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source: palm/trunk/SOURCE/pmc_server.f90 @ 1763

Last change on this file since 1763 was 1763, checked in by hellstea, 8 years ago
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1	MODULE pmc_server
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2015 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_server.f90 1763 2016-02-25 13:00:19Z hellstea $
27	!
28	! 1762 2016-02-25 12:31:13Z hellstea
29	! Initial revision by K. Ketelsen
30	!
31	! Description:
32	! ------------
33	!
34	! Server part of Palm Model Coupler
35	!------------------------------------------------------------------------------!
36
37	use, intrinsic :: iso_c_binding
38
39	USE mpi
40	USE kinds, ONLY: wp, iwp
41	USE PMC_general, ONLY: ClientDef, PMC_MAX_MODELL,PMC_sort, DA_NameDef, DA_Desclen, DA_Namelen, &
42	PMC_G_SetName, PMC_G_GetName, PeDef, ArrayDef
43	USE PMC_handle_communicator, ONLY: m_model_comm,m_model_rank,m_model_npes, m_to_client_comm, &
44	PMC_Server_for_Client, m_world_rank
45	USE PMC_MPI_wrapper, ONLY: PMC_Send_to_Client, PMC_Recv_from_Client, PMC_Bcast, PMC_Inter_Bcast, &
46	PMC_Alloc_mem, PMC_Time
47
48	IMPLICIT none
49	PRIVATE
50	SAVE
51
52	TYPE ClientIndexDef
53	INTEGER :: NrPoints
54	INTEGER,DIMENSION(:,:),allocatable :: index_list_2d
55	END TYPE ClientIndexDef
56
57	TYPE(ClientDef),DIMENSION(PMC_MAX_MODELL) :: Clients
58	TYPE(ClientIndexDef),DIMENSION(PMC_MAX_MODELL) :: indClients
59
60	PUBLIC PMC_Server_for_Client
61
62	INTEGER, PARAMETER :: dp = wp
63
64	! INTERFACE section
65
66	INTERFACE PMC_ServerInit
67	MODULE procedure PMC_ServerInit
68	END INTERFACE PMC_ServerInit
69
70	INTERFACE PMC_S_Set_2D_index_list
71	MODULE procedure PMC_S_Set_2D_index_list
72	END INTERFACE PMC_S_Set_2D_index_list
73
74	INTERFACE PMC_S_GetNextArray
75	MODULE procedure PMC_S_GetNextArray
76	END INTERFACE PMC_S_GetNextArray
77
78	INTERFACE PMC_S_Set_DataArray
79	MODULE procedure PMC_S_Set_DataArray_2d
80	MODULE procedure PMC_S_Set_DataArray_3d
81	END INTERFACE PMC_S_Set_DataArray
82
83	INTERFACE PMC_S_setInd_and_AllocMem
84	MODULE procedure PMC_S_setInd_and_AllocMem
85	END INTERFACE PMC_S_setInd_and_AllocMem
86
87	INTERFACE PMC_S_FillBuffer
88	MODULE procedure PMC_S_FillBuffer
89	END INTERFACE PMC_S_FillBuffer
90
91	INTERFACE PMC_S_GetData_from_Buffer
92	MODULE procedure PMC_S_GetData_from_Buffer
93	END INTERFACE PMC_S_GetData_from_Buffer
94
95	! PUBLIC section
96
97	PUBLIC PMC_ServerInit, PMC_S_Set_2D_index_list, PMC_S_GetNextArray, PMC_S_Set_DataArray
98	PUBLIC PMC_S_setInd_and_AllocMem, PMC_S_FillBuffer, PMC_S_GetData_from_Buffer
99
100	CONTAINS
101
102	SUBROUTINE PMC_ServerInit
103	IMPLICIT none
104	INTEGER :: i
105	INTEGER :: j
106	INTEGER :: ClientId
107	INTEGER :: istat
108
109	do i=1,size(PMC_Server_for_Client)-1
110	if(m_model_comm == 0) write(0,*) 'PMC_Server: Initialize client Id',PMC_Server_for_Client(i)
111
112	ClientId = PMC_Server_for_Client(i)
113
114	Clients(ClientId)%model_comm = m_model_comm
115	Clients(ClientId)%inter_comm = m_to_client_comm(ClientId)
116
117	! Get rank and size
118	CALL MPI_Comm_rank (Clients(ClientId)%model_comm, Clients(ClientId)%model_rank, istat);
119	CALL MPI_Comm_size (Clients(ClientId)%model_comm, Clients(ClientId)%model_npes, istat);
120	CALL MPI_Comm_remote_size (Clients(ClientId)%inter_comm, Clients(ClientId)%inter_npes, istat);
121
122	! Intra communicater is used for MPI_Get
123	CALL MPI_Intercomm_merge (Clients(ClientId)%inter_comm, .false., Clients(ClientId)%intra_comm, istat);
124	CALL MPI_Comm_rank (Clients(ClientId)%intra_comm, Clients(ClientId)%intra_rank, istat);
125
126	write(9,*) 'ClientId ',i,ClientId,m_world_rank, Clients(ClientId)%inter_npes
127
128	ALLOCATE (Clients(ClientId)%PEs(Clients(ClientId)%inter_npes))
129
130	do j=1,Clients(ClientId)%inter_npes ! Loop over all client PEs
131	NULLIFY(Clients(ClientId)%PEs(j)%Arrays)
132	end do
133
134	CALL Get_DA_names_from_client (ClientId)
135	end do
136
137	return
138	END SUBROUTINE PMC_ServerInit
139
140	SUBROUTINE PMC_S_Set_2D_index_list (ClientId, index_list)
141	IMPLICIT none
142	INTEGER,INTENT(IN) :: ClientId
143	INTEGER,DIMENSION(:,:),INTENT(INOUT) :: index_list !Index list will be modified in sort, therefore INOUT
144
145	!-- Local variables
146	INTEGER :: ip,is,ie,ian,ic,n
147	INTEGER :: istat
148
149	if(m_model_rank == 0) then
150	CALL PMC_sort (index_list, 6) ! Sort to ascending Server PE
151	is = 1
152
153	do ip=0,m_model_npes-1
154
155	! Split into Server PEs
156	ie = is-1 !there may be no entry for this PE
157	if(is <= size(index_list,2) .and. ie >= 0) then
158	do while ( index_list(6,ie+1) == ip)
159	ie = ie+1
160	if( ie == size(index_list,2)) EXIT
161	end do
162
163	ian = ie-is+1
164	else
165	is = -1
166	ie = -2
167	ian = 0
168	end if
169
170	! Send data to other server PEs
171
172	if(ip == 0) then
173	indClients(ClientId)%NrPoints = ian
174	if(ian > 0) then
175	ALLOCATE (indClients(ClientId)%index_list_2d(6,ian))
176	indClients(ClientId)%index_list_2d(:,1:ian) = index_list(:,is:ie)
177	end if
178	else
179	CALL MPI_Send (ian, 1, MPI_INTEGER, ip, 1000, m_model_comm, istat)
180	if(ian > 0) then
181	CALL MPI_Send (index_list(1,is), 6*ian, MPI_INTEGER, ip, 1001, &
182	m_model_comm, istat)
183	end if
184	end if
185	is = ie+1
186	end do
187	else
188	CALL MPI_Recv (indClients(ClientId)%NrPoints, 1, MPI_INTEGER, 0, 1000, m_model_comm, &
189	MPI_STATUS_IGNORE, istat)
190	ian = indClients(ClientId)%NrPoints
191	if(ian > 0) then
192	ALLOCATE(indClients(ClientId)%index_list_2d(6,ian))
193	CALL MPI_RECV (indClients(ClientId)%index_list_2d, 6*ian, MPI_INTEGER, 0, 1001, &
194	m_model_comm, MPI_STATUS_IGNORE, istat)
195	end if
196	end if
197
198	CALL Set_PE_index_list (ClientId,Clients(ClientId),indClients(ClientId)%index_list_2d,indClients(ClientId)%NrPoints)
199
200	return
201	END SUBROUTINE PMC_S_Set_2D_index_list
202
203	logical function PMC_S_GetNextArray (ClientId, myName,Client_PeIndex)
204	INTEGER,INTENT(IN) :: ClientId
205	CHARACTER(len=*),INTENT(OUT) :: myName
206
207	!-- local variables
208	INTEGER :: MyCoupleIndex
209	logical :: MyLast
210	CHARACTER(len=DA_Namelen) :: loName
211	INTEGER,INTENT(IN),optional :: Client_PeIndex
212
213	loName = ' '
214
215	CALL PMC_G_GetName (clients(ClientId), MyCoupleIndex, loName, MyLast, Client_PeIndex)
216
217	myName = loName
218
219	PMC_S_GetNextArray = .NOT. MyLast ! Return true if valid array
220
221	return
222	END function PMC_S_GetNextArray
223
224	SUBROUTINE PMC_S_Set_DataArray_2d (ClientId, array)
225	IMPLICIT none
226	INTEGER,INTENT(IN) :: ClientId
227	REAL(kind=dp),INTENT(IN),DIMENSION(:,:) :: array
228	!-- local variables
229	INTEGER :: NrDims
230	INTEGER,DIMENSION (4) :: dims
231	INTEGER :: dim_order
232	TYPE(c_ptr) :: array_adr
233
234	dims = 1
235
236	NrDims = 2
237	dims(1) = size(array,1)
238	dims(2) = size(array,2)
239	dim_order = 2
240
241	array_adr = c_loc(array)
242
243	CALL PMC_S_SetArray (ClientId, NrDims, dims, dim_order, array_adr)
244
245	return
246	END SUBROUTINE PMC_S_Set_DataArray_2d
247
248	SUBROUTINE PMC_S_Set_DataArray_3d (ClientId, array, nz_cl, nz)
249	IMPLICIT none
250	INTEGER,INTENT(IN) :: ClientId
251	REAL(kind=dp),INTENT(IN),DIMENSION(:,:,:) :: array
252	INTEGER,INTENT(IN) :: nz_cl
253	INTEGER,INTENT(IN) :: nz
254	!-- local variables
255	INTEGER :: NrDims
256	INTEGER,DIMENSION (4) :: dims
257	INTEGER :: dim_order
258	TYPE(c_ptr) :: array_adr
259
260	dims = 1
261
262	dims = 0
263	NrDims = 3
264	dims(1) = size(array,1)
265	dims(2) = size(array,2)
266	dims(3) = size(array,3)
267	dim_order = 33
268	dims(4) = nz_cl+dims(1)-nz ! works for first dimension 1:nz and 0:nz+1
269
270	array_adr = c_loc(array)
271
272	CALL PMC_S_SetArray (ClientId, NrDims, dims, dim_order, array_adr)
273
274	return
275	END SUBROUTINE PMC_S_Set_DataArray_3d
276
277	SUBROUTINE PMC_S_setInd_and_AllocMem (ClientId)
278	IMPLICIT none
279	INTEGER,INTENT(IN) :: ClientId
280
281	INTEGER :: i, istat, ierr
282	INTEGER :: arlen, myIndex, tag
283	INTEGER :: rCount ! count MPI requests
284	INTEGER(kind=8) :: bufsize ! Size of MPI data Window
285	TYPE(PeDef),POINTER :: aPE
286	TYPE(ArrayDef),POINTER :: ar
287	CHARACTER(len=DA_Namelen) :: myName
288	INTEGER,DIMENSION(1024) :: req
289	Type(c_ptr) :: base_ptr
290	REAL(kind=wp),DIMENSION(:),POINTER :: base_array
291	INTEGER(KIND=MPI_ADDRESS_KIND) :: WinSize
292
293	myIndex = 1
294	rCount = 0
295	bufsize = 8
296
297	! First stride, Compute size and set index
298
299	do i=1,Clients(ClientId)%inter_npes
300	aPE => Clients(ClientId)%PEs(i)
301	tag = 200
302	do while (PMC_S_GetNextArray ( ClientId, myName,i))
303	ar => aPE%Arrays
304	if(ar%dim_order == 2) then
305	arlen = aPE%NrEle; ! 2D
306	else if(ar%dim_order == 33) then
307	arlen = aPE%NrEle * ar%A_dim(4); ! PALM 3D
308	else
309	arlen = -1
310	end if
311	ar%BufIndex = myIndex
312
313	tag = tag+1
314	rCount = rCount+1
315	CALL MPI_Isend (myIndex, 1, MPI_INTEGER, i-1, tag, Clients(ClientId)%inter_comm, req(rCount),ierr)
316
317	if(rCount == 1024) then ! Maximum of 1024 outstanding requests
318	CALL MPI_Waitall (rCount, req, MPI_STATUSES_IGNORE, ierr)
319	rCount = 0;
320	end if
321
322	myIndex = myIndex+arlen
323	bufsize = bufsize+arlen
324	ar%BufSize = arlen
325
326	end do
327	if(rCount > 0) then ! Wait for all send completed
328	CALL MPI_Waitall (rCount, req, MPI_STATUSES_IGNORE, ierr)
329	end if
330	end do
331
332	! Create RMA (One Sided Communication) window for data buffer
333
334	CALL PMC_Alloc_mem (base_array, bufsize, base_ptr)
335	Clients(ClientId)%TotalBufferSize = bufsize*wp !Total buffer size in Byte
336
337	WinSize = bufsize*wp
338	! write(9,*) 'PMC_S_SetInd_and_Mem ',m_model_rank,Clients(ClientId)%inter_npes,WinSize,bufsize
339	CALL MPI_Win_create (base_array, WinSize, wp, MPI_INFO_NULL, Clients(ClientId)%intra_comm, Clients(ClientId)%BufWin, ierr);
340	CALL MPI_Win_fence (0, Clients(ClientId)%BufWin, ierr); ! Open Window to set data
341	CALL MPI_Barrier(Clients(ClientId)%intra_comm, ierr)
342
343	! Second stride, Set Buffer pointer
344
345	do i=1,Clients(ClientId)%inter_npes
346	aPE => Clients(ClientId)%PEs(i)
347	do while (PMC_S_GetNextArray ( ClientId, myName,i))
348	ar => aPE%Arrays
349	ar%SendBuf = c_loc(base_array(ar%BufIndex)) !kk Adressrechnung ueberlegen
350	if(ar%BufIndex+ar%BufSize > bufsize) then
351	write(0,'(a,i4,4i7,1x,a)') 'Buffer too small ',i,ar%BufIndex,ar%BufSize,ar%BufIndex+ar%BufSize,bufsize,trim(myName)
352	CALL MPI_Abort (MPI_COMM_WORLD, istat, ierr)
353	end if
354	end do
355	end do
356
357	return
358	END SUBROUTINE PMC_S_setInd_and_AllocMem
359
360	SUBROUTINE PMC_S_FillBuffer (ClientId, WaitTime)
361	IMPLICIT none
362	INTEGER,INTENT(IN) :: ClientId
363	REAL(kind=dp),INTENT(OUT),optional :: WaitTime
364
365	!-- local variables
366	INTEGER :: ip,ij,istat,ierr
367	INTEGER :: myIndex
368	REAL(kind=dp) :: t1,t2
369	TYPE(PeDef),POINTER :: aPE
370	TYPE(ArrayDef),POINTER :: ar
371	CHARACTER(len=DA_Namelen) :: myName
372	INTEGER,DIMENSION(1) :: buf_shape
373	REAL(kind=wp),POINTER,DIMENSION(:) :: buf
374	REAL(kind=wp),POINTER,DIMENSION(:,:) :: data_2d
375	REAL(kind=wp),POINTER,DIMENSION(:,:,:) :: data_3d
376
377	t1 = PMC_Time()
378	CALL MPI_Barrier(Clients(ClientId)%intra_comm, ierr) ! Wait for buffer empty
379	t2 = PMC_Time()
380	if(present(WaitTime)) WaitTime = t2-t1
381
382	do ip=1,Clients(ClientId)%inter_npes
383	aPE => Clients(ClientId)%PEs(ip)
384	do while (PMC_S_GetNextArray ( ClientId, myName,ip))
385	ar => aPE%Arrays
386	myIndex=1
387	if(ar%dim_order == 2) then
388	buf_shape(1) = aPE%NrEle
389	CALL c_f_pointer(ar%SendBuf, buf, buf_shape)
390	CALL c_f_pointer(ar%data, data_2d, ar%A_dim(1:2))
391	do ij=1,aPE%NrEle
392	buf(myIndex) = data_2d(aPE%locInd(ij)%j,aPE%locInd(ij)%i)
393	myIndex = myIndex+1
394	end do
395	else if(ar%dim_order == 33) then
396	buf_shape(1) = aPE%NrEle*ar%A_dim(4)
397	CALL c_f_pointer(ar%SendBuf, buf, buf_shape)
398	CALL c_f_pointer(ar%data, data_3d, ar%A_dim(1:3))
399	do ij=1,aPE%NrEle
400	buf(myIndex:myIndex+ar%A_dim(4)-1) = data_3d(1:ar%A_dim(4),aPE%locInd(ij)%j,aPE%locInd(ij)%i)
401	myIndex = myIndex+ar%A_dim(4)
402	end do
403	else
404	write(0,*) "Illegal Order of Dimension ",ar%dim_order
405	CALL MPI_Abort (MPI_COMM_WORLD, istat, ierr);
406
407	end if
408	end do
409	end do
410
411	CALL MPI_Barrier(Clients(ClientId)%intra_comm, ierr) ! buffer is full
412
413	return
414	END SUBROUTINE PMC_S_FillBuffer
415
416	SUBROUTINE PMC_S_GetData_from_Buffer (ClientId, WaitTime)
417	IMPLICIT none
418	INTEGER,INTENT(IN) :: ClientId
419	REAL(kind=dp),INTENT(OUT),optional :: WaitTime
420
421	!-- local variables
422	INTEGER :: ip,ij,istat,ierr
423	INTEGER :: myIndex
424	REAL(kind=dp) :: t1,t2
425	TYPE(PeDef),POINTER :: aPE
426	TYPE(ArrayDef),POINTER :: ar
427	CHARACTER(len=DA_Namelen) :: myName
428	INTEGER,DIMENSION(1) :: buf_shape
429	REAL(kind=wp),POINTER,DIMENSION(:) :: buf
430	REAL(kind=wp),POINTER,DIMENSION(:,:) :: data_2d
431	REAL(kind=wp),POINTER,DIMENSION(:,:,:) :: data_3d
432
433	t1 = PMC_Time()
434	CALL MPI_Barrier(Clients(ClientId)%intra_comm, ierr) ! Wait for MPI_Put from client
435	t2 = PMC_Time()
436	if(present(WaitTime)) WaitTime = t2-t1
437
438	do ip=1,Clients(ClientId)%inter_npes
439	aPE => Clients(ClientId)%PEs(ip)
440	do while (PMC_S_GetNextArray ( ClientId, myName,ip))
441	ar => aPE%Arrays
442	myIndex=1
443	if(ar%dim_order == 2) then
444	buf_shape(1) = aPE%NrEle
445	CALL c_f_pointer(ar%SendBuf, buf, buf_shape)
446	CALL c_f_pointer(ar%data, data_2d, ar%A_dim(1:2))
447	do ij=1,aPE%NrEle
448	data_2d(aPE%locInd(ij)%j,aPE%locInd(ij)%i) = buf(myIndex)
449	myIndex = myIndex+1
450	end do
451	else if(ar%dim_order == 33) then
452	buf_shape(1) = aPE%NrEle*ar%A_dim(4)
453	CALL c_f_pointer(ar%SendBuf, buf, buf_shape)
454	CALL c_f_pointer(ar%data, data_3d, ar%A_dim(1:3))
455	do ij=1,aPE%NrEle
456	data_3d(1:ar%A_dim(4),aPE%locInd(ij)%j,aPE%locInd(ij)%i) = buf(myIndex:myIndex+ar%A_dim(4)-1)
457	myIndex = myIndex+ar%A_dim(4)
458	end do
459	else
460	write(0,*) "Illegal Order of Dimension ",ar%dim_order
461	CALL MPI_Abort (MPI_COMM_WORLD, istat, ierr);
462
463	end if
464	end do
465	end do
466
467	CALL MPI_Barrier(Clients(ClientId)%intra_comm, ierr) ! data copy finished, buffer is free for use agein
468
469	return
470	END SUBROUTINE PMC_S_GetData_from_Buffer
471
472	! Private SUBROUTINEs
473
474	SUBROUTINE Get_DA_names_from_client (ClientId)
475	IMPLICIT none
476	INTEGER,INTENT(IN) :: ClientId
477	!-- local variables
478	type(DA_NameDef) :: myName
479
480	! Get Data Array Description and Name from Client
481
482	do
483	CALL PMC_Bcast ( myName%couple_index, 0, comm=m_to_client_comm(ClientId))
484	if(myName%couple_index == -1) EXIT
485	CALL PMC_Bcast ( myName%ServerDesc, 0, comm=m_to_client_comm(ClientId))
486	CALL PMC_Bcast ( myName%NameOnServer, 0, comm=m_to_client_comm(ClientId))
487	CALL PMC_Bcast ( myName%ClientDesc, 0, comm=m_to_client_comm(ClientId))
488	CALL PMC_Bcast ( myName%NameOnClient, 0, comm=m_to_client_comm(ClientId))
489
490	CALL PMC_G_SetName (clients(ClientID), myName%couple_index, myName%NameOnServer )
491	end do
492
493	return
494	END SUBROUTINE Get_DA_names_from_client
495
496	SUBROUTINE PMC_S_SetArray (ClientId, NrDims, dims, dim_order, array_adr)
497	IMPLICIT none
498
499	INTEGER,INTENT(IN) :: ClientId
500	INTEGER,INTENT(IN) :: NrDims
501	INTEGER,INTENT(IN),DIMENSION(:) :: dims
502	INTEGER,INTENT(IN) :: dim_order
503	TYPE(c_ptr),INTENT(IN) :: array_adr
504
505	INTEGER :: i
506	TYPE(PeDef),POINTER :: aPE
507	TYPE(ArrayDef),POINTER :: ar
508	CHARACTER(len=DA_Namelen) :: myName
509
510	! Set Array for Client interPE 0
511
512	do i=1,Clients(ClientId)%inter_npes
513	aPE => Clients(ClientId)%PEs(i)
514	ar => aPE%Arrays
515	ar%NrDims = NrDims
516	ar%A_dim = dims
517	ar%dim_order = dim_order
518	ar%data = array_adr
519	end do
520
521	return
522	END SUBROUTINE PMC_S_SetArray
523
524
525	SUBROUTINE Set_PE_index_list (ClientId, myClient,index_list,NrP)
526	IMPLICIT none
527
528	INTEGER,INTENT(IN) :: ClientId
529	TYPE(ClientDef),INTENT(INOUT) :: myClient
530	INTEGER,INTENT(IN),DIMENSION(:,:) :: index_list
531	INTEGER,INTENT(IN) :: NrP
532
533	!-- local variables
534	INTEGER :: i,j,ind,ierr,i2
535	TYPE(PeDef),POINTER :: aPE
536	INTEGER :: RemPE
537	INTEGER,DIMENSION(myClient%inter_npes) :: RemInd
538	INTEGER,DIMENSION(:),POINTER :: RemIndw
539	INTEGER,DIMENSION(:),POINTER :: RLdef
540	INTEGER(KIND=MPI_ADDRESS_KIND) :: WinSize
541	INTEGER :: indWin,indWin2
542
543	! First, count entries for every remote client PE
544
545	do i=1,myClient%inter_npes
546	aPE => myClient%PEs(i)
547	aPE%NrEle = 0
548	end do
549
550	do j=1,NrP ! loop over number of cells coarse grid
551	RemPE = index_list(5,j)+1 ! Pe number remote PE
552	aPE => myClient%PEs(RemPE)
553	aPE% NrEle = aPE% NrEle+1 ! Increment Number of elements for this client Pe
554	end do
555
556	do i=1,myClient%inter_npes
557	aPE => myClient%PEs(i)
558	ALLOCATE(aPE%locInd(aPE%NrEle))
559	end do
560
561	RemInd = 0
562
563	! Second, Create lists
564
565	do j=1,NrP ! loop over number of cells coarse grid
566	RemPE = index_list(5,j)+1 ! Pe number remote PE
567	aPE => myClient%PEs(RemPE)
568	RemInd(RemPE) = RemInd(RemPE)+1
569	ind = RemInd(RemPE)
570	aPE%locInd(ind)%i = index_list(1,j)
571	aPE%locInd(ind)%j = index_list(2,j)
572	end do
573
574	! Prepare Number of Elements for Client PEs
575	CALL PMC_Alloc_mem (RLdef, myClient%inter_npes*2)
576	WinSize = myClient%inter_npesc_sizeof(i)2 ! Number of Client PEs * size of INTEGER (i just arbitrary INTEGER)
577
578	CALL MPI_Win_create (RLdef, WinSize, iwp, MPI_INFO_NULL, myClient%intra_comm, indWin, ierr);
579	CALL MPI_Win_fence (0, indWin, ierr); ! Open Window to set data
580
581	RLdef(1) = 0 ! Index on Remote PE 0
582	RLdef(2) = RemInd(1) ! Number of Elements on Rem PE 0
583
584	do i=2,myClient%inter_npes ! Reserve Buffer for index array
585	i2 = (i-1)*2+1
586	RLdef(i2) = RLdef(i2-2) + RLdef(i2-1)*2 ! Index on Remote PE
587	RLdef(i2+1) = RemInd(i) ! Number of Elements on Remote PE
588	end do
589
590	CALL MPI_Win_fence (0, indWin, ierr); ! Close Window to allow client to access data
591	CALL MPI_Win_fence (0, indWin, ierr); ! Client has retrieved data
592
593	i2 = 2*myClient%inter_npes-1
594	WinSize = (RLdef(i2)+RLdef(i2+1))*2
595	WinSize = max(WinSize,1) ! Make sure, MPI_Alloc_mem works
596
597	CALL PMC_Alloc_mem (RemIndw, int(WinSize))
598
599	CALL MPI_Barrier (m_model_comm, ierr)
600	CALL MPI_Win_create (RemIndw, WinSize*c_sizeof(i), iwp, MPI_INFO_NULL, myClient%intra_comm, indWin2, ierr);
601
602	CALL MPI_Win_fence (0, indWin2, ierr); ! Open Window to set data
603	do j=1,NrP ! this loop creates the 2D index list
604	RemPE = index_list(5,j)+1 ! Pe number remote PE
605	aPE => myClient%PEs(RemPE)
606	i2 = RemPE*2-1
607	ind = RLdef(i2)+1
608	RemIndw(ind) = index_list(3,j)
609	RemIndw(ind+1) = index_list(4,j)
610	RLdef(i2) = RLdef(i2)+2
611	end do
612	CALL MPI_Win_fence (0, indWin2, ierr); !all data set
613
614	CALL MPI_Barrier(myClient%intra_comm, ierr) ! Dont know why, but this barrier is necessary before we can free the windows
615
616	CALL MPI_Win_free(indWin, ierr)
617	CALL MPI_Win_free(indWin2, ierr)
618
619	! Sollte funktionieren, Problem mit MPI implementation
620	! https://www.lrz.de/services/software/parallel/mpi/onesided
621	! CALL MPI_Free_mem (RemIndw, ierr)
622
623	return
624	END SUBROUTINE Set_PE_index_list
625
626	END MODULE pmc_server

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