src/sched_policies/heteroprio.c: add debug message and display message on error

src/sched_policies/heteroprio.c

@@ -128,6 +128,7 @@ inline void starpu_heteroprio_set_mapping(unsigned sched_ctx_id, enum starpu_het
 	hp->prio_mapping_per_arch_index[arch][source_prio] = dest_bucket_id;
 
 	hp->buckets[dest_bucket_id].valid_archs |= starpu_heteroprio_types_to_arch[arch];
+	_STARPU_DEBUG("Adding arch %d to bucket %d\n", arch, dest_bucket_id);
 }
 
 /** Tell which arch is the faster for the tasks of a bucket (optional) */
@@ -354,7 +355,7 @@ static int push_task_heteroprio_policy(struct starpu_task *task)
 	STARPU_ASSERT(task->priority < STARPU_HETEROPRIO_MAX_PRIO);
 	struct _heteroprio_bucket* bucket = &hp->buckets[task->priority];
 	/* Ensure that any worker that check that list can compute the task */
-	STARPU_ASSERT(bucket->valid_archs);
+	STARPU_ASSERT_MSG(bucket->valid_archs, "The bucket %d does not have any archs\n", task->priority);
 	STARPU_ASSERT(((bucket->valid_archs ^ task->cl->where) & bucket->valid_archs) == 0);
 
 	/* save the task */