Free stable identifiers listed for deletion.

Also adds some printf debbuging statements for memory usage.

neurodamus/node.py

@@ -37,6 +37,8 @@
 # Internal Plugins
 from . import ngv as _ngv  # NOQA
 
+from neuron import h
+
 
 class METypeEngine(EngineBase):
     CellManagerCls = CellDistributor
@@ -1469,6 +1471,10 @@ def clear_model(self, avoid_creating_objs=False, avoid_clearing_queues=True):
         # Clear BBSaveState
         self._bbss.ignore()
 
+        # There should be no more datahandles to the old model. Hence,
+        # the stable identifiers can be deleted now.
+        h.clear_deferred_deletion_vectors()
+
         # Shrink ArrayPools holding mechanism's data in NEURON
         pool_shrink()
 

neurodamus/utils/memory.py

@@ -73,6 +73,9 @@ def print_mem_usage():
     """
     Print memory usage information across all ranks.
     """
+
+    MPI.pc.print_memory_stats()
+
     usage_mb = get_mem_usage()
 
     min_usage_mb = MPI.pc.allreduce(usage_mb, MPI.MIN)