Changeset 4624 for trunk/NEMOGCM/NEMO/OFF_SRC/nemogcm.F90

Timestamp:

2014-04-28T14:09:03+02:00 (10 years ago)

Author:

acc

Message:

#1305. Fix slow start-up problems on some systems by introducing and using lwm logical to restrict output of merged namelists to the first (or only) processor. lwm is true only on the first processor regardless of ln_ctl. Small changes to all flavours of nemogcm.F90 are also required to write namctl and namcfg after the call to mynode which now opens output.namelist.dyn and writes nammpp.

File:

• trunk/NEMOGCM/NEMO/OFF_SRC/nemogcm.F90 (modified) (4 diffs)

trunk/NEMOGCM/NEMO/OFF_SRC/nemogcm.F90

@@ -155 +155 @@
       CALL ctl_opn( numnam_ref, 'namelist_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
       CALL ctl_opn( numnam_cfg, 'namelist_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
-      CALL ctl_opn( numond, 'output.namelist.dyn', 'UNKNOWN', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. , 1 )
       !
       REWIND( numnam_ref )              ! Namelist namctl in reference namelist : Control prints & Benchmark
@@ -164 +163 @@
       READ  ( numnam_cfg, namctl, IOSTAT = ios, ERR = 902 )
 902   IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in configuration namelist', .TRUE. )
-      WRITE( numond, namctl )
 
       !
@@ -174 +172 @@
       READ  ( numnam_cfg, namcfg, IOSTAT = ios, ERR = 904 )
 904   IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in configuration namelist', .TRUE. )   
-      WRITE( numond, namcfg )
 
       !
       !                             !--------------------------------------------!
       !                             !  set communicator & select the local node  !
+      !                             !  NB: mynode also opens output.namelist.dyn !
+      !                             !      on unit number numond on first proc   !
       !                             !--------------------------------------------!
 #if defined key_iomput
-         CALL  xios_initialize( "nemo",return_comm=ilocal_comm )
+      CALL  xios_initialize( "nemo",return_comm=ilocal_comm )
       narea = mynode( cltxt, numnam_ref, numnam_cfg, numond , nstop, ilocal_comm )   ! Nodes selection
 #else
@@ -190 +189 @@
       narea = narea + 1                       ! mynode return the rank of proc (0 --> jpnij -1 )
 
+      lwm = (narea == 1)                      ! control of output namelists
       lwp = (narea == 1) .OR. ln_ctl          ! control of all listing output print
+
+      IF(lwm) THEN
+         ! write merged namelists from earlier to output namelist now that the
+         ! file has been opened in call to mynode. nammpp has already been
+         ! written in mynode (if lk_mpp_mpi)
+         WRITE( numond, namctl )
+         WRITE( numond, namcfg )
+      ENDIF
 
       ! If dimensions of processor grid weren't specified in the namelist file