The parallel i/o should also not get the DM part mass.

examples/main.c

@@ -856,13 +856,12 @@ int main(int argc, char *argv[]) {
 #if defined(HAVE_HDF5)
 #if defined(WITH_MPI)
 #if defined(HAVE_PARALLEL_HDF5)
-    read_ic_parallel(ICfileName, &us, dim, &parts, &gparts, &sparts, &bparts,
-                     &Ngas, &Ngpart, &Ngpart_background, &Nspart, &Nbpart,
-                     &flag_entropy_ICs, &high_res_DM_mass, with_hydro,
-                     (with_external_gravity || with_self_gravity), with_stars,
-                     with_black_holes, cleanup_h, cleanup_sqrt_a, cosmo.h,
-                     cosmo.a, myrank, nr_nodes, MPI_COMM_WORLD, MPI_INFO_NULL,
-                     nr_threads, dry_run);
+    read_ic_parallel(
+        ICfileName, &us, dim, &parts, &gparts, &sparts, &bparts, &Ngas, &Ngpart,
+        &Ngpart_background, &Nspart, &Nbpart, &flag_entropy_ICs, with_hydro,
+        (with_external_gravity || with_self_gravity), with_stars,
+        with_black_holes, cleanup_h, cleanup_sqrt_a, cosmo.h, cosmo.a, myrank,
+        nr_nodes, MPI_COMM_WORLD, MPI_INFO_NULL, nr_threads, dry_run);
 #else
     read_ic_serial(
         ICfileName, &us, dim, &parts, &gparts, &sparts, &bparts, &Ngas, &Ngpart,

examples/nIFTyCluster/Baryonic/nifty.yml

@@ -49,7 +49,7 @@ Gravity:
   
 # Parameters for the hydrodynamics scheme
 SPH:
-  resolution_eta:        1.48691 # 100 ngb with wendland0-c2
+  resolution_eta:        1.48691  # 100 ngb with wendland0-c2
   h_min_ratio:           0.1      # Minimal smoothing in units of softening.
   CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
   minimal_temperature:   100      # (internal units)

src/parallel_io.c

@@ -706,10 +706,10 @@ void read_ic_parallel(char* fileName, const struct unit_system* internal_units,
                       struct spart** sparts, struct bpart** bparts,
                       size_t* Ngas, size_t* Ngparts, size_t* Ngparts_background,
                       size_t* Nstars, size_t* Nblackholes, int* flag_entropy,
-                      float* gpart_mass, int with_hydro, int with_gravity,
-                      int with_stars, int with_black_holes, int cleanup_h,
-                      int cleanup_sqrt_a, double h, double a, int mpi_rank,
-                      int mpi_size, MPI_Comm comm, MPI_Info info, int n_threads,
+                      int with_hydro, int with_gravity, int with_stars,
+                      int with_black_holes, int cleanup_h, int cleanup_sqrt_a,
+                      double h, double a, int mpi_rank, int mpi_size,
+                      MPI_Comm comm, MPI_Info info, int n_threads,
                       int dry_run) {
 
   hid_t h_file = 0, h_grp = 0;
@@ -981,13 +981,6 @@ void read_ic_parallel(char* fileName, const struct unit_system* internal_units,
     /* Prepare the DM particles */
     io_prepare_dm_gparts(&tp, *gparts, Ndm);
 
-    /* Record the mass of the DM particles */
-    const float local_gpart_mass = (*gparts)[0].mass;
-    float global_gpart_mass;
-    MPI_Allreduce(&local_gpart_mass, &global_gpart_mass, 1, MPI_FLOAT, MPI_MAX,
-                  comm);
-    *gpart_mass = global_gpart_mass;
-
     /* Prepare the DM background particles */
     io_prepare_dm_background_gparts(&tp, *gparts + Ndm, Ndm_background);
 

src/parallel_io.h

@@ -38,11 +38,11 @@ void read_ic_parallel(char* fileName, const struct unit_system* internal_units,
                       struct spart** sparts, struct bpart** bparts,
                       size_t* Ngas, size_t* Ngparts, size_t* Ngparts_background,
                       size_t* Nsparts, size_t* Nbparts, int* flag_entropy,
-                      float* gpart_mass, int with_hydro, int with_gravity,
-                      int with_stars, int with_black_holes, int cleanup_h,
-                      int cleanup_sqrt_a, double h, double a, int mpi_rank,
-                      int mpi_size, MPI_Comm comm, MPI_Info info,
-                      int nr_threads, int dry_run);
+                      int with_hydro, int with_gravity, int with_stars,
+                      int with_black_holes, int cleanup_h, int cleanup_sqrt_a,
+                      double h, double a, int mpi_rank, int mpi_size,
+                      MPI_Comm comm, MPI_Info info, int nr_threads,
+                      int dry_run);
 
 void write_output_parallel(struct engine* e, const char* baseName,
                            const struct unit_system* internal_units,