165 |
|
|
166 |
RETURN |
RETURN |
167 |
END |
END |
168 |
|
CStartOfInterface |
169 |
|
SUBROUTINE GLOBAL_SUM_INT( |
170 |
|
U sumPhi, |
171 |
|
I myThid ) |
172 |
|
C /==========================================================\ |
173 |
|
C | SUBROUTINE GLOBAL_SUM_INT | |
174 |
|
C | o Handle sum for integer data. | |
175 |
|
C |==========================================================| |
176 |
|
C | Perform sum an array of one value per thread and then | |
177 |
|
C | sum result of all the processes. | |
178 |
|
C | Notes | |
179 |
|
C | ===== | |
180 |
|
C | Within a process only one thread does the sum, each | |
181 |
|
C | thread is assumed to have already summed its local data. | |
182 |
|
C | The same thread also does the inter-process sum for | |
183 |
|
C | example with MPI and then writes the result into a shared| |
184 |
|
C | location. All threads wait until the sum is avaiailable. | |
185 |
|
C \==========================================================/ |
186 |
|
IMPLICIT NONE |
187 |
|
|
188 |
|
C === Global data === |
189 |
|
#include "SIZE.h" |
190 |
|
#include "EEPARAMS.h" |
191 |
|
#include "EESUPPORT.h" |
192 |
|
|
193 |
|
C === Routine arguments === |
194 |
|
C sumPhi - Result of sum. |
195 |
|
C myThid - My thread id. |
196 |
|
INTEGER sumPhi |
197 |
|
INTEGER myThid |
198 |
|
CEndOfInterface |
199 |
|
|
200 |
|
C === Local variables === |
201 |
|
C phi - Array to be summed. |
202 |
|
C I - Loop counters |
203 |
|
C mpiRC - MPI return code |
204 |
|
INTEGER phi(lShare8,MAX_NO_THREADS) |
205 |
|
INTEGER I |
206 |
|
INTEGER tmp |
207 |
|
#ifdef ALLOW_USE_MPI |
208 |
|
INTEGER mpiRC |
209 |
|
#endif /* ALLOW_USE_MPI */ |
210 |
|
|
211 |
|
C-- write local sum into array |
212 |
|
phi(1,myThid) = sumPhi |
213 |
|
|
214 |
|
C-- Can not start until everyone is ready |
215 |
|
_BARRIER |
216 |
|
|
217 |
|
C-- Sum within the process first |
218 |
|
_BEGIN_MASTER( myThid ) |
219 |
|
tmp = 0. _d 0 |
220 |
|
DO I=1,nThreads |
221 |
|
tmp = tmp + phi(1,I) |
222 |
|
ENDDO |
223 |
|
sumPhi = tmp |
224 |
|
#ifdef ALLOW_USE_MPI |
225 |
|
#ifndef ALWAYS_USE_MPI |
226 |
|
IF ( usingMPI ) THEN |
227 |
|
#endif |
228 |
|
CALL MPI_Allreduce(tmp,sumPhi,1,MPI_INTEGER,MPI_SUM, |
229 |
|
& MPI_COMM_WORLD,mpiRC) |
230 |
|
#ifndef ALWAYS_USE_MPI |
231 |
|
ENDIF |
232 |
|
#endif |
233 |
|
#endif /* ALLOW_USE_MPI */ |
234 |
|
C-- Write solution to place where all threads can see it |
235 |
|
phi(1,1) = sumPhi |
236 |
|
_END_MASTER( myThid ) |
237 |
|
|
238 |
|
C-- Do not leave until we are sure that the sum is done |
239 |
|
_BARRIER |
240 |
|
|
241 |
|
C-- set result for every process |
242 |
|
sumPhi = phi(1,1) |
243 |
|
|
244 |
|
RETURN |
245 |
|
END |