Merge pull request #1556 from lammps/bug-maxexchange

more robust version of atom exchange size

src/irregular.h

@@ -44,6 +44,7 @@ class Irregular : protected Pointers {
   int triclinic;
   int map_style;
 
+  int bufextra;                     // augment send buf size for a migrating atom
   int maxsend,maxrecv;              // size of buf send/recv in # of doubles
   double *buf_send,*buf_recv;       // bufs used in migrate_atoms
   int maxdbuf;                      // size of double buf in bytes
@@ -92,6 +93,7 @@ class Irregular : protected Pointers {
 
   int binary(double, int, double *);
 
+  void init_exchange();             // reset bufxtra
   void grow_send(int,int);          // reallocate send buffer
   void grow_recv(int);              // free/allocate recv buffer
 };