only rank 0 reads file for MPI

src/config.f90

@@ -52,14 +52,14 @@ subroutine parse_material()
   inquire(file='material.yaml',exist=fileExists)
   if(.not. fileExists) call IO_error(100,ext_msg='material.yaml')
 
+  if (worldrank == 0) then
     print*, 'reading material.yaml'; flush(IO_STDOUT)
     fileContent = IO_read('material.yaml')
-
-  if (worldrank == 0) then
     call results_openJobFile(parallel=.false.)
     call results_writeDataset_str(fileContent,'setup','material.yaml','DAMASK main configuration')
     call results_closeJobFile
   endif
+  call parallelization_bcast_str(fileContent)
 
   config_material => YAML_parse_str(fileContent)
 
@@ -80,14 +80,14 @@ subroutine parse_numerics()
   inquire(file='numerics.yaml', exist=fileExists)
   if (fileExists) then
 
+    if (worldrank == 0) then
       print*, 'reading numerics.yaml'; flush(IO_STDOUT)
       fileContent = IO_read('numerics.yaml')
-
-    if (worldrank == 0) then
       call results_openJobFile(parallel=.false.)
       call results_writeDataset_str(fileContent,'setup','numerics.yaml','numerics configuration (optional)')
       call results_closeJobFile
     endif
+    call parallelization_bcast_str(fileContent)
 
     config_numerics => YAML_parse_str(fileContent)
 
@@ -110,14 +110,14 @@ subroutine parse_debug()
   inquire(file='debug.yaml', exist=fileExists)
   if (fileExists) then
 
+    if (worldrank == 0) then
       print*, 'reading debug.yaml'; flush(IO_STDOUT)
       fileContent = IO_read('debug.yaml')
-
-    if (worldrank == 0) then
       call results_openJobFile(parallel=.false.)
       call results_writeDataset_str(fileContent,'setup','debug.yaml','debug configuration (optional)')
       call results_closeJobFile
     endif
+    call parallelization_bcast_str(fileContent)
 
     config_debug => YAML_parse_str(fileContent)
 

src/grid/DAMASK_grid.f90

@@ -129,12 +129,14 @@ program DAMASK_grid
   if (stagItMax < 0)    call IO_error(301,ext_msg='maxStaggeredIter')
   if (maxCutBack < 0)   call IO_error(301,ext_msg='maxCutBack')
 
-  fileContent = IO_read(interface_loadFile)
   if (worldrank == 0) then
+    fileContent = IO_read(interface_loadFile)
     call results_openJobFile(parallel=.false.)
     call results_writeDataset_str(fileContent,'setup',interface_loadFile,'load case definition (grid solver)')
     call results_closeJobFile
   endif
+
+  call parallelization_bcast_str(fileContent)
   config_load => YAML_parse_str(fileContent)
   solver => config_load%get('solver')
 

src/parallelization.f90

@@ -24,9 +24,18 @@ module parallelization
     worldrank = 0, &                                                                                !< MPI worldrank (/=0 for MPI simulations only)
     worldsize = 1                                                                                   !< MPI worldsize (/=1 for MPI simulations only)
 
-#ifdef PETSC
+#ifndef PETSC
+public :: parallelization_broadcast_str
+
+contains
+subroutine parallelization_bcast_str(string)
+  character(len=*), allocatable, intent(inout) :: string
+end subroutine parallelization_bcast_str
+
+#else
   public :: &
-    parallelization_init
+    parallelization_init, &
+    parallelization_bcast_str
 
 contains
 
@@ -101,6 +110,27 @@ subroutine parallelization_init
 !$ call omp_set_num_threads(OMP_NUM_THREADS)
 
 end subroutine parallelization_init
+
+
+!--------------------------------------------------------------------------------------------------
+!> @brief Broadcast a string from process 0.
+!--------------------------------------------------------------------------------------------------
+subroutine parallelization_bcast_str(string)
+
+  character(len=:), allocatable, intent(inout) :: string
+
+  integer :: strlen, ierr                                                                           ! pI64 for strlen not supported by MPI
+
+
+  if (worldrank == 0) strlen = len(string,pI64)
+  call MPI_Bcast(strlen,1,MPI_INTEGER,0,MPI_COMM_WORLD, ierr)
+  if (worldrank /= 0) allocate(character(len=strlen)::string)
+
+  call MPI_Bcast(string,strlen,MPI_CHARACTER,0,MPI_COMM_WORLD, ierr)
+
+
+end subroutine parallelization_bcast_str
+
 #endif
 
 end module parallelization