Merge branch 'mpi-fixes' into 'master'

Fix various issues with MPI and partitioning

These are two bugs and one feature in the current handling of repartitioning
and MPI tasks.

Extracted from current developments so they do not get lost.

See merge request !436

src/partition.c

@@ -383,9 +383,8 @@ static void pick_metis(struct space *s, int nregions, int *vertexw, int *edgew,
   /* dumpMETISGraph("metis_graph", idx_ncells, one, xadj, adjncy,
    *                weights_v, NULL, weights_e);
    */
-
-  if (METIS_PartGraphKway(&idx_ncells, &one, xadj, adjncy, weights_v, weights_e,
-                          NULL, &idx_nregions, NULL, NULL, options, &objval,
+  if (METIS_PartGraphKway(&idx_ncells, &one, xadj, adjncy, weights_v, NULL,
+                          weights_e, &idx_nregions, NULL, NULL, options, &objval,
                           regionid) != METIS_OK)
     error("Call to METIS_PartGraphKway failed.");
 
@@ -520,11 +519,7 @@ static void repart_edge_metis(int partweights, int bothweights, int nodeID,
     struct task *t = &tasks[j];
 
     /* Skip un-interesting tasks. */
-    if (t->type != task_type_self && t->type != task_type_pair &&
-        t->type != task_type_sub_self && t->type != task_type_sub_self &&
-        t->type != task_type_ghost && t->type != task_type_kick1 &&
-        t->type != task_type_kick2 && t->type != task_type_timestep &&
-        t->type != task_type_drift_part && t->type != task_type_drift_gpart)
+    if (t->cost == 0)
       continue;
 
     /* Get the task weight. */

src/scheduler.c

@@ -1038,6 +1038,12 @@ void scheduler_reweight(struct scheduler *s, int verbose) {
       case task_type_timestep:
         cost = wscale * t->ci->count;
         break;
+      case task_type_send:
+        cost = 10 * wscale * t->ci->count * t->ci->count;
+        break;
+      case task_type_recv:
+        cost = 5 * wscale * t->ci->count * t->ci->count;
+        break;
       default:
         cost = 0;
         break;