enable more correct natoms computation when atoms are lost

src/group.cpp

@@ -754,6 +754,18 @@ void Group::read_restart(FILE *fp)
 // computations on a group of atoms
 // ----------------------------------------------------------------------
 
+/* ----------------------------------------------------------------------
+   count atoms in group all
+------------------------------------------------------------------------- */
+
+bigint Group::count_all()
+{
+  bigint nme = atom->nlocal;
+  bigint nall;
+  MPI_Allreduce(&nme,&nall,1,MPI_LMP_BIGINT,MPI_SUM,world);
+  return nall;
+}
+
 /* ----------------------------------------------------------------------
    count atoms in group
 ------------------------------------------------------------------------- */