Changeset 622 for palm/trunk/SOURCE/timestep.f90

Timestamp:

Dec 10, 2010 8:08:13 AM (13 years ago)

Author:

raasch

Message:

New:
---

Optional barriers included in order to speed up collective operations
MPI_ALLTOALL and MPI_ALLREDUCE. This feature is controlled with new initial
parameter collective_wait. Default is .FALSE, but .TRUE. on SGI-type
systems. (advec_particles, advec_s_bc, buoyancy, check_for_restart,
cpu_statistics, data_output_2d, data_output_ptseries, flow_statistics,
global_min_max, inflow_turbulence, init_3d_model, init_particles, init_pegrid,
init_slope, parin, pres, poismg, set_particle_attributes, timestep,
read_var_list, user_statistics, write_compressed, write_var_list)

Adjustments for Kyushu Univ. (lcrte, ibmku). Concerning hybrid
(MPI/openMP) runs, the number of openMP threads per MPI tasks can now
be given as an argument to mrun-option -O. (mbuild, mrun, subjob)

Changed:

---

Initialization of the module command changed for SGI-ICE/lcsgi (mbuild, subjob)

Errors:

---

File:

• palm/trunk/SOURCE/timestep.f90 (modified) (4 diffs)

palm/trunk/SOURCE/timestep.f90

@@ -4 +4 @@
 ! Current revisions:
 ! -----------------
-! 
+! optional barriers included in order to speed up collective operations
 !
 ! Former revisions:
@@ -118 +118 @@
           uv_gtrans_l = uv_gtrans_l / REAL( (nxr-nxl+1)*(nyn-nys+1)*(nzt-nzb) )
 #if defined( __parallel )
+          IF ( collective_wait )  CALL MPI_BARRIER( comm2d, ierr )
           CALL MPI_ALLREDUCE( uv_gtrans_l, uv_gtrans, 2, MPI_REAL, MPI_SUM, &
                               comm2d, ierr )
@@ -164 +165 @@
 !$OMP END PARALLEL 
 #if defined( __parallel )
+       IF ( collective_wait )  CALL MPI_BARRIER( comm2d, ierr )
        CALL MPI_ALLREDUCE( dt_diff_l, dt_diff, 1, MPI_REAL, MPI_MIN, comm2d, &
                            ierr )
@@ -252 +254 @@
 !--       Determine the global minumum
 #if defined( __parallel )
+          IF ( collective_wait )  CALL MPI_BARRIER( comm2d, ierr )
           CALL MPI_ALLREDUCE( dt_plant_canopy_l, dt_plant_canopy, 1, MPI_REAL,  &
                               MPI_MIN, comm2d, ierr )