| 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 |
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