Merge branch release-2016

[alexxy/gromacs.git] / src / gromacs / mdtypes / commrec.h

diff --git a/src/gromacs/mdtypes/commrec.h b/src/gromacs/mdtypes/commrec.h
index 4cfb9e9bb2c768c72e4e81f113a89fc738feb0da..cdbf2b9e235dda703b39c4a4b8a81efcd9da2cf9 100644 (file)
--- a/src/gromacs/mdtypes/commrec.h
+++ b/src/gromacs/mdtypes/commrec.h
@@ -103,11 +103,14 @@ struct t_commrec {
     MPI_Comm mpi_comm_mygroup;         /* subset of mpi_comm_mysim including only
                                           the ranks in the same group (PP or PME) */
 
-    /* MPI ranks within a physical node for hardware access */
-    int            nrank_intranode;    /* nr of ranks on this physical node */
-    int            rank_intranode;     /* our rank on this physical node */
-    int            nrank_pp_intranode; /* as nrank_intranode, for particle-particle only */
-    int            rank_pp_intranode;  /* as rank_intranode, for particle-particle only */
+    /* MPI ranks and a communicator within a physical node for hardware access */
+    MPI_Comm       mpi_comm_physicalnode; /* communicator for all ranks of the physical node
+                                           * NOTE: this communicator should only be used during initialization and finalization, as it can contain ranks from PP, PME and multiple simulations with multisim
+                                           */
+    int            nrank_intranode;       /* nr of ranks on this physical node */
+    int            rank_intranode;        /* our rank on this physical node */
+    int            nrank_pp_intranode;    /* as nrank_intranode, for particle-particle only */
+    int            rank_pp_intranode;     /* as rank_intranode, for particle-particle only */
 
     gmx_nodecomm_t nc;