Swmr test

Example call mpirun -np 4 build/hdf5_minimal 3 3 314 && h5dump example.h5

hdf5_minimal/hdf5.cpp

@@ -118,6 +118,8 @@ printf("[%d] write start", comm_rank);
                     H5Dclose(dset2);
                     H5Gclose(g);
   printf("[%d] write done", comm_rank);
+  H5Dflush(dset);
+
   // extend
   hsize_t new_size=size;
   for (int k=0; k<num_extends;++k)
@@ -126,21 +128,20 @@ printf("[%d] write start", comm_rank);
     std::vector<int> v2(data_length+inc*comm_rank);
     std::iota(std::begin(v2), std::end(v2),comm_rank*10+(k+1)*100);
 
+  new_size+=size;
+  hid_t  status  = H5Dset_extent(dset, &new_size);
+  fspace = H5Dget_space(dset);
+  hid_t status2 = H5Sselect_hyperslab(fspace, H5S_SELECT_SET,offset2, NULL, dimsext,NULL);
+  mspace = H5Screate_simple(1, dimsext, NULL);
+  status = H5Dwrite(dset, H5T_NATIVE_INT, mspace, fspace, H5P_DEFAULT, dataext);
+  H5Dflush(dset);
 
-    hsize_t dimsext[]={v2.size()};
-    
-    hsize_t offset2[]={new_size+offset};
-    int* dataext = v2.data();
-    new_size+=size;
-    hid_t  status  = H5Dset_extent(dset, &new_size);
-    fspace = H5Dget_space(dset);
-    hid_t status2 = H5Sselect_hyperslab(fspace, H5S_SELECT_SET,offset2, NULL, dimsext,NULL);
-    mspace = H5Screate_simple(1, dimsext, NULL);
-    status = H5Dwrite(dset, H5T_NATIVE_INT, mspace, fspace, H5P_DEFAULT, dataext);
   }
+  H5Dflush(dset);
   // Clean house!
   H5Sclose(mspace) ;
   H5Dclose(dset) ;
+
   H5Sclose(fspace) ;
   H5Fclose(file) ;