 4)
135 errorReasons
.push_back("interpolation orders other than 4");
137 if (ir
->efep
!= efepNO
)
139 errorReasons
.push_back("free energy calculations (multiple grids)");
141 if (EVDW_PME(ir
->vdwtype
))
143 errorReasons
.push_back("Lennard-Jones PME");
147 errorReasons
.push_back("double precision");
150 #if GMX_GPU != GMX_GPU_CUDA
152 errorReasons
.push_back("non-CUDA build of GROMACS");
155 if (ir
->cutoff_scheme
== ecutsGROUP
)
157 errorReasons
.push_back("group cutoff scheme");
161 errorReasons
.push_back("test particle insertion");
164 bool inputSupported
= errorReasons
.empty();
165 if (!inputSupported
&& error
)
167 std::string regressionTestMarker
= "PME GPU does not support";
168 // this prefix is tested for in the regression tests script gmxtest.pl
169 *error
= regressionTestMarker
+ ": " + gmx::joinStrings(errorReasons
, "; ") + ".";
171 return inputSupported
;
174 /*! \brief \libinternal
175 * Finds out if PME with given inputs is possible to run on GPU.
176 * This function is an internal final check, validating the whole PME structure on creation,
177 * but it still duplicates the preliminary checks from the above (externally exposed) pme_gpu_supports_input() - just in case.
179 * \param[in] pme The PME structure.
180 * \param[out] error The error message if the input is not supported on GPU.
181 * \returns True if this PME input is possible to run on GPU, false otherwise.
183 static bool pme_gpu_check_restrictions(const gmx_pme_t
*pme
, std::string
*error
)
185 std::list
<std::string
> errorReasons
;
186 if (pme
->nnodes
!= 1)
188 errorReasons
.push_back("PME decomposition");
190 if (pme
->pme_order
!= 4)
192 errorReasons
.push_back("interpolation orders other than 4");
196 errorReasons
.push_back("free energy calculations (multiple grids)");
200 errorReasons
.push_back("Lennard-Jones PME");
204 errorReasons
.push_back("double precision");
207 #if GMX_GPU != GMX_GPU_CUDA
209 errorReasons
.push_back("non-CUDA build of GROMACS");
213 bool inputSupported
= errorReasons
.empty();
214 if (!inputSupported
&& error
)
216 std::string regressionTestMarker
= "PME GPU does not support";
217 // this prefix is tested for in the regression tests script gmxtest.pl
218 *error
= regressionTestMarker
+ ": " + gmx::joinStrings(errorReasons
, "; ") + ".";
220 return inputSupported
;
223 PmeRunMode
pme_run_mode(const gmx_pme_t
*pme
)
225 GMX_ASSERT(pme
!= nullptr, "Expecting valid PME data pointer");
229 /*! \brief Number of bytes in a cache line.
231 * Must also be a multiple of the SIMD and SIMD4 register size, to
232 * preserve alignment.
234 const int gmxCacheLineSize
= 64;
236 //! Set up coordinate communication
237 static void setup_coordinate_communication(pme_atomcomm_t
*atc
)
245 for (i
= 1; i
<= nslab
/2; i
++)
247 fw
= (atc
->nodeid
+ i
) % nslab
;
248 bw
= (atc
->nodeid
- i
+ nslab
) % nslab
;
251 atc
->node_dest
[n
] = fw
;
252 atc
->node_src
[n
] = bw
;
257 atc
->node_dest
[n
] = bw
;
258 atc
->node_src
[n
] = fw
;
264 /*! \brief Round \p n up to the next multiple of \p f */
265 static int mult_up(int n
, int f
)
267 return ((n
+ f
- 1)/f
)*f
;
270 /*! \brief Return estimate of the load imbalance from the PME grid not being a good match for the number of PME ranks */
271 static double estimate_pme_load_imbalance(struct gmx_pme_t
*pme
)
276 nma
= pme
->nnodes_major
;
277 nmi
= pme
->nnodes_minor
;
279 n1
= mult_up(pme
->nkx
, nma
)*mult_up(pme
->nky
, nmi
)*pme
->nkz
;
280 n2
= mult_up(pme
->nkx
, nma
)*mult_up(pme
->nkz
, nmi
)*pme
->nky
;
281 n3
= mult_up(pme
->nky
, nma
)*mult_up(pme
->nkz
, nmi
)*pme
->nkx
;
283 /* pme_solve is roughly double the cost of an fft */
285 return (n1
+ n2
+ 3*n3
)/(double)(6*pme
->nkx
*pme
->nky
*pme
->nkz
);
288 /*! \brief Initialize atom communication data structure */
289 static void init_atomcomm(struct gmx_pme_t
*pme
, pme_atomcomm_t
*atc
,
290 int dimind
, gmx_bool bSpread
)
294 atc
->dimind
= dimind
;
301 atc
->mpi_comm
= pme
->mpi_comm_d
[dimind
];
302 MPI_Comm_size(atc
->mpi_comm
, &atc
->nslab
);
303 MPI_Comm_rank(atc
->mpi_comm
, &atc
->nodeid
);
307 fprintf(debug
, "For PME atom communication in dimind %d: nslab %d rank %d\n", atc
->dimind
, atc
->nslab
, atc
->nodeid
);
311 atc
->bSpread
= bSpread
;
312 atc
->pme_order
= pme
->pme_order
;
316 snew(atc
->node_dest
, atc
->nslab
);
317 snew(atc
->node_src
, atc
->nslab
);
318 setup_coordinate_communication(atc
);
320 snew(atc
->count_thread
, pme
->nthread
);
321 for (thread
= 0; thread
< pme
->nthread
; thread
++)
323 snew(atc
->count_thread
[thread
], atc
->nslab
);
325 atc
->count
= atc
->count_thread
[0];
326 snew(atc
->rcount
, atc
->nslab
);
327 snew(atc
->buf_index
, atc
->nslab
);
330 atc
->nthread
= pme
->nthread
;
331 if (atc
->nthread
> 1)
333 snew(atc
->thread_plist
, atc
->nthread
);
335 snew(atc
->spline
, atc
->nthread
);
336 for (thread
= 0; thread
< atc
->nthread
; thread
++)
338 if (atc
->nthread
> 1)
340 snew(atc
->thread_plist
[thread
].n
, atc
->nthread
+2*gmxCacheLineSize
);
341 atc
->thread_plist
[thread
].n
+= gmxCacheLineSize
;
346 /*! \brief Destroy an atom communication data structure and its child structs */
347 static void destroy_atomcomm(pme_atomcomm_t
*atc
)
352 sfree(atc
->node_dest
);
353 sfree(atc
->node_src
);
354 for (int i
= 0; i
< atc
->nthread
; i
++)
356 sfree(atc
->count_thread
[i
]);
358 sfree(atc
->count_thread
);
360 sfree(atc
->buf_index
);
363 sfree(atc
->coefficient
);
369 sfree(atc
->thread_idx
);
370 for (int i
= 0; i
< atc
->nthread
; i
++)
372 if (atc
->nthread
> 1)
374 int *n_ptr
= atc
->thread_plist
[i
].n
- gmxCacheLineSize
;
376 sfree(atc
->thread_plist
[i
].i
);
378 sfree(atc
->spline
[i
].ind
);
379 for (int d
= 0; d
< ZZ
; d
++)
381 sfree(atc
->spline
[i
].theta
[d
]);
382 sfree(atc
->spline
[i
].dtheta
[d
]);
384 sfree_aligned(atc
->spline
[i
].ptr_dtheta_z
);
385 sfree_aligned(atc
->spline
[i
].ptr_theta_z
);
387 if (atc
->nthread
> 1)
389 sfree(atc
->thread_plist
);
394 /*! \brief Initialize data structure for communication */
396 init_overlap_comm(pme_overlap_t
* ol
,
416 /* Linear translation of the PME grid won't affect reciprocal space
417 * calculations, so to optimize we only interpolate "upwards",
418 * which also means we only have to consider overlap in one direction.
419 * I.e., particles on this node might also be spread to grid indices
420 * that belong to higher nodes (modulo nnodes)
423 ol
->s2g0
.resize(ol
->nnodes
+ 1);
424 ol
->s2g1
.resize(ol
->nnodes
);
427 fprintf(debug
, "PME slab boundaries:");
429 for (int i
= 0; i
< nnodes
; i
++)
431 /* s2g0 the local interpolation grid start.
432 * s2g1 the local interpolation grid end.
433 * Since in calc_pidx we divide particles, and not grid lines,
434 * spatially uniform along dimension x or y, we need to round
435 * s2g0 down and s2g1 up.
437 ol
->s2g0
[i
] = (i
* ndata
+ 0) / nnodes
;
438 ol
->s2g1
[i
] = ((i
+ 1) * ndata
+ nnodes
- 1) / nnodes
+ norder
- 1;
442 fprintf(debug
, " %3d %3d", ol
->s2g0
[i
], ol
->s2g1
[i
]);
445 ol
->s2g0
[nnodes
] = ndata
;
448 fprintf(debug
, "\n");
451 /* Determine with how many nodes we need to communicate the grid overlap */
452 int testRankCount
= 0;
457 for (int i
= 0; i
< nnodes
; i
++)
459 if ((i
+ testRankCount
< nnodes
&& ol
->s2g1
[i
] > ol
->s2g0
[i
+ testRankCount
]) ||
460 (i
+ testRankCount
>= nnodes
&& ol
->s2g1
[i
] > ol
->s2g0
[i
+ testRankCount
- nnodes
] + ndata
))
466 while (bCont
&& testRankCount
< nnodes
);
468 ol
->comm_data
.resize(testRankCount
- 1);
471 for (size_t b
= 0; b
< ol
->comm_data
.size(); b
++)
473 pme_grid_comm_t
*pgc
= &ol
->comm_data
[b
];
476 pgc
->send_id
= (ol
->nodeid
+ (b
+ 1)) % ol
->nnodes
;
477 int fft_start
= ol
->s2g0
[pgc
->send_id
];
478 int fft_end
= ol
->s2g0
[pgc
->send_id
+ 1];
479 if (pgc
->send_id
< nodeid
)
484 int send_index1
= ol
->s2g1
[nodeid
];
485 send_index1
= std::min(send_index1
, fft_end
);
486 pgc
->send_index0
= fft_start
;
487 pgc
->send_nindex
= std::max(0, send_index1
- pgc
->send_index0
);
488 ol
->send_size
+= pgc
->send_nindex
;
490 /* We always start receiving to the first index of our slab */
491 pgc
->recv_id
= (ol
->nodeid
- (b
+ 1) + ol
->nnodes
) % ol
->nnodes
;
492 fft_start
= ol
->s2g0
[ol
->nodeid
];
493 fft_end
= ol
->s2g0
[ol
->nodeid
+ 1];
494 int recv_index1
= ol
->s2g1
[pgc
->recv_id
];
495 if (pgc
->recv_id
> nodeid
)
497 recv_index1
-= ndata
;
499 recv_index1
= std::min(recv_index1
, fft_end
);
500 pgc
->recv_index0
= fft_start
;
501 pgc
->recv_nindex
= std::max(0, recv_index1
- pgc
->recv_index0
);
505 /* Communicate the buffer sizes to receive */
506 for (size_t b
= 0; b
< ol
->comm_data
.size(); b
++)
508 MPI_Sendrecv(&ol
->send_size
, 1, MPI_INT
, ol
->comm_data
[b
].send_id
, b
,
509 &ol
->comm_data
[b
].recv_size
, 1, MPI_INT
, ol
->comm_data
[b
].recv_id
, b
,
510 ol
->mpi_comm
, &stat
);
514 /* For non-divisible grid we need pme_order iso pme_order-1 */
515 ol
->sendbuf
.resize(norder
* commplainsize
);
516 ol
->recvbuf
.resize(norder
* commplainsize
);
519 int minimalPmeGridSize(int pmeOrder
)
521 /* The actual grid size limitations are:
522 * serial: >= pme_order
523 * DD, no OpenMP: >= 2*(pme_order - 1)
524 * DD, OpenMP: >= pme_order + 1
525 * But we use the maximum for simplicity since in practice there is not
526 * much performance difference between pme_order and 2*(pme_order -1).
528 int minimalSize
= 2*(pmeOrder
- 1);
530 GMX_RELEASE_ASSERT(pmeOrder
>= 3, "pmeOrder has to be >= 3");
531 GMX_RELEASE_ASSERT(minimalSize
>= pmeOrder
+ 1, "The grid size should be >= pmeOrder + 1");
536 bool gmx_pme_check_restrictions(int pme_order
,
537 int nkx
, int nky
, int nkz
,
538 int numPmeDomainsAlongX
,
542 if (pme_order
> PME_ORDER_MAX
)
549 std::string message
= gmx::formatString(
550 "pme_order (%d) is larger than the maximum allowed value (%d). Modify and recompile the code if you really need such a high order.",
551 pme_order
, PME_ORDER_MAX
);
552 GMX_THROW(InconsistentInputError(message
));
555 const int minGridSize
= minimalPmeGridSize(pme_order
);
556 if (nkx
< minGridSize
||
564 std::string message
= gmx::formatString(
565 "The PME grid sizes need to be >= 2*(pme_order-1) (%d)",
567 GMX_THROW(InconsistentInputError(message
));
570 /* Check for a limitation of the (current) sum_fftgrid_dd code.
571 * We only allow multiple communication pulses in dim 1, not in dim 0.
573 if (useThreads
&& (nkx
< numPmeDomainsAlongX
*pme_order
&&
574 nkx
!= numPmeDomainsAlongX
*(pme_order
- 1)))
580 gmx_fatal(FARGS
, "The number of PME grid lines per rank along x is %g. But when using OpenMP threads, the number of grid lines per rank along x should be >= pme_order (%d) or = pmeorder-1. To resolve this issue, use fewer ranks along x (and possibly more along y and/or z) by specifying -dd manually.",
581 nkx
/static_cast<double>(numPmeDomainsAlongX
), pme_order
);
587 /*! \brief Round \p enumerator */
588 static int div_round_up(int enumerator
, int denominator
)
590 return (enumerator
+ denominator
- 1)/denominator
;
593 gmx_pme_t
*gmx_pme_init(const t_commrec
*cr
,
594 const NumPmeDomains
&numPmeDomains
,
595 const t_inputrec
*ir
,
597 gmx_bool bFreeEnergy_q
,
598 gmx_bool bFreeEnergy_lj
,
599 gmx_bool bReproducible
,
605 gmx_device_info_t
*gpuInfo
,
606 const gmx::MDLogger
& /*mdlog*/)
608 int use_threads
, sum_use_threads
, i
;
613 fprintf(debug
, "Creating PME data structures.\n");
616 unique_cptr
<gmx_pme_t
, gmx_pme_destroy
> pme(new gmx_pme_t());
618 pme
->sum_qgrid_tmp
= nullptr;
619 pme
->sum_qgrid_dd_tmp
= nullptr;
626 pme
->nnodes_major
= numPmeDomains
.x
;
627 pme
->nnodes_minor
= numPmeDomains
.y
;
630 if (numPmeDomains
.x
*numPmeDomains
.y
> 1)
632 pme
->mpi_comm
= cr
->mpi_comm_mygroup
;
634 MPI_Comm_rank(pme
->mpi_comm
, &pme
->nodeid
);
635 MPI_Comm_size(pme
->mpi_comm
, &pme
->nnodes
);
636 if (pme
->nnodes
!= numPmeDomains
.x
*numPmeDomains
.y
)
638 gmx_incons("PME rank count mismatch");
643 pme
->mpi_comm
= MPI_COMM_NULL
;
647 if (pme
->nnodes
== 1)
650 pme
->mpi_comm_d
[0] = MPI_COMM_NULL
;
651 pme
->mpi_comm_d
[1] = MPI_COMM_NULL
;
654 pme
->nodeid_major
= 0;
655 pme
->nodeid_minor
= 0;
657 pme
->mpi_comm_d
[0] = pme
->mpi_comm_d
[1] = MPI_COMM_NULL
;
662 if (numPmeDomains
.y
== 1)
665 pme
->mpi_comm_d
[0] = pme
->mpi_comm
;
666 pme
->mpi_comm_d
[1] = MPI_COMM_NULL
;
669 pme
->nodeid_major
= pme
->nodeid
;
670 pme
->nodeid_minor
= 0;
673 else if (numPmeDomains
.x
== 1)
676 pme
->mpi_comm_d
[0] = MPI_COMM_NULL
;
677 pme
->mpi_comm_d
[1] = pme
->mpi_comm
;
680 pme
->nodeid_major
= 0;
681 pme
->nodeid_minor
= pme
->nodeid
;
685 if (pme
->nnodes
% numPmeDomains
.x
!= 0)
687 gmx_incons("For 2D PME decomposition, #PME ranks must be divisible by the number of domains along x");
692 MPI_Comm_split(pme
->mpi_comm
, pme
->nodeid
% numPmeDomains
.y
,
693 pme
->nodeid
, &pme
->mpi_comm_d
[0]); /* My communicator along major dimension */
694 MPI_Comm_split(pme
->mpi_comm
, pme
->nodeid
/numPmeDomains
.y
,
695 pme
->nodeid
, &pme
->mpi_comm_d
[1]); /* My communicator along minor dimension */
697 MPI_Comm_rank(pme
->mpi_comm_d
[0], &pme
->nodeid_major
);
698 MPI_Comm_size(pme
->mpi_comm_d
[0], &pme
->nnodes_major
);
699 MPI_Comm_rank(pme
->mpi_comm_d
[1], &pme
->nodeid_minor
);
700 MPI_Comm_size(pme
->mpi_comm_d
[1], &pme
->nnodes_minor
);
703 pme
->bPPnode
= thisRankHasDuty(cr
, DUTY_PP
);
706 pme
->nthread
= nthread
;
708 /* Check if any of the PME MPI ranks uses threads */
709 use_threads
= (pme
->nthread
> 1 ? 1 : 0);
713 MPI_Allreduce(&use_threads
, &sum_use_threads
, 1, MPI_INT
,
714 MPI_SUM
, pme
->mpi_comm
);
719 sum_use_threads
= use_threads
;
721 pme
->bUseThreads
= (sum_use_threads
> 0);
723 if (ir
->ePBC
== epbcSCREW
)
725 gmx_fatal(FARGS
, "pme does not (yet) work with pbc = screw");
729 * It is likely that the current gmx_pme_do() routine supports calculating
730 * only Coulomb or LJ while gmx_pme_init() configures for both,
731 * but that has never been tested.
732 * It is likely that the current gmx_pme_do() routine supports calculating,
733 * not calculating free-energy for Coulomb and/or LJ while gmx_pme_init()
734 * configures with free-energy, but that has never been tested.
736 pme
->doCoulomb
= EEL_PME(ir
->coulombtype
);
737 pme
->doLJ
= EVDW_PME(ir
->vdwtype
);
738 pme
->bFEP_q
= ((ir
->efep
!= efepNO
) && bFreeEnergy_q
);
739 pme
->bFEP_lj
= ((ir
->efep
!= efepNO
) && bFreeEnergy_lj
);
740 pme
->bFEP
= (pme
->bFEP_q
|| pme
->bFEP_lj
);
744 pme
->bP3M
= (ir
->coulombtype
== eelP3M_AD
|| getenv("GMX_PME_P3M") != nullptr);
745 pme
->pme_order
= ir
->pme_order
;
746 pme
->ewaldcoeff_q
= ewaldcoeff_q
;
747 pme
->ewaldcoeff_lj
= ewaldcoeff_lj
;
749 /* Always constant electrostatics coefficients */
750 pme
->epsilon_r
= ir
->epsilon_r
;
752 /* Always constant LJ coefficients */
753 pme
->ljpme_combination_rule
= ir
->ljpme_combination_rule
;
755 // The box requires scaling with nwalls = 2, we store that condition as well
756 // as the scaling factor
757 delete pme
->boxScaler
;
758 pme
->boxScaler
= new EwaldBoxZScaler(*ir
);
760 /* If we violate restrictions, generate a fatal error here */
761 gmx_pme_check_restrictions(pme
->pme_order
,
762 pme
->nkx
, pme
->nky
, pme
->nkz
,
772 MPI_Type_contiguous(DIM
, GMX_MPI_REAL
, &(pme
->rvec_mpi
));
773 MPI_Type_commit(&(pme
->rvec_mpi
));
776 /* Note that the coefficient spreading and force gathering, which usually
777 * takes about the same amount of time as FFT+solve_pme,
778 * is always fully load balanced
779 * (unless the coefficient distribution is inhomogeneous).
782 imbal
= estimate_pme_load_imbalance(pme
.get());
783 if (imbal
>= 1.2 && pme
->nodeid_major
== 0 && pme
->nodeid_minor
== 0)
787 "NOTE: The load imbalance in PME FFT and solve is %d%%.\n"
788 " For optimal PME load balancing\n"
789 " PME grid_x (%d) and grid_y (%d) should be divisible by #PME_ranks_x (%d)\n"
790 " and PME grid_y (%d) and grid_z (%d) should be divisible by #PME_ranks_y (%d)\n"
792 (int)((imbal
-1)*100 + 0.5),
793 pme
->nkx
, pme
->nky
, pme
->nnodes_major
,
794 pme
->nky
, pme
->nkz
, pme
->nnodes_minor
);
798 /* For non-divisible grid we need pme_order iso pme_order-1 */
799 /* In sum_qgrid_dd x overlap is copied in place: take padding into account.
800 * y is always copied through a buffer: we don't need padding in z,
801 * but we do need the overlap in x because of the communication order.
803 init_overlap_comm(&pme
->overlap
[0], pme
->pme_order
,
807 pme
->nnodes_major
, pme
->nodeid_major
,
809 (div_round_up(pme
->nky
, pme
->nnodes_minor
)+pme
->pme_order
)*(pme
->nkz
+pme
->pme_order
-1));
811 /* Along overlap dim 1 we can send in multiple pulses in sum_fftgrid_dd.
812 * We do this with an offset buffer of equal size, so we need to allocate
813 * extra for the offset. That's what the (+1)*pme->nkz is for.
815 init_overlap_comm(&pme
->overlap
[1], pme
->pme_order
,
819 pme
->nnodes_minor
, pme
->nodeid_minor
,
821 (div_round_up(pme
->nkx
, pme
->nnodes_major
)+pme
->pme_order
+1)*pme
->nkz
);
823 /* Double-check for a limitation of the (current) sum_fftgrid_dd code.
824 * Note that gmx_pme_check_restrictions checked for this already.
826 if (pme
->bUseThreads
&& (pme
->overlap
[0].comm_data
.size() > 1))
828 gmx_incons("More than one communication pulse required for grid overlap communication along the major dimension while using threads");
831 snew(pme
->bsp_mod
[XX
], pme
->nkx
);
832 snew(pme
->bsp_mod
[YY
], pme
->nky
);
833 snew(pme
->bsp_mod
[ZZ
], pme
->nkz
);
835 pme
->gpu
= pmeGpu
; /* Carrying over the single GPU structure */
836 pme
->runMode
= runMode
;
838 /* The required size of the interpolation grid, including overlap.
839 * The allocated size (pmegrid_n?) might be slightly larger.
841 pme
->pmegrid_nx
= pme
->overlap
[0].s2g1
[pme
->nodeid_major
] -
842 pme
->overlap
[0].s2g0
[pme
->nodeid_major
];
843 pme
->pmegrid_ny
= pme
->overlap
[1].s2g1
[pme
->nodeid_minor
] -
844 pme
->overlap
[1].s2g0
[pme
->nodeid_minor
];
845 pme
->pmegrid_nz_base
= pme
->nkz
;
846 pme
->pmegrid_nz
= pme
->pmegrid_nz_base
+ pme
->pme_order
- 1;
847 set_grid_alignment(&pme
->pmegrid_nz
, pme
->pme_order
);
848 pme
->pmegrid_start_ix
= pme
->overlap
[0].s2g0
[pme
->nodeid_major
];
849 pme
->pmegrid_start_iy
= pme
->overlap
[1].s2g0
[pme
->nodeid_minor
];
850 pme
->pmegrid_start_iz
= 0;
852 make_gridindex_to_localindex(pme
->nkx
,
853 pme
->pmegrid_start_ix
,
854 pme
->pmegrid_nx
- (pme
->pme_order
-1),
855 &pme
->nnx
, &pme
->fshx
);
856 make_gridindex_to_localindex(pme
->nky
,
857 pme
->pmegrid_start_iy
,
858 pme
->pmegrid_ny
- (pme
->pme_order
-1),
859 &pme
->nny
, &pme
->fshy
);
860 make_gridindex_to_localindex(pme
->nkz
,
861 pme
->pmegrid_start_iz
,
862 pme
->pmegrid_nz_base
,
863 &pme
->nnz
, &pme
->fshz
);
865 pme
->spline_work
= make_pme_spline_work(pme
->pme_order
);
870 /* It doesn't matter if we allocate too many grids here,
871 * we only allocate and use the ones we need.
875 pme
->ngrids
= ((ir
->ljpme_combination_rule
== eljpmeLB
) ? DO_Q_AND_LJ_LB
: DO_Q_AND_LJ
);
881 snew(pme
->fftgrid
, pme
->ngrids
);
882 snew(pme
->cfftgrid
, pme
->ngrids
);
883 snew(pme
->pfft_setup
, pme
->ngrids
);
885 for (i
= 0; i
< pme
->ngrids
; ++i
)
887 if ((i
< DO_Q
&& pme
->doCoulomb
&& (i
== 0 ||
889 (i
>= DO_Q
&& pme
->doLJ
&& (i
== 2 ||
891 ir
->ljpme_combination_rule
== eljpmeLB
)))
893 pmegrids_init(&pme
->pmegrid
[i
],
894 pme
->pmegrid_nx
, pme
->pmegrid_ny
, pme
->pmegrid_nz
,
895 pme
->pmegrid_nz_base
,
899 pme
->overlap
[0].s2g1
[pme
->nodeid_major
]-pme
->overlap
[0].s2g0
[pme
->nodeid_major
+1],
900 pme
->overlap
[1].s2g1
[pme
->nodeid_minor
]-pme
->overlap
[1].s2g0
[pme
->nodeid_minor
+1]);
901 /* This routine will allocate the grid data to fit the FFTs */
902 const auto allocateRealGridForGpu
= (pme
->runMode
== PmeRunMode::Mixed
) ? gmx::PinningPolicy::CanBePinned
: gmx::PinningPolicy::CannotBePinned
;
903 gmx_parallel_3dfft_init(&pme
->pfft_setup
[i
], ndata
,
904 &pme
->fftgrid
[i
], &pme
->cfftgrid
[i
],
906 bReproducible
, pme
->nthread
, allocateRealGridForGpu
);
913 /* Use plain SPME B-spline interpolation */
914 make_bspline_moduli(pme
->bsp_mod
, pme
->nkx
, pme
->nky
, pme
->nkz
, pme
->pme_order
);
918 /* Use the P3M grid-optimized influence function */
919 make_p3m_bspline_moduli(pme
->bsp_mod
, pme
->nkx
, pme
->nky
, pme
->nkz
, pme
->pme_order
);
922 /* Use atc[0] for spreading */
923 init_atomcomm(pme
.get(), &pme
->atc
[0], numPmeDomains
.x
> 1 ? 0 : 1, TRUE
);
924 if (pme
->ndecompdim
>= 2)
926 init_atomcomm(pme
.get(), &pme
->atc
[1], 1, FALSE
);
929 if (pme
->nnodes
== 1)
931 pme
->atc
[0].n
= homenr
;
932 pme_realloc_atomcomm_things(&pme
->atc
[0]);
935 pme
->lb_buf1
= nullptr;
936 pme
->lb_buf2
= nullptr;
937 pme
->lb_buf_nalloc
= 0;
939 if (pme_gpu_active(pme
.get()))
943 // Initial check of validity of the data
944 std::string errorString
;
945 bool canRunOnGpu
= pme_gpu_check_restrictions(pme
.get(), &errorString
);
948 GMX_THROW(gmx::NotImplementedError(errorString
));
952 pme_gpu_reinit(pme
.get(), gpuInfo
);
955 pme_init_all_work(&pme
->solve_work
, pme
->nthread
, pme
->nkx
);
957 // no exception was thrown during the init, so we hand over the PME structure handle
958 return pme
.release();
961 void gmx_pme_reinit(struct gmx_pme_t
**pmedata
,
963 struct gmx_pme_t
* pme_src
,
964 const t_inputrec
* ir
,
965 const ivec grid_size
,
971 // Create a copy of t_inputrec fields that are used in gmx_pme_init().
972 // TODO: This would be better as just copying a sub-structure that contains
973 // all the PME parameters and nothing else.
976 irc
.coulombtype
= ir
->coulombtype
;
977 irc
.vdwtype
= ir
->vdwtype
;
979 irc
.pme_order
= ir
->pme_order
;
980 irc
.epsilon_r
= ir
->epsilon_r
;
981 irc
.ljpme_combination_rule
= ir
->ljpme_combination_rule
;
982 irc
.nkx
= grid_size
[XX
];
983 irc
.nky
= grid_size
[YY
];
984 irc
.nkz
= grid_size
[ZZ
];
986 if (pme_src
->nnodes
== 1)
988 homenr
= pme_src
->atc
[0].n
;
997 const gmx::MDLogger dummyLogger
;
998 // This is reinit which is currently only changing grid size/coefficients,
999 // so we don't expect the actual logging.
1000 // TODO: when PME is an object, it should take reference to mdlog on construction and save it.
1001 GMX_ASSERT(pmedata
, "Invalid PME pointer");
1002 NumPmeDomains numPmeDomains
= { pme_src
->nnodes_major
, pme_src
->nnodes_minor
};
1003 *pmedata
= gmx_pme_init(cr
, numPmeDomains
,
1004 &irc
, homenr
, pme_src
->bFEP_q
, pme_src
->bFEP_lj
, FALSE
, ewaldcoeff_q
, ewaldcoeff_lj
,
1005 pme_src
->nthread
, pme_src
->runMode
, pme_src
->gpu
, nullptr, dummyLogger
);
1006 //TODO this is mostly passing around current values
1008 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1010 /* We can easily reuse the allocated pme grids in pme_src */
1011 reuse_pmegrids(&pme_src
->pmegrid
[PME_GRID_QA
], &(*pmedata
)->pmegrid
[PME_GRID_QA
]);
1012 /* We would like to reuse the fft grids, but that's harder */
1015 void gmx_pme_calc_energy(struct gmx_pme_t
*pme
, int n
, rvec
*x
, real
*q
, real
*V
)
1017 pme_atomcomm_t
*atc
;
1020 if (pme
->nnodes
> 1)
1022 gmx_incons("gmx_pme_calc_energy called in parallel");
1024 if (pme
->bFEP_q
> 1)
1026 gmx_incons("gmx_pme_calc_energy with free energy");
1029 atc
= &pme
->atc_energy
;
1031 if (atc
->spline
== nullptr)
1033 snew(atc
->spline
, atc
->nthread
);
1036 atc
->bSpread
= TRUE
;
1037 atc
->pme_order
= pme
->pme_order
;
1039 pme_realloc_atomcomm_things(atc
);
1041 atc
->coefficient
= q
;
1043 /* We only use the A-charges grid */
1044 grid
= &pme
->pmegrid
[PME_GRID_QA
];
1046 /* Only calculate the spline coefficients, don't actually spread */
1047 spread_on_grid(pme
, atc
, nullptr, TRUE
, FALSE
, pme
->fftgrid
[PME_GRID_QA
], FALSE
, PME_GRID_QA
);
1049 *V
= gather_energy_bsplines(pme
, grid
->grid
.grid
, atc
);
1052 /*! \brief Calculate initial Lorentz-Berthelot coefficients for LJ-PME */
1054 calc_initial_lb_coeffs(struct gmx_pme_t
*pme
, real
*local_c6
, real
*local_sigma
)
1057 for (i
= 0; i
< pme
->atc
[0].n
; ++i
)
1060 sigma4
= local_sigma
[i
];
1061 sigma4
= sigma4
*sigma4
;
1062 sigma4
= sigma4
*sigma4
;
1063 pme
->atc
[0].coefficient
[i
] = local_c6
[i
] / sigma4
;
1067 /*! \brief Calculate next Lorentz-Berthelot coefficients for LJ-PME */
1069 calc_next_lb_coeffs(struct gmx_pme_t
*pme
, real
*local_sigma
)
1073 for (i
= 0; i
< pme
->atc
[0].n
; ++i
)
1075 pme
->atc
[0].coefficient
[i
] *= local_sigma
[i
];
1079 int gmx_pme_do(struct gmx_pme_t
*pme
,
1080 int start
, int homenr
,
1082 real chargeA
[], real chargeB
[],
1083 real c6A
[], real c6B
[],
1084 real sigmaA
[], real sigmaB
[],
1085 matrix box
, const t_commrec
*cr
,
1086 int maxshift_x
, int maxshift_y
,
1087 t_nrnb
*nrnb
, gmx_wallcycle
*wcycle
,
1088 matrix vir_q
, matrix vir_lj
,
1089 real
*energy_q
, real
*energy_lj
,
1090 real lambda_q
, real lambda_lj
,
1091 real
*dvdlambda_q
, real
*dvdlambda_lj
,
1094 GMX_ASSERT(pme
->runMode
== PmeRunMode::CPU
, "gmx_pme_do should not be called on the GPU PME run.");
1096 int d
, i
, j
, npme
, grid_index
, max_grid_index
;
1098 pme_atomcomm_t
*atc
= nullptr;
1099 pmegrids_t
*pmegrid
= nullptr;
1100 real
*grid
= nullptr;
1102 real
*coefficient
= nullptr;
1107 gmx_parallel_3dfft_t pfft_setup
;
1109 t_complex
* cfftgrid
;
1111 gmx_bool bFirst
, bDoSplines
;
1113 int fep_states_lj
= pme
->bFEP_lj
? 2 : 1;
1114 const gmx_bool bCalcEnerVir
= flags
& GMX_PME_CALC_ENER_VIR
;
1115 const gmx_bool bBackFFT
= flags
& (GMX_PME_CALC_F
| GMX_PME_CALC_POT
);
1116 const gmx_bool bCalcF
= flags
& GMX_PME_CALC_F
;
1118 assert(pme
->nnodes
> 0);
1119 assert(pme
->nnodes
== 1 || pme
->ndecompdim
> 0);
1121 if (pme
->nnodes
> 1)
1125 if (atc
->npd
> atc
->pd_nalloc
)
1127 atc
->pd_nalloc
= over_alloc_dd(atc
->npd
);
1128 srenew(atc
->pd
, atc
->pd_nalloc
);
1130 for (d
= pme
->ndecompdim
-1; d
>= 0; d
--)
1133 atc
->maxshift
= (atc
->dimind
== 0 ? maxshift_x
: maxshift_y
);
1139 /* This could be necessary for TPI */
1140 pme
->atc
[0].n
= homenr
;
1141 if (DOMAINDECOMP(cr
))
1143 pme_realloc_atomcomm_things(atc
);
1150 pme
->boxScaler
->scaleBox(box
, scaledBox
);
1152 gmx::invertBoxMatrix(scaledBox
, pme
->recipbox
);
1155 /* For simplicity, we construct the splines for all particles if
1156 * more than one PME calculations is needed. Some optimization
1157 * could be done by keeping track of which atoms have splines
1158 * constructed, and construct new splines on each pass for atoms
1159 * that don't yet have them.
1162 bDoSplines
= pme
->bFEP
|| (pme
->doCoulomb
&& pme
->doLJ
);
1164 /* We need a maximum of four separate PME calculations:
1165 * grid_index=0: Coulomb PME with charges from state A
1166 * grid_index=1: Coulomb PME with charges from state B
1167 * grid_index=2: LJ PME with C6 from state A
1168 * grid_index=3: LJ PME with C6 from state B
1169 * For Lorentz-Berthelot combination rules, a separate loop is used to
1170 * calculate all the terms
1173 /* If we are doing LJ-PME with LB, we only do Q here */
1174 max_grid_index
= (pme
->ljpme_combination_rule
== eljpmeLB
) ? DO_Q
: DO_Q_AND_LJ
;
1176 for (grid_index
= 0; grid_index
< max_grid_index
; ++grid_index
)
1178 /* Check if we should do calculations at this grid_index
1179 * If grid_index is odd we should be doing FEP
1180 * If grid_index < 2 we should be doing electrostatic PME
1181 * If grid_index >= 2 we should be doing LJ-PME
1183 if ((grid_index
< DO_Q
&& (!pme
->doCoulomb
||
1184 (grid_index
== 1 && !pme
->bFEP_q
))) ||
1185 (grid_index
>= DO_Q
&& (!pme
->doLJ
||
1186 (grid_index
== 3 && !pme
->bFEP_lj
))))
1190 /* Unpack structure */
1191 pmegrid
= &pme
->pmegrid
[grid_index
];
1192 fftgrid
= pme
->fftgrid
[grid_index
];
1193 cfftgrid
= pme
->cfftgrid
[grid_index
];
1194 pfft_setup
= pme
->pfft_setup
[grid_index
];
1197 case 0: coefficient
= chargeA
+ start
; break;
1198 case 1: coefficient
= chargeB
+ start
; break;
1199 case 2: coefficient
= c6A
+ start
; break;
1200 case 3: coefficient
= c6B
+ start
; break;
1203 grid
= pmegrid
->grid
.grid
;
1207 fprintf(debug
, "PME: number of ranks = %d, rank = %d\n",
1208 cr
->nnodes
, cr
->nodeid
);
1209 fprintf(debug
, "Grid = %p\n", (void*)grid
);
1210 if (grid
== nullptr)
1212 gmx_fatal(FARGS
, "No grid!");
1216 if (pme
->nnodes
== 1)
1218 atc
->coefficient
= coefficient
;
1222 wallcycle_start(wcycle
, ewcPME_REDISTXF
);
1223 do_redist_pos_coeffs(pme
, cr
, start
, homenr
, bFirst
, x
, coefficient
);
1225 wallcycle_stop(wcycle
, ewcPME_REDISTXF
);
1230 fprintf(debug
, "Rank= %6d, pme local particles=%6d\n",
1231 cr
->nodeid
, atc
->n
);
1234 if (flags
& GMX_PME_SPREAD
)
1236 wallcycle_start(wcycle
, ewcPME_SPREAD
);
1238 /* Spread the coefficients on a grid */
1239 spread_on_grid(pme
, &pme
->atc
[0], pmegrid
, bFirst
, TRUE
, fftgrid
, bDoSplines
, grid_index
);
1243 inc_nrnb(nrnb
, eNR_WEIGHTS
, DIM
*atc
->n
);
1245 inc_nrnb(nrnb
, eNR_SPREADBSP
,
1246 pme
->pme_order
*pme
->pme_order
*pme
->pme_order
*atc
->n
);
1248 if (!pme
->bUseThreads
)
1250 wrap_periodic_pmegrid(pme
, grid
);
1252 /* sum contributions to local grid from other nodes */
1254 if (pme
->nnodes
> 1)
1256 gmx_sum_qgrid_dd(pme
, grid
, GMX_SUM_GRID_FORWARD
);
1260 copy_pmegrid_to_fftgrid(pme
, grid
, fftgrid
, grid_index
);
1263 wallcycle_stop(wcycle
, ewcPME_SPREAD
);
1265 /* TODO If the OpenMP and single-threaded implementations
1266 converge, then spread_on_grid() and
1267 copy_pmegrid_to_fftgrid() will perhaps live in the same
1272 /* Here we start a large thread parallel region */
1273 #pragma omp parallel num_threads(pme->nthread) private(thread)
1277 thread
= gmx_omp_get_thread_num();
1278 if (flags
& GMX_PME_SOLVE
)
1285 wallcycle_start(wcycle
, ewcPME_FFT
);
1287 gmx_parallel_3dfft_execute(pfft_setup
, GMX_FFT_REAL_TO_COMPLEX
,
1291 wallcycle_stop(wcycle
, ewcPME_FFT
);
1294 /* solve in k-space for our local cells */
1297 wallcycle_start(wcycle
, (grid_index
< DO_Q
? ewcPME_SOLVE
: ewcLJPME
));
1299 if (grid_index
< DO_Q
)
1302 solve_pme_yzx(pme
, cfftgrid
,
1303 scaledBox
[XX
][XX
]*scaledBox
[YY
][YY
]*scaledBox
[ZZ
][ZZ
],
1305 pme
->nthread
, thread
);
1310 solve_pme_lj_yzx(pme
, &cfftgrid
, FALSE
,
1311 scaledBox
[XX
][XX
]*scaledBox
[YY
][YY
]*scaledBox
[ZZ
][ZZ
],
1313 pme
->nthread
, thread
);
1318 wallcycle_stop(wcycle
, (grid_index
< DO_Q
? ewcPME_SOLVE
: ewcLJPME
));
1319 inc_nrnb(nrnb
, eNR_SOLVEPME
, loop_count
);
1328 wallcycle_start(wcycle
, ewcPME_FFT
);
1330 gmx_parallel_3dfft_execute(pfft_setup
, GMX_FFT_COMPLEX_TO_REAL
,
1334 wallcycle_stop(wcycle
, ewcPME_FFT
);
1337 if (pme
->nodeid
== 0)
1339 real ntot
= pme
->nkx
*pme
->nky
*pme
->nkz
;
1340 npme
= static_cast<int>(ntot
*std::log(ntot
)/std::log(2.0));
1341 inc_nrnb(nrnb
, eNR_FFT
, 2*npme
);
1344 /* Note: this wallcycle region is closed below
1345 outside an OpenMP region, so take care if
1346 refactoring code here. */
1347 wallcycle_start(wcycle
, ewcPME_GATHER
);
1350 copy_fftgrid_to_pmegrid(pme
, fftgrid
, grid
, grid_index
, pme
->nthread
, thread
);
1352 } GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1354 /* End of thread parallel section.
1355 * With MPI we have to synchronize here before gmx_sum_qgrid_dd.
1360 /* distribute local grid to all nodes */
1362 if (pme
->nnodes
> 1)
1364 gmx_sum_qgrid_dd(pme
, grid
, GMX_SUM_GRID_BACKWARD
);
1368 unwrap_periodic_pmegrid(pme
, grid
);
1373 /* interpolate forces for our local atoms */
1376 /* If we are running without parallelization,
1377 * atc->f is the actual force array, not a buffer,
1378 * therefore we should not clear it.
1380 lambda
= grid_index
< DO_Q
? lambda_q
: lambda_lj
;
1381 bClearF
= (bFirst
&& PAR(cr
));
1382 #pragma omp parallel for num_threads(pme->nthread) schedule(static)
1383 for (thread
= 0; thread
< pme
->nthread
; thread
++)
1387 gather_f_bsplines(pme
, grid
, bClearF
, atc
,
1388 &atc
->spline
[thread
],
1389 pme
->bFEP
? (grid_index
% 2 == 0 ? 1.0-lambda
: lambda
) : 1.0);
1391 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1395 inc_nrnb(nrnb
, eNR_GATHERFBSP
,
1396 pme
->pme_order
*pme
->pme_order
*pme
->pme_order
*pme
->atc
[0].n
);
1397 /* Note: this wallcycle region is opened above inside an OpenMP
1398 region, so take care if refactoring code here. */
1399 wallcycle_stop(wcycle
, ewcPME_GATHER
);
1404 /* This should only be called on the master thread
1405 * and after the threads have synchronized.
1409 get_pme_ener_vir_q(pme
->solve_work
, pme
->nthread
, &energy_AB
[grid_index
], vir_AB
[grid_index
]);
1413 get_pme_ener_vir_lj(pme
->solve_work
, pme
->nthread
, &energy_AB
[grid_index
], vir_AB
[grid_index
]);
1417 } /* of grid_index-loop */
1419 /* For Lorentz-Berthelot combination rules in LJ-PME, we need to calculate
1422 if (pme
->doLJ
&& pme
->ljpme_combination_rule
== eljpmeLB
)
1424 /* Loop over A- and B-state if we are doing FEP */
1425 for (fep_state
= 0; fep_state
< fep_states_lj
; ++fep_state
)
1427 real
*local_c6
= nullptr, *local_sigma
= nullptr, *RedistC6
= nullptr, *RedistSigma
= nullptr;
1428 if (pme
->nnodes
== 1)
1430 if (pme
->lb_buf1
== nullptr)
1432 pme
->lb_buf_nalloc
= pme
->atc
[0].n
;
1433 snew(pme
->lb_buf1
, pme
->lb_buf_nalloc
);
1435 pme
->atc
[0].coefficient
= pme
->lb_buf1
;
1440 local_sigma
= sigmaA
;
1444 local_sigma
= sigmaB
;
1447 gmx_incons("Trying to access wrong FEP-state in LJ-PME routine");
1457 RedistSigma
= sigmaA
;
1461 RedistSigma
= sigmaB
;
1464 gmx_incons("Trying to access wrong FEP-state in LJ-PME routine");
1466 wallcycle_start(wcycle
, ewcPME_REDISTXF
);
1468 do_redist_pos_coeffs(pme
, cr
, start
, homenr
, bFirst
, x
, RedistC6
);
1469 if (pme
->lb_buf_nalloc
< atc
->n
)
1471 pme
->lb_buf_nalloc
= atc
->nalloc
;
1472 srenew(pme
->lb_buf1
, pme
->lb_buf_nalloc
);
1473 srenew(pme
->lb_buf2
, pme
->lb_buf_nalloc
);
1475 local_c6
= pme
->lb_buf1
;
1476 for (i
= 0; i
< atc
->n
; ++i
)
1478 local_c6
[i
] = atc
->coefficient
[i
];
1481 do_redist_pos_coeffs(pme
, cr
, start
, homenr
, FALSE
, x
, RedistSigma
);
1482 local_sigma
= pme
->lb_buf2
;
1483 for (i
= 0; i
< atc
->n
; ++i
)
1485 local_sigma
[i
] = atc
->coefficient
[i
];
1488 wallcycle_stop(wcycle
, ewcPME_REDISTXF
);
1490 calc_initial_lb_coeffs(pme
, local_c6
, local_sigma
);
1492 /*Seven terms in LJ-PME with LB, grid_index < 2 reserved for electrostatics*/
1493 for (grid_index
= 2; grid_index
< 9; ++grid_index
)
1495 /* Unpack structure */
1496 pmegrid
= &pme
->pmegrid
[grid_index
];
1497 fftgrid
= pme
->fftgrid
[grid_index
];
1498 pfft_setup
= pme
->pfft_setup
[grid_index
];
1499 calc_next_lb_coeffs(pme
, local_sigma
);
1500 grid
= pmegrid
->grid
.grid
;
1502 if (flags
& GMX_PME_SPREAD
)
1504 wallcycle_start(wcycle
, ewcPME_SPREAD
);
1505 /* Spread the c6 on a grid */
1506 spread_on_grid(pme
, &pme
->atc
[0], pmegrid
, bFirst
, TRUE
, fftgrid
, bDoSplines
, grid_index
);
1510 inc_nrnb(nrnb
, eNR_WEIGHTS
, DIM
*atc
->n
);
1513 inc_nrnb(nrnb
, eNR_SPREADBSP
,
1514 pme
->pme_order
*pme
->pme_order
*pme
->pme_order
*atc
->n
);
1515 if (pme
->nthread
== 1)
1517 wrap_periodic_pmegrid(pme
, grid
);
1518 /* sum contributions to local grid from other nodes */
1520 if (pme
->nnodes
> 1)
1522 gmx_sum_qgrid_dd(pme
, grid
, GMX_SUM_GRID_FORWARD
);
1525 copy_pmegrid_to_fftgrid(pme
, grid
, fftgrid
, grid_index
);
1527 wallcycle_stop(wcycle
, ewcPME_SPREAD
);
1529 /*Here we start a large thread parallel region*/
1530 #pragma omp parallel num_threads(pme->nthread) private(thread)
1534 thread
= gmx_omp_get_thread_num();
1535 if (flags
& GMX_PME_SOLVE
)
1540 wallcycle_start(wcycle
, ewcPME_FFT
);
1543 gmx_parallel_3dfft_execute(pfft_setup
, GMX_FFT_REAL_TO_COMPLEX
,
1547 wallcycle_stop(wcycle
, ewcPME_FFT
);
1551 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1555 if (flags
& GMX_PME_SOLVE
)
1557 /* solve in k-space for our local cells */
1558 #pragma omp parallel num_threads(pme->nthread) private(thread)
1563 thread
= gmx_omp_get_thread_num();
1566 wallcycle_start(wcycle
, ewcLJPME
);
1570 solve_pme_lj_yzx(pme
, &pme
->cfftgrid
[2], TRUE
,
1571 scaledBox
[XX
][XX
]*scaledBox
[YY
][YY
]*scaledBox
[ZZ
][ZZ
],
1573 pme
->nthread
, thread
);
1576 wallcycle_stop(wcycle
, ewcLJPME
);
1577 inc_nrnb(nrnb
, eNR_SOLVEPME
, loop_count
);
1580 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1586 /* This should only be called on the master thread and
1587 * after the threads have synchronized.
1589 get_pme_ener_vir_lj(pme
->solve_work
, pme
->nthread
, &energy_AB
[2+fep_state
], vir_AB
[2+fep_state
]);
1594 bFirst
= !pme
->doCoulomb
;
1595 calc_initial_lb_coeffs(pme
, local_c6
, local_sigma
);
1596 for (grid_index
= 8; grid_index
>= 2; --grid_index
)
1598 /* Unpack structure */
1599 pmegrid
= &pme
->pmegrid
[grid_index
];
1600 fftgrid
= pme
->fftgrid
[grid_index
];
1601 pfft_setup
= pme
->pfft_setup
[grid_index
];
1602 grid
= pmegrid
->grid
.grid
;
1603 calc_next_lb_coeffs(pme
, local_sigma
);
1604 #pragma omp parallel num_threads(pme->nthread) private(thread)
1608 thread
= gmx_omp_get_thread_num();
1612 wallcycle_start(wcycle
, ewcPME_FFT
);
1615 gmx_parallel_3dfft_execute(pfft_setup
, GMX_FFT_COMPLEX_TO_REAL
,
1619 wallcycle_stop(wcycle
, ewcPME_FFT
);
1622 if (pme
->nodeid
== 0)
1624 real ntot
= pme
->nkx
*pme
->nky
*pme
->nkz
;
1625 npme
= static_cast<int>(ntot
*std::log(ntot
)/std::log(2.0));
1626 inc_nrnb(nrnb
, eNR_FFT
, 2*npme
);
1628 wallcycle_start(wcycle
, ewcPME_GATHER
);
1631 copy_fftgrid_to_pmegrid(pme
, fftgrid
, grid
, grid_index
, pme
->nthread
, thread
);
1633 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1634 } /*#pragma omp parallel*/
1636 /* distribute local grid to all nodes */
1638 if (pme
->nnodes
> 1)
1640 gmx_sum_qgrid_dd(pme
, grid
, GMX_SUM_GRID_BACKWARD
);
1644 unwrap_periodic_pmegrid(pme
, grid
);
1648 /* interpolate forces for our local atoms */
1649 bClearF
= (bFirst
&& PAR(cr
));
1650 scale
= pme
->bFEP
? (fep_state
< 1 ? 1.0-lambda_lj
: lambda_lj
) : 1.0;
1651 scale
*= lb_scale_factor
[grid_index
-2];
1653 #pragma omp parallel for num_threads(pme->nthread) schedule(static)
1654 for (thread
= 0; thread
< pme
->nthread
; thread
++)
1658 gather_f_bsplines(pme
, grid
, bClearF
, &pme
->atc
[0],
1659 &pme
->atc
[0].spline
[thread
],
1662 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
;
1666 inc_nrnb(nrnb
, eNR_GATHERFBSP
,
1667 pme
->pme_order
*pme
->pme_order
*pme
->pme_order
*pme
->atc
[0].n
);
1669 wallcycle_stop(wcycle
, ewcPME_GATHER
);
1672 } /* for (grid_index = 8; grid_index >= 2; --grid_index) */
1674 } /* for (fep_state = 0; fep_state < fep_states_lj; ++fep_state) */
1675 } /* if ((flags & GMX_PME_DO_LJ) && pme->ljpme_combination_rule == eljpmeLB) */
1677 if (bCalcF
&& pme
->nnodes
> 1)
1679 wallcycle_start(wcycle
, ewcPME_REDISTXF
);
1680 for (d
= 0; d
< pme
->ndecompdim
; d
++)
1683 if (d
== pme
->ndecompdim
- 1)
1690 n_d
= pme
->atc
[d
+1].n
;
1691 f_d
= pme
->atc
[d
+1].f
;
1693 if (DOMAINDECOMP(cr
))
1695 dd_pmeredist_f(pme
, atc
, n_d
, f_d
,
1696 d
== pme
->ndecompdim
-1 && pme
->bPPnode
);
1700 wallcycle_stop(wcycle
, ewcPME_REDISTXF
);
1709 *energy_q
= energy_AB
[0];
1710 m_add(vir_q
, vir_AB
[0], vir_q
);
1714 *energy_q
= (1.0-lambda_q
)*energy_AB
[0] + lambda_q
*energy_AB
[1];
1715 *dvdlambda_q
+= energy_AB
[1] - energy_AB
[0];
1716 for (i
= 0; i
< DIM
; i
++)
1718 for (j
= 0; j
< DIM
; j
++)
1720 vir_q
[i
][j
] += (1.0-lambda_q
)*vir_AB
[0][i
][j
] +
1721 lambda_q
*vir_AB
[1][i
][j
];
1727 fprintf(debug
, "Electrostatic PME mesh energy: %g\n", *energy_q
);
1739 *energy_lj
= energy_AB
[2];
1740 m_add(vir_lj
, vir_AB
[2], vir_lj
);
1744 *energy_lj
= (1.0-lambda_lj
)*energy_AB
[2] + lambda_lj
*energy_AB
[3];
1745 *dvdlambda_lj
+= energy_AB
[3] - energy_AB
[2];
1746 for (i
= 0; i
< DIM
; i
++)
1748 for (j
= 0; j
< DIM
; j
++)
1750 vir_lj
[i
][j
] += (1.0-lambda_lj
)*vir_AB
[2][i
][j
] + lambda_lj
*vir_AB
[3][i
][j
];
1756 fprintf(debug
, "Lennard-Jones PME mesh energy: %g\n", *energy_lj
);
1767 void gmx_pme_destroy(gmx_pme_t
*pme
)
1774 delete pme
->boxScaler
;
1783 for (int i
= 0; i
< pme
->ngrids
; ++i
)
1785 pmegrids_destroy(&pme
->pmegrid
[i
]);
1787 if (pme
->pfft_setup
)
1789 for (int i
= 0; i
< pme
->ngrids
; ++i
)
1791 gmx_parallel_3dfft_destroy(pme
->pfft_setup
[i
]);
1794 sfree(pme
->fftgrid
);
1795 sfree(pme
->cfftgrid
);
1796 sfree(pme
->pfft_setup
);
1798 for (int i
= 0; i
< std::max(1, pme
->ndecompdim
); i
++) //pme->atc[0] is always allocated
1800 destroy_atomcomm(&pme
->atc
[i
]);
1803 for (int i
= 0; i
< DIM
; i
++)
1805 sfree(pme
->bsp_mod
[i
]);
1808 sfree(pme
->lb_buf1
);
1809 sfree(pme
->lb_buf2
);
1814 if (pme
->solve_work
)
1816 pme_free_all_work(&pme
->solve_work
, pme
->nthread
);
1819 sfree(pme
->sum_qgrid_tmp
);
1820 sfree(pme
->sum_qgrid_dd_tmp
);
1822 destroy_pme_spline_work(pme
->spline_work
);
1824 if (pme_gpu_active(pme
) && pme
->gpu
)
1826 pme_gpu_destroy(pme
->gpu
);
1832 void gmx_pme_reinit_atoms(const gmx_pme_t
*pme
, const int nAtoms
, const real
*charges
)
1834 if (pme_gpu_active(pme
))
1836 pme_gpu_reinit_atoms(pme
->gpu
, nAtoms
, charges
);
1838 // TODO: handle the CPU case here; handle the whole t_mdatoms