Remove unnecessary data transfers

src/ecwam/cireduce_loki_gpu.F90

@@ -53,6 +53,7 @@ SUBROUTINE CIREDUCE_LOKI_GPU (WVPRPT, FF_NOW)
 
       USE YOMHOOK  , ONLY : LHOOK,   DR_HOOK, JPHOOK
       USE YOWDRVTYPE ,ONLY: FREQUENCY, FORCING_FIELDS
+      USE YOWSTAT, ONLY: LUPDATE_GPU_GLOBALS
 
 ! ----------------------------------------------------------------------
       IMPLICIT NONE
@@ -93,7 +94,9 @@ SUBROUTINE CIREDUCE_LOKI_GPU (WVPRPT, FF_NOW)
 
         ELSE
 
+IF(LUPDATE_GPU_GLOBALS)THEN
 !$loki update_device
+ENDIF
           CALL GSTATS(1493,0)
 !         DETERMINE THE WAVE ATTENUATION FACTOR
 !$acc parallel loop gang present(FF_NOW, WVPRPT) vector_length(NPROMA_WAM)
@@ -103,7 +106,6 @@ SUBROUTINE CIREDUCE_LOKI_GPU (WVPRPT, FF_NOW)
           ENDDO
 !$acc end parallel loop
           CALL GSTATS(1493,1)
-!$loki update_host
         ENDIF
 
 IF (LHOOK) CALL DR_HOOK('CIREDUCE',1,ZHOOK_HANDLE)

src/ecwam/ctuwupdt.F90

@@ -87,8 +87,6 @@ SUBROUTINE CTUWUPDT (IJS, IJL, NINF, NSUP,                  &
 
 IF (LHOOK) CALL DR_HOOK('CTUWUPDT',0,ZHOOK_HANDLE)
 
-!$acc update device(sinth,costh)
-!$acc update device(COSPH, nang, nfre_red)
 ! DEFINE JXO, JYO, KCR
 IF (LFRSTCTU) THEN
 
@@ -106,7 +104,7 @@ SUBROUTINE CTUWUPDT (IJS, IJL, NINF, NSUP,                  &
   IF (.NOT. ALLOCATED(JYO)) ALLOCATE(JYO(NANG,2))
   IF (.NOT. ALLOCATED(KCR)) ALLOCATE(KCR(NANG,4))
 
-!$acc update device(KLON, KLAT, KCOR, JXO, JYO, KCR, KPM)
+!$acc update device(JXO, JYO, KCR, KPM)
  !$acc kernels
   DO K=1,NANG
 
@@ -197,8 +195,6 @@ SUBROUTINE CTUWUPDT (IJS, IJL, NINF, NSUP,                  &
    NPROMA=(IJL-IJS+1)/MTHREADS + 1
 
 #ifdef _OPENACC
-!$acc update device(WLAT,WCOR)
-!$acc update device(NFRE_RED,ZPI,FR,DELTH,NANG)
 !$acc data present(KLAT,WLAT,KCOR,WCOR,WLATN,WLONN,WCORN)
 #else
 !$OMP   PARALLEL DO SCHEDULE(DYNAMIC,1) PRIVATE(JKGLO, KIJS, KIJL)

src/ecwam/initdpthflds.F90

@@ -87,6 +87,10 @@ SUBROUTINE INITDPTHFLDS(WVENVI, WVPRPT, WVPRPT_LAND)
 
       WVPRPT_LAND%CIWA(:) = 1.0_JWRB
 
+#ifdef WAM_GPU
+      CALL WVPRPT_LAND%SYNC_DEVICE_RDONLY()
+#endif
+
 IF (LHOOK) CALL DR_HOOK('INITDPTHFLDS',1,ZHOOK_HANDLE)
 
 END SUBROUTINE INITDPTHFLDS

src/ecwam/mpdecomp.F90

@@ -1935,6 +1935,8 @@ SUBROUTINE MPDECOMP(NPR, MAXLEN, LLIRANK, LLWVENVI)
 WRITE(IU06,*) ''
 CALL FLUSH(IU06)
 
+!$acc update device(KLON, KLAT, KCOR, WLAT, WCOR)
+
 IF (LHOOK) CALL DR_HOOK('MPDECOMP',1,ZHOOK_HANDLE)
 
 END SUBROUTINE MPDECOMP

src/ecwam/proenvhalo.F90

@@ -89,11 +89,8 @@ SUBROUTINE PROENVHALO (NINF, NSUP,                            &
 !$OMP END PARALLEL DO
 #endif /*_OPENACC*/
 
-!$acc data copyin(WVPRPT_LAND) &
-!$acc copyin(WVPRPT_LAND%WAVNUM,WVPRPT_LAND%CGROUP,WVPRPT_LAND%OMOSNH2KD)
-
       CALL MPEXCHNG(BUFFER_EXT, 3*NFRE_RED+5, 1, 1)
-      !$acc kernels
+      !$acc kernels present(WVPRPT_LAND)
       BUFFER_EXT(NSUP+1,1:NFRE_RED) = WVPRPT_LAND%WAVNUM(1:NFRE_RED)
       BUFFER_EXT(NSUP+1,NFRE_RED+1:2*NFRE_RED) = WVPRPT_LAND%CGROUP(1:NFRE_RED)
       BUFFER_EXT(NSUP+1,2*NFRE_RED+1:3*NFRE_RED) = WVPRPT_LAND%OMOSNH2KD(1:NFRE_RED)
@@ -105,7 +102,6 @@ SUBROUTINE PROENVHALO (NINF, NSUP,                            &
       !$acc end kernels
 
 !$acc end data
-!$acc end data
 
 IF (LHOOK) CALL DR_HOOK('PROENVHALO',1,ZHOOK_HANDLE)
 

src/ecwam/readmdlconf.F90

@@ -142,6 +142,7 @@ SUBROUTINE READMDLCONF (IU07)
       IJS = 1
       IJL = NIBLO
 
+!$acc update device(COSPH)
 
       IF (LHOOK) CALL DR_HOOK('READMDLCONF',1,ZHOOK_HANDLE)
 

src/ecwam/wamintgr_loki_gpu.F90

@@ -40,7 +40,7 @@ SUBROUTINE WAMINTGR_LOKI_GPU(CDTPRA, CDATE, CDATEWH, CDTIMP, CDTIMPNEXT,  &
 USE YOWPARAM , ONLY : NANG, NFRE
 USE YOWPCONS , ONLY : EPSMIN
 USE YOWSTAT  , ONLY : CDTPRO, IDELPRO, IDELT, IDELWI, LLSOURCE, TIME_PROPAG, TIME_PHYS, &
- &  TIME_OFFLOAD
+ &  TIME_OFFLOAD, LUPDATE_GPU_GLOBALS
 USE YOWWIND  , ONLY : CDAWIFL, CDATEWO, CDATEFL
 
 USE YOMHOOK  , ONLY : LHOOK, DR_HOOK, JPHOOK
@@ -92,6 +92,11 @@ SUBROUTINE WAMINTGR_LOKI_GPU(CDTPRA, CDATE, CDATEWH, CDTIMP, CDTIMPNEXT,  &
 !      ----------------
 
 TIME0=-WAM_USER_CLOCK()
+
+IF(LUPDATE_GPU_GLOBALS)THEN
+!$loki update_device
+ENDIF
+
 CALL VARS_4D%SYNC_DEVICE_RDWR()
 CALL BLK2GLO%SYNC_DEVICE_RDONLY()
 CALL FF_NOW%SYNC_DEVICE_RDWR(AIRD=.TRUE., WDWAVE=.TRUE., CICOVER=.TRUE., WSWAVE=.TRUE.,  &
@@ -128,13 +133,6 @@ SUBROUTINE WAMINTGR_LOKI_GPU(CDTPRA, CDATE, CDATEWH, CDTIMP, CDTIMPNEXT,  &
  &           WVPRPT, FF_NOW, FF_NEXT)
 
 
-TIME0=-WAM_USER_CLOCK()
-
-!$loki update_device
-
-
-TIME_OFFLOAD = TIME_OFFLOAD + (TIME0+WAM_USER_CLOCK())*1.E-06
-
 ! IT IS TIME TO INTEGRATE THE SOURCE TERMS
 ! ----------------------------------------
 IF (CDATE >= CDTIMPNEXT) THEN
@@ -211,6 +209,8 @@ SUBROUTINE WAMINTGR_LOKI_GPU(CDTPRA, CDATE, CDATEWH, CDTIMP, CDTIMPNEXT,  &
 
 ENDIF
 
+LUPDATE_GPU_GLOBALS = .FALSE.
+
 TIME0=-WAM_USER_CLOCK()
 CALL WVPRPT%SYNC_HOST_RDWR()
 CALL WVENVI%SYNC_HOST_RDWR()
@@ -222,7 +222,6 @@ SUBROUTINE WAMINTGR_LOKI_GPU(CDTPRA, CDATE, CDATEWH, CDTIMP, CDTIMPNEXT,  &
 CALL MIJ%SYNC_HOST_RDWR()
 CALL BLK2GLO%SYNC_HOST_RDWR()
 
-!$loki update_host
 TIME_OFFLOAD = TIME_OFFLOAD + (TIME0+WAM_USER_CLOCK())*1.E-06
 
 IF (LHOOK) CALL DR_HOOK('WAMINTGR',1,ZHOOK_HANDLE)

src/ecwam/yowparam.F90

@@ -64,6 +64,5 @@ MODULE YOWPARAM
 !                            DONE IN LATITUNAL BANDS
 !                            (like it used to be done).
 ! ----------------------------------------------------------------------
-!$acc declare create( nang )
 !$acc declare create( nfre_red )
       END MODULE YOWPARAM